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==========================
Clang-Format Style Options
==========================
:doc:`ClangFormatStyleOptions` describes configurable formatting style options
supported by :doc:`LibFormat` and :doc:`ClangFormat`.
When using :program:`clang-format` command line utility or
``clang::format::reformat(...)`` functions from code, one can either use one of
the predefined styles (LLVM, Google, Chromium, Mozilla, WebKit, Microsoft) or
create a custom style by configuring specific style options.
Configuring Style with clang-format
===================================
:program:`clang-format` supports two ways to provide custom style options:
directly specify style configuration in the ``-style=`` command line option or
use ``-style=file`` and put style configuration in the ``.clang-format`` or
``_clang-format`` file in the project directory.
When using ``-style=file``, :program:`clang-format` for each input file will
try to find the ``.clang-format`` file located in the closest parent directory
of the input file. When the standard input is used, the search is started from
the current directory.
The ``.clang-format`` file uses YAML format:
.. code-block:: yaml
key1: value1
key2: value2
# A comment.
...
The configuration file can consist of several sections each having different
``Language:`` parameter denoting the programming language this section of the
configuration is targeted at. See the description of the **Language** option
below for the list of supported languages. The first section may have no
language set, it will set the default style options for all languages.
Configuration sections for specific language will override options set in the
default section.
When :program:`clang-format` formats a file, it auto-detects the language using
the file name. When formatting standard input or a file that doesn't have the
extension corresponding to its language, ``-assume-filename=`` option can be
used to override the file name :program:`clang-format` uses to detect the
language.
An example of a configuration file for multiple languages:
.. code-block:: yaml
---
# We'll use defaults from the LLVM style, but with 4 columns indentation.
BasedOnStyle: LLVM
IndentWidth: 4
---
Language: Cpp
# Force pointers to the type for C++.
DerivePointerAlignment: false
PointerAlignment: Left
---
Language: JavaScript
# Use 100 columns for JS.
ColumnLimit: 100
---
Language: Proto
# Don't format .proto files.
DisableFormat: true
---
Language: CSharp
# Use 100 columns for C#.
ColumnLimit: 100
...
An easy way to get a valid ``.clang-format`` file containing all configuration
options of a certain predefined style is:
.. code-block:: console
clang-format -style=llvm -dump-config > .clang-format
When specifying configuration in the ``-style=`` option, the same configuration
is applied for all input files. The format of the configuration is:
.. code-block:: console
-style='{key1: value1, key2: value2, ...}'
Disabling Formatting on a Piece of Code
=======================================
Clang-format understands also special comments that switch formatting in a
delimited range. The code between a comment ``// clang-format off`` or
``/* clang-format off */`` up to a comment ``// clang-format on`` or
``/* clang-format on */`` will not be formatted. The comments themselves
will be formatted (aligned) normally.
.. code-block:: c++
int formatted_code;
// clang-format off
void unformatted_code ;
// clang-format on
void formatted_code_again;
Configuring Style in Code
=========================
When using ``clang::format::reformat(...)`` functions, the format is specified
by supplying the `clang::format::FormatStyle
<https://clang.llvm.org/doxygen/structclang_1_1format_1_1FormatStyle.html>`_
structure.
Configurable Format Style Options
=================================
This section lists the supported style options. Value type is specified for
each option. For enumeration types possible values are specified both as a C++
enumeration member (with a prefix, e.g. ``LS_Auto``), and as a value usable in
the configuration (without a prefix: ``Auto``).
**BasedOnStyle** (``string``)
The style used for all options not specifically set in the configuration.
This option is supported only in the :program:`clang-format` configuration
(both within ``-style='{...}'`` and the ``.clang-format`` file).
Possible values:
* ``LLVM``
A style complying with the `LLVM coding standards
<https://llvm.org/docs/CodingStandards.html>`_
* ``Google``
A style complying with `Google's C++ style guide
<https://google.github.io/styleguide/cppguide.html>`_
* ``Chromium``
A style complying with `Chromium's style guide
<https://chromium.googlesource.com/chromium/src/+/master/styleguide/styleguide.md>`_
* ``Mozilla``
A style complying with `Mozilla's style guide
<https://developer.mozilla.org/en-US/docs/Developer_Guide/Coding_Style>`_
* ``WebKit``
A style complying with `WebKit's style guide
<https://www.webkit.org/coding/coding-style.html>`_
* ``Microsoft``
A style complying with `Microsoft's style guide
<https://docs.microsoft.com/en-us/visualstudio/ide/editorconfig-code-style-settings-reference?view=vs-2017>`_
* ``GNU``
A style complying with the `GNU coding standards
<https://www.gnu.org/prep/standards/standards.html>`_
* ``InheritParentConfig``
Not a real style, but allows to use the ``.clang-format`` file from the
parent directory (or its parent if there is none). If there is no parent
file found it falls back to the ``fallback`` style, and applies the changes
to that.
With this option you can overwrite some parts of your main style for your
subdirectories. This is also possible through the command line, e.g.:
``--style={BasedOnStyle: InheritParentConfig, ColumnLimit: 20}``
.. START_FORMAT_STYLE_OPTIONS
**AccessModifierOffset** (``int``)
The extra indent or outdent of access modifiers, e.g. ``public:``.
**AlignAfterOpenBracket** (``BracketAlignmentStyle``)
If ``true``, horizontally aligns arguments after an open bracket.
This applies to round brackets (parentheses), angle brackets and square
brackets.
Possible values:
* ``BAS_Align`` (in configuration: ``Align``)
Align parameters on the open bracket, e.g.:
.. code-block:: c++
someLongFunction(argument1,
argument2);
* ``BAS_DontAlign`` (in configuration: ``DontAlign``)
Don't align, instead use ``ContinuationIndentWidth``, e.g.:
.. code-block:: c++
someLongFunction(argument1,
argument2);
* ``BAS_AlwaysBreak`` (in configuration: ``AlwaysBreak``)
Always break after an open bracket, if the parameters don't fit
on a single line, e.g.:
.. code-block:: c++
someLongFunction(
argument1, argument2);
**AlignArrayOfStructures** (``ArrayInitializerAlignmentStyle``)
if not ``None``, when using initialization for an array of structs
aligns the fields into columns.
Possible values:
* ``AIAS_Left`` (in configuration: ``Left``)
Align array column and left justify the columns e.g.:
.. code-block:: c++
struct test demo[] =
{
{56, 23, "hello"},
{-1, 93463, "world"},
{7, 5, "!!" }
};
* ``AIAS_Right`` (in configuration: ``Right``)
Align array column and right justify the columns e.g.:
.. code-block:: c++
struct test demo[] =
{
{56, 23, "hello"},
{-1, 93463, "world"},
{ 7, 5, "!!"}
};
* ``AIAS_None`` (in configuration: ``None``)
Don't align array initializer columns.
**AlignConsecutiveAssignments** (``AlignConsecutiveStyle``)
Style of aligning consecutive assignments.
``Consecutive`` will result in formattings like:
.. code-block:: c++
int a = 1;
int somelongname = 2;
double c = 3;
Possible values:
* ``ACS_None`` (in configuration: ``None``)
Do not align assignments on consecutive lines.
* ``ACS_Consecutive`` (in configuration: ``Consecutive``)
Align assignments on consecutive lines. This will result in
formattings like:
.. code-block:: c++
int a = 1;
int somelongname = 2;
double c = 3;
int d = 3;
/* A comment. */
double e = 4;
* ``ACS_AcrossEmptyLines`` (in configuration: ``AcrossEmptyLines``)
Same as ACS_Consecutive, but also spans over empty lines, e.g.
.. code-block:: c++
int a = 1;
int somelongname = 2;
double c = 3;
int d = 3;
/* A comment. */
double e = 4;
* ``ACS_AcrossComments`` (in configuration: ``AcrossComments``)
Same as ACS_Consecutive, but also spans over lines only containing
comments, e.g.
.. code-block:: c++
int a = 1;
int somelongname = 2;
double c = 3;
int d = 3;
/* A comment. */
double e = 4;
* ``ACS_AcrossEmptyLinesAndComments``
(in configuration: ``AcrossEmptyLinesAndComments``)
Same as ACS_Consecutive, but also spans over lines only containing
comments and empty lines, e.g.
.. code-block:: c++
int a = 1;
int somelongname = 2;
double c = 3;
int d = 3;
/* A comment. */
double e = 4;
**AlignConsecutiveBitFields** (``AlignConsecutiveStyle``)
Style of aligning consecutive bit field.
``Consecutive`` will align the bitfield separators of consecutive lines.
This will result in formattings like:
.. code-block:: c++
int aaaa : 1;
int b : 12;
int ccc : 8;
Possible values:
* ``ACS_None`` (in configuration: ``None``)
Do not align bit fields on consecutive lines.
* ``ACS_Consecutive`` (in configuration: ``Consecutive``)
Align bit fields on consecutive lines. This will result in
formattings like:
.. code-block:: c++
int aaaa : 1;
int b : 12;
int ccc : 8;
int d : 2;
/* A comment. */
int ee : 3;
* ``ACS_AcrossEmptyLines`` (in configuration: ``AcrossEmptyLines``)
Same as ACS_Consecutive, but also spans over empty lines, e.g.
.. code-block:: c++
int aaaa : 1;
int b : 12;
int ccc : 8;
int d : 2;
/* A comment. */
int ee : 3;
* ``ACS_AcrossComments`` (in configuration: ``AcrossComments``)
Same as ACS_Consecutive, but also spans over lines only containing
comments, e.g.
.. code-block:: c++
int aaaa : 1;
int b : 12;
int ccc : 8;
int d : 2;
/* A comment. */
int ee : 3;
* ``ACS_AcrossEmptyLinesAndComments``
(in configuration: ``AcrossEmptyLinesAndComments``)
Same as ACS_Consecutive, but also spans over lines only containing
comments and empty lines, e.g.
.. code-block:: c++
int aaaa : 1;
int b : 12;
int ccc : 8;
int d : 2;
/* A comment. */
int ee : 3;
**AlignConsecutiveDeclarations** (``AlignConsecutiveStyle``)
Style of aligning consecutive declarations.
``Consecutive`` will align the declaration names of consecutive lines.
This will result in formattings like:
.. code-block:: c++
int aaaa = 12;
float b = 23;
std::string ccc;
Possible values:
* ``ACS_None`` (in configuration: ``None``)
Do not align bit declarations on consecutive lines.
* ``ACS_Consecutive`` (in configuration: ``Consecutive``)
Align declarations on consecutive lines. This will result in
formattings like:
.. code-block:: c++
int aaaa = 12;
float b = 23;
std::string ccc;
int a = 42;
/* A comment. */
bool c = false;
* ``ACS_AcrossEmptyLines`` (in configuration: ``AcrossEmptyLines``)
Same as ACS_Consecutive, but also spans over empty lines, e.g.
.. code-block:: c++
int aaaa = 12;
float b = 23;
std::string ccc;
int a = 42;
/* A comment. */
bool c = false;
* ``ACS_AcrossComments`` (in configuration: ``AcrossComments``)
Same as ACS_Consecutive, but also spans over lines only containing
comments, e.g.
.. code-block:: c++
int aaaa = 12;
float b = 23;
std::string ccc;
int a = 42;
/* A comment. */
bool c = false;
* ``ACS_AcrossEmptyLinesAndComments``
(in configuration: ``AcrossEmptyLinesAndComments``)
Same as ACS_Consecutive, but also spans over lines only containing
comments and empty lines, e.g.
.. code-block:: c++
int aaaa = 12;
float b = 23;
std::string ccc;
int a = 42;
/* A comment. */
bool c = false;
**AlignConsecutiveMacros** (``AlignConsecutiveStyle``)
Style of aligning consecutive macro definitions.
``Consecutive`` will result in formattings like:
.. code-block:: c++
#define SHORT_NAME 42
#define LONGER_NAME 0x007f
#define EVEN_LONGER_NAME (2)
#define foo(x) (x * x)
#define bar(y, z) (y + z)
Possible values:
* ``ACS_None`` (in configuration: ``None``)
Do not align macro definitions on consecutive lines.
* ``ACS_Consecutive`` (in configuration: ``Consecutive``)
Align macro definitions on consecutive lines. This will result in
formattings like:
.. code-block:: c++
#define SHORT_NAME 42
#define LONGER_NAME 0x007f
#define EVEN_LONGER_NAME (2)
#define foo(x) (x * x)
/* some comment */
#define bar(y, z) (y + z)
* ``ACS_AcrossEmptyLines`` (in configuration: ``AcrossEmptyLines``)
Same as ACS_Consecutive, but also spans over empty lines, e.g.
.. code-block:: c++
#define SHORT_NAME 42
#define LONGER_NAME 0x007f
#define EVEN_LONGER_NAME (2)
#define foo(x) (x * x)
/* some comment */
#define bar(y, z) (y + z)
* ``ACS_AcrossComments`` (in configuration: ``AcrossComments``)
Same as ACS_Consecutive, but also spans over lines only containing
comments, e.g.
.. code-block:: c++
#define SHORT_NAME 42
#define LONGER_NAME 0x007f
#define EVEN_LONGER_NAME (2)
#define foo(x) (x * x)
/* some comment */
#define bar(y, z) (y + z)
* ``ACS_AcrossEmptyLinesAndComments``
(in configuration: ``AcrossEmptyLinesAndComments``)
Same as ACS_Consecutive, but also spans over lines only containing
comments and empty lines, e.g.
.. code-block:: c++
#define SHORT_NAME 42
#define LONGER_NAME 0x007f
#define EVEN_LONGER_NAME (2)
#define foo(x) (x * x)
/* some comment */
#define bar(y, z) (y + z)
**AlignEscapedNewlines** (``EscapedNewlineAlignmentStyle``)
Options for aligning backslashes in escaped newlines.
Possible values:
* ``ENAS_DontAlign`` (in configuration: ``DontAlign``)
Don't align escaped newlines.
.. code-block:: c++
#define A \
int aaaa; \
int b; \
int dddddddddd;
* ``ENAS_Left`` (in configuration: ``Left``)
Align escaped newlines as far left as possible.
.. code-block:: c++
true:
#define A \
int aaaa; \
int b; \
int dddddddddd;
false:
* ``ENAS_Right`` (in configuration: ``Right``)
Align escaped newlines in the right-most column.
.. code-block:: c++
#define A \
int aaaa; \
int b; \
int dddddddddd;
**AlignOperands** (``OperandAlignmentStyle``)
If ``true``, horizontally align operands of binary and ternary
expressions.
Possible values:
* ``OAS_DontAlign`` (in configuration: ``DontAlign``)
Do not align operands of binary and ternary expressions.
The wrapped lines are indented ``ContinuationIndentWidth`` spaces from
the start of the line.
* ``OAS_Align`` (in configuration: ``Align``)
Horizontally align operands of binary and ternary expressions.
Specifically, this aligns operands of a single expression that needs
to be split over multiple lines, e.g.:
.. code-block:: c++
int aaa = bbbbbbbbbbbbbbb +
ccccccccccccccc;
When ``BreakBeforeBinaryOperators`` is set, the wrapped operator is
aligned with the operand on the first line.
.. code-block:: c++
int aaa = bbbbbbbbbbbbbbb
+ ccccccccccccccc;
* ``OAS_AlignAfterOperator`` (in configuration: ``AlignAfterOperator``)
Horizontally align operands of binary and ternary expressions.
This is similar to ``AO_Align``, except when
``BreakBeforeBinaryOperators`` is set, the operator is un-indented so
that the wrapped operand is aligned with the operand on the first line.
.. code-block:: c++
int aaa = bbbbbbbbbbbbbbb
+ ccccccccccccccc;
**AlignTrailingComments** (``bool``)
If ``true``, aligns trailing comments.
.. code-block:: c++
true: false:
int a; // My comment a vs. int a; // My comment a
int b = 2; // comment b int b = 2; // comment about b
**AllowAllArgumentsOnNextLine** (``bool``)
If a function call or braced initializer list doesn't fit on a
line, allow putting all arguments onto the next line, even if
``BinPackArguments`` is ``false``.
.. code-block:: c++
true:
callFunction(
a, b, c, d);
false:
callFunction(a,
b,
c,
d);
**AllowAllConstructorInitializersOnNextLine** (``bool``)
If a constructor definition with a member initializer list doesn't
fit on a single line, allow putting all member initializers onto the next
line, if ```ConstructorInitializerAllOnOneLineOrOnePerLine``` is true.
Note that this parameter has no effect if
```ConstructorInitializerAllOnOneLineOrOnePerLine``` is false.
.. code-block:: c++
true:
MyClass::MyClass() :
member0(0), member1(2) {}
false:
MyClass::MyClass() :
member0(0),
member1(2) {}
**AllowAllParametersOfDeclarationOnNextLine** (``bool``)
If the function declaration doesn't fit on a line,
allow putting all parameters of a function declaration onto
the next line even if ``BinPackParameters`` is ``false``.
.. code-block:: c++
true:
void myFunction(
int a, int b, int c, int d, int e);
false:
void myFunction(int a,
int b,
int c,
int d,
int e);
**AllowShortBlocksOnASingleLine** (``ShortBlockStyle``)
Dependent on the value, ``while (true) { continue; }`` can be put on a
single line.
Possible values:
* ``SBS_Never`` (in configuration: ``Never``)
Never merge blocks into a single line.
.. code-block:: c++
while (true) {
}
while (true) {
continue;
}
* ``SBS_Empty`` (in configuration: ``Empty``)
Only merge empty blocks.
.. code-block:: c++
while (true) {}
while (true) {
continue;
}
* ``SBS_Always`` (in configuration: ``Always``)
Always merge short blocks into a single line.
.. code-block:: c++
while (true) {}
while (true) { continue; }
**AllowShortCaseLabelsOnASingleLine** (``bool``)
If ``true``, short case labels will be contracted to a single line.
.. code-block:: c++
true: false:
switch (a) { vs. switch (a) {
case 1: x = 1; break; case 1:
case 2: return; x = 1;
} break;
case 2:
return;
}
**AllowShortEnumsOnASingleLine** (``bool``)
Allow short enums on a single line.
.. code-block:: c++
true:
enum { A, B } myEnum;
false:
enum
{
A,
B
} myEnum;
**AllowShortFunctionsOnASingleLine** (``ShortFunctionStyle``)
Dependent on the value, ``int f() { return 0; }`` can be put on a
single line.
Possible values:
* ``SFS_None`` (in configuration: ``None``)
Never merge functions into a single line.
* ``SFS_InlineOnly`` (in configuration: ``InlineOnly``)
Only merge functions defined inside a class. Same as "inline",
except it does not implies "empty": i.e. top level empty functions
are not merged either.
.. code-block:: c++
class Foo {
void f() { foo(); }
};
void f() {
foo();
}
void f() {
}
* ``SFS_Empty`` (in configuration: ``Empty``)
Only merge empty functions.
.. code-block:: c++
void f() {}
void f2() {
bar2();
}
* ``SFS_Inline`` (in configuration: ``Inline``)
Only merge functions defined inside a class. Implies "empty".
.. code-block:: c++
class Foo {
void f() { foo(); }
};
void f() {
foo();
}
void f() {}
* ``SFS_All`` (in configuration: ``All``)
Merge all functions fitting on a single line.
.. code-block:: c++
class Foo {
void f() { foo(); }
};
void f() { bar(); }
**AllowShortIfStatementsOnASingleLine** (``ShortIfStyle``)
Dependent on the value, ``if (a) return;`` can be put on a single line.
Possible values:
* ``SIS_Never`` (in configuration: ``Never``)
Never put short ifs on the same line.
.. code-block:: c++
if (a)
return;
if (b)
return;
else
return;
if (c)
return;
else {
return;
}
* ``SIS_WithoutElse`` (in configuration: ``WithoutElse``)
Put short ifs on the same line only if there is no else statement.
.. code-block:: c++
if (a) return;
if (b)
return;
else
return;
if (c)
return;
else {
return;
}
* ``SIS_OnlyFirstIf`` (in configuration: ``OnlyFirstIf``)
Put short ifs, but not else ifs nor else statements, on the same line.
.. code-block:: c++
if (a) return;
if (b) return;
else if (b)
return;
else
return;
if (c) return;
else {
return;
}
* ``SIS_AllIfsAndElse`` (in configuration: ``AllIfsAndElse``)
Always put short ifs, else ifs and else statements on the same
line.
.. code-block:: c++
if (a) return;
if (b) return;
else return;
if (c) return;
else {
return;
}
**AllowShortLambdasOnASingleLine** (``ShortLambdaStyle``)
Dependent on the value, ``auto lambda []() { return 0; }`` can be put on a
single line.
Possible values:
* ``SLS_None`` (in configuration: ``None``)
Never merge lambdas into a single line.
* ``SLS_Empty`` (in configuration: ``Empty``)
Only merge empty lambdas.
.. code-block:: c++
auto lambda = [](int a) {}
auto lambda2 = [](int a) {
return a;
};
* ``SLS_Inline`` (in configuration: ``Inline``)
Merge lambda into a single line if argument of a function.
.. code-block:: c++
auto lambda = [](int a) {
return a;
};
sort(a.begin(), a.end(), ()[] { return x < y; })
* ``SLS_All`` (in configuration: ``All``)
Merge all lambdas fitting on a single line.
.. code-block:: c++
auto lambda = [](int a) {}
auto lambda2 = [](int a) { return a; };
**AllowShortLoopsOnASingleLine** (``bool``)
If ``true``, ``while (true) continue;`` can be put on a single
line.
**AlwaysBreakAfterDefinitionReturnType** (``DefinitionReturnTypeBreakingStyle``)
The function definition return type breaking style to use. This
option is **deprecated** and is retained for backwards compatibility.
Possible values:
* ``DRTBS_None`` (in configuration: ``None``)
Break after return type automatically.
``PenaltyReturnTypeOnItsOwnLine`` is taken into account.
* ``DRTBS_All`` (in configuration: ``All``)
Always break after the return type.
* ``DRTBS_TopLevel`` (in configuration: ``TopLevel``)
Always break after the return types of top-level functions.
**AlwaysBreakAfterReturnType** (``ReturnTypeBreakingStyle``)
The function declaration return type breaking style to use.
Possible values:
* ``RTBS_None`` (in configuration: ``None``)
Break after return type automatically.
``PenaltyReturnTypeOnItsOwnLine`` is taken into account.
.. code-block:: c++
class A {
int f() { return 0; };
};
int f();
int f() { return 1; }
* ``RTBS_All`` (in configuration: ``All``)
Always break after the return type.
.. code-block:: c++
class A {
int
f() {
return 0;
};
};
int
f();
int
f() {
return 1;
}
* ``RTBS_TopLevel`` (in configuration: ``TopLevel``)
Always break after the return types of top-level functions.
.. code-block:: c++
class A {
int f() { return 0; };
};
int
f();
int
f() {
return 1;
}
* ``RTBS_AllDefinitions`` (in configuration: ``AllDefinitions``)
Always break after the return type of function definitions.
.. code-block:: c++
class A {
int
f() {
return 0;
};
};
int f();
int
f() {
return 1;
}
* ``RTBS_TopLevelDefinitions`` (in configuration: ``TopLevelDefinitions``)
Always break after the return type of top-level definitions.
.. code-block:: c++
class A {
int f() { return 0; };
};
int f();
int
f() {
return 1;
}
**AlwaysBreakBeforeMultilineStrings** (``bool``)
If ``true``, always break before multiline string literals.
This flag is mean to make cases where there are multiple multiline strings
in a file look more consistent. Thus, it will only take effect if wrapping
the string at that point leads to it being indented
``ContinuationIndentWidth`` spaces from the start of the line.
.. code-block:: c++
true: false:
aaaa = vs. aaaa = "bbbb"
"bbbb" "cccc";
"cccc";
**AlwaysBreakTemplateDeclarations** (``BreakTemplateDeclarationsStyle``)
The template declaration breaking style to use.
Possible values:
* ``BTDS_No`` (in configuration: ``No``)
Do not force break before declaration.
``PenaltyBreakTemplateDeclaration`` is taken into account.
.. code-block:: c++
template <typename T> T foo() {
}
template <typename T> T foo(int aaaaaaaaaaaaaaaaaaaaa,
int bbbbbbbbbbbbbbbbbbbbb) {
}
* ``BTDS_MultiLine`` (in configuration: ``MultiLine``)
Force break after template declaration only when the following
declaration spans multiple lines.
.. code-block:: c++
template <typename T> T foo() {
}
template <typename T>
T foo(int aaaaaaaaaaaaaaaaaaaaa,
int bbbbbbbbbbbbbbbbbbbbb) {
}
* ``BTDS_Yes`` (in configuration: ``Yes``)
Always break after template declaration.
.. code-block:: c++
template <typename T>
T foo() {
}
template <typename T>
T foo(int aaaaaaaaaaaaaaaaaaaaa,
int bbbbbbbbbbbbbbbbbbbbb) {
}
**AttributeMacros** (``std::vector<std::string>``)
A vector of strings that should be interpreted as attributes/qualifiers
instead of identifiers. This can be useful for language extensions or
static analyzer annotations.
For example:
.. code-block:: c++
x = (char *__capability)&y;
int function(void) __ununsed;
void only_writes_to_buffer(char *__output buffer);
In the .clang-format configuration file, this can be configured like:
.. code-block:: yaml
AttributeMacros: ['__capability', '__output', '__ununsed']
**BinPackArguments** (``bool``)
If ``false``, a function call's arguments will either be all on the
same line or will have one line each.
.. code-block:: c++
true:
void f() {
f(aaaaaaaaaaaaaaaaaaaa, aaaaaaaaaaaaaaaaaaaa,
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa);
}
false:
void f() {
f(aaaaaaaaaaaaaaaaaaaa,
aaaaaaaaaaaaaaaaaaaa,
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa);
}
**BinPackParameters** (``bool``)
If ``false``, a function declaration's or function definition's
parameters will either all be on the same line or will have one line each.
.. code-block:: c++
true:
void f(int aaaaaaaaaaaaaaaaaaaa, int aaaaaaaaaaaaaaaaaaaa,
int aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa) {}
false:
void f(int aaaaaaaaaaaaaaaaaaaa,
int aaaaaaaaaaaaaaaaaaaa,
int aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa) {}
**BitFieldColonSpacing** (``BitFieldColonSpacingStyle``)
The BitFieldColonSpacingStyle to use for bitfields.
Possible values:
* ``BFCS_Both`` (in configuration: ``Both``)
Add one space on each side of the ``:``
.. code-block:: c++
unsigned bf : 2;
* ``BFCS_None`` (in configuration: ``None``)
Add no space around the ``:`` (except when needed for
``AlignConsecutiveBitFields``).
.. code-block:: c++
unsigned bf:2;
* ``BFCS_Before`` (in configuration: ``Before``)
Add space before the ``:`` only
.. code-block:: c++
unsigned bf :2;
* ``BFCS_After`` (in configuration: ``After``)
Add space after the ``:`` only (space may be added before if
needed for ``AlignConsecutiveBitFields``).
.. code-block:: c++
unsigned bf: 2;
**BraceWrapping** (``BraceWrappingFlags``)
Control of individual brace wrapping cases.
If ``BreakBeforeBraces`` is set to ``BS_Custom``, use this to specify how
each individual brace case should be handled. Otherwise, this is ignored.
.. code-block:: yaml
# Example of usage:
BreakBeforeBraces: Custom
BraceWrapping:
AfterEnum: true
AfterStruct: false
SplitEmptyFunction: false
Nested configuration flags:
* ``bool AfterCaseLabel`` Wrap case labels.
.. code-block:: c++
false: true:
switch (foo) { vs. switch (foo) {
case 1: { case 1:
bar(); {
break; bar();
} break;
default: { }
plop(); default:
} {
} plop();
}
}
* ``bool AfterClass`` Wrap class definitions.
.. code-block:: c++
true:
class foo {};
false:
class foo
{};
* ``BraceWrappingAfterControlStatementStyle AfterControlStatement``
Wrap control statements (``if``/``for``/``while``/``switch``/..).
Possible values:
* ``BWACS_Never`` (in configuration: ``Never``)
Never wrap braces after a control statement.
.. code-block:: c++
if (foo()) {
} else {
}
for (int i = 0; i < 10; ++i) {
}
* ``BWACS_MultiLine`` (in configuration: ``MultiLine``)
Only wrap braces after a multi-line control statement.
.. code-block:: c++
if (foo && bar &&
baz)
{
quux();
}
while (foo || bar) {
}
* ``BWACS_Always`` (in configuration: ``Always``)
Always wrap braces after a control statement.
.. code-block:: c++
if (foo())
{
} else
{}
for (int i = 0; i < 10; ++i)
{}
* ``bool AfterEnum`` Wrap enum definitions.
.. code-block:: c++
true:
enum X : int
{
B
};
false:
enum X : int { B };
* ``bool AfterFunction`` Wrap function definitions.
.. code-block:: c++
true:
void foo()
{
bar();
bar2();
}
false:
void foo() {
bar();
bar2();
}
* ``bool AfterNamespace`` Wrap namespace definitions.
.. code-block:: c++
true:
namespace
{
int foo();
int bar();
}
false:
namespace {
int foo();
int bar();
}
* ``bool AfterObjCDeclaration`` Wrap ObjC definitions (interfaces, implementations...).
@autoreleasepool and @synchronized blocks are wrapped
according to `AfterControlStatement` flag.
* ``bool AfterStruct`` Wrap struct definitions.
.. code-block:: c++
true:
struct foo
{
int x;
};
false:
struct foo {
int x;
};
* ``bool AfterUnion`` Wrap union definitions.
.. code-block:: c++
true:
union foo
{
int x;
}
false:
union foo {
int x;
}
* ``bool AfterExternBlock`` Wrap extern blocks.
.. code-block:: c++
true:
extern "C"
{
int foo();
}
false:
extern "C" {
int foo();
}
* ``bool BeforeCatch`` Wrap before ``catch``.
.. code-block:: c++
true:
try {
foo();
}
catch () {
}
false:
try {
foo();
} catch () {
}
* ``bool BeforeElse`` Wrap before ``else``.
.. code-block:: c++
true:
if (foo()) {
}
else {
}
false:
if (foo()) {
} else {
}
* ``bool BeforeLambdaBody`` Wrap lambda block.
.. code-block:: c++
true:
connect(
[]()
{
foo();
bar();
});
false:
connect([]() {
foo();
bar();
});
* ``bool BeforeWhile`` Wrap before ``while``.
.. code-block:: c++
true:
do {
foo();
}
while (1);
false:
do {
foo();
} while (1);
* ``bool IndentBraces`` Indent the wrapped braces themselves.
* ``bool SplitEmptyFunction`` If ``false``, empty function body can be put on a single line.
This option is used only if the opening brace of the function has
already been wrapped, i.e. the `AfterFunction` brace wrapping mode is
set, and the function could/should not be put on a single line (as per
`AllowShortFunctionsOnASingleLine` and constructor formatting options).
.. code-block:: c++
int f() vs. int f()
{} {
}
* ``bool SplitEmptyRecord`` If ``false``, empty record (e.g. class, struct or union) body
can be put on a single line. This option is used only if the opening
brace of the record has already been wrapped, i.e. the `AfterClass`
(for classes) brace wrapping mode is set.
.. code-block:: c++
class Foo vs. class Foo
{} {
}
* ``bool SplitEmptyNamespace`` If ``false``, empty namespace body can be put on a single line.
This option is used only if the opening brace of the namespace has
already been wrapped, i.e. the `AfterNamespace` brace wrapping mode is
set.
.. code-block:: c++
namespace Foo vs. namespace Foo
{} {
}
**BreakAfterJavaFieldAnnotations** (``bool``)
Break after each annotation on a field in Java files.
.. code-block:: java
true: false:
@Partial vs. @Partial @Mock DataLoad loader;
@Mock
DataLoad loader;
**BreakBeforeBinaryOperators** (``BinaryOperatorStyle``)
The way to wrap binary operators.
Possible values:
* ``BOS_None`` (in configuration: ``None``)
Break after operators.
.. code-block:: c++
LooooooooooongType loooooooooooooooooooooongVariable =
someLooooooooooooooooongFunction();
bool value = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa +
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa ==
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa &&
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa >
ccccccccccccccccccccccccccccccccccccccccc;
* ``BOS_NonAssignment`` (in configuration: ``NonAssignment``)
Break before operators that aren't assignments.
.. code-block:: c++
LooooooooooongType loooooooooooooooooooooongVariable =
someLooooooooooooooooongFunction();
bool value = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+ aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
== aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
&& aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
> ccccccccccccccccccccccccccccccccccccccccc;
* ``BOS_All`` (in configuration: ``All``)
Break before operators.
.. code-block:: c++
LooooooooooongType loooooooooooooooooooooongVariable
= someLooooooooooooooooongFunction();
bool value = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+ aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
== aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
&& aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
> ccccccccccccccccccccccccccccccccccccccccc;
**BreakBeforeBraces** (``BraceBreakingStyle``)
The brace breaking style to use.
Possible values:
* ``BS_Attach`` (in configuration: ``Attach``)
Always attach braces to surrounding context.
.. code-block:: c++
namespace N {
enum E {
E1,
E2,
};
class C {
public:
C();
};
bool baz(int i) {
try {
do {
switch (i) {
case 1: {
foobar();
break;
}
default: {
break;
}
}
} while (--i);
return true;
} catch (...) {
handleError();
return false;
}
}
void foo(bool b) {
if (b) {
baz(2);
} else {
baz(5);
}
}
void bar() { foo(true); }
} // namespace N
* ``BS_Linux`` (in configuration: ``Linux``)
Like ``Attach``, but break before braces on function, namespace and
class definitions.
.. code-block:: c++
namespace N
{
enum E {
E1,
E2,
};
class C
{
public:
C();
};
bool baz(int i)
{
try {
do {
switch (i) {
case 1: {
foobar();
break;
}
default: {
break;
}
}
} while (--i);
return true;
} catch (...) {
handleError();
return false;
}
}
void foo(bool b)
{
if (b) {
baz(2);
} else {
baz(5);
}
}
void bar() { foo(true); }
} // namespace N
* ``BS_Mozilla`` (in configuration: ``Mozilla``)
Like ``Attach``, but break before braces on enum, function, and record
definitions.
.. code-block:: c++
namespace N {
enum E
{
E1,
E2,
};
class C
{
public:
C();
};
bool baz(int i)
{
try {
do {
switch (i) {
case 1: {
foobar();
break;
}
default: {
break;
}
}
} while (--i);
return true;
} catch (...) {
handleError();
return false;
}
}
void foo(bool b)
{
if (b) {
baz(2);
} else {
baz(5);
}
}
void bar() { foo(true); }
} // namespace N
* ``BS_Stroustrup`` (in configuration: ``Stroustrup``)
Like ``Attach``, but break before function definitions, ``catch``, and
``else``.
.. code-block:: c++
namespace N {
enum E {
E1,
E2,
};
class C {
public:
C();
};
bool baz(int i)
{
try {
do {
switch (i) {
case 1: {
foobar();
break;
}
default: {
break;
}
}
} while (--i);
return true;
}
catch (...) {
handleError();
return false;
}
}
void foo(bool b)
{
if (b) {
baz(2);
}
else {
baz(5);
}
}
void bar() { foo(true); }
} // namespace N
* ``BS_Allman`` (in configuration: ``Allman``)
Always break before braces.
.. code-block:: c++
namespace N
{
enum E
{
E1,
E2,
};
class C
{
public:
C();
};
bool baz(int i)
{
try
{
do
{
switch (i)
{
case 1:
{
foobar();
break;
}
default:
{
break;
}
}
} while (--i);
return true;
}
catch (...)
{
handleError();
return false;
}
}
void foo(bool b)
{
if (b)
{
baz(2);
}
else
{
baz(5);
}
}
void bar() { foo(true); }
} // namespace N
* ``BS_Whitesmiths`` (in configuration: ``Whitesmiths``)
Like ``Allman`` but always indent braces and line up code with braces.
.. code-block:: c++
namespace N
{
enum E
{
E1,
E2,
};
class C
{
public:
C();
};
bool baz(int i)
{
try
{
do
{
switch (i)
{
case 1:
{
foobar();
break;
}
default:
{
break;
}
}
} while (--i);
return true;
}
catch (...)
{
handleError();
return false;
}
}
void foo(bool b)
{
if (b)
{
baz(2);
}
else
{
baz(5);
}
}
void bar() { foo(true); }
} // namespace N
* ``BS_GNU`` (in configuration: ``GNU``)
Always break before braces and add an extra level of indentation to
braces of control statements, not to those of class, function
or other definitions.
.. code-block:: c++
namespace N
{
enum E
{
E1,
E2,
};
class C
{
public:
C();
};
bool baz(int i)
{
try
{
do
{
switch (i)
{
case 1:
{
foobar();
break;
}
default:
{
break;
}
}
}
while (--i);
return true;
}
catch (...)
{
handleError();
return false;
}
}
void foo(bool b)
{
if (b)
{
baz(2);
}
else
{
baz(5);
}
}
void bar() { foo(true); }
} // namespace N
* ``BS_WebKit`` (in configuration: ``WebKit``)
Like ``Attach``, but break before functions.
.. code-block:: c++
namespace N {
enum E {
E1,
E2,
};
class C {
public:
C();
};
bool baz(int i)
{
try {
do {
switch (i) {
case 1: {
foobar();
break;
}
default: {
break;
}
}
} while (--i);
return true;
} catch (...) {
handleError();
return false;
}
}
void foo(bool b)
{
if (b) {
baz(2);
} else {
baz(5);
}
}
void bar() { foo(true); }
} // namespace N
* ``BS_Custom`` (in configuration: ``Custom``)
Configure each individual brace in `BraceWrapping`.
**BreakBeforeConceptDeclarations** (``bool``)
If ``true``, concept will be placed on a new line.
.. code-block:: c++
true:
template<typename T>
concept ...
false:
template<typename T> concept ...
**BreakBeforeTernaryOperators** (``bool``)
If ``true``, ternary operators will be placed after line breaks.
.. code-block:: c++
true:
veryVeryVeryVeryVeryVeryVeryVeryVeryVeryVeryLongDescription
? firstValue
: SecondValueVeryVeryVeryVeryLong;
false:
veryVeryVeryVeryVeryVeryVeryVeryVeryVeryVeryLongDescription ?
firstValue :
SecondValueVeryVeryVeryVeryLong;
**BreakConstructorInitializers** (``BreakConstructorInitializersStyle``)
The constructor initializers style to use.
Possible values:
* ``BCIS_BeforeColon`` (in configuration: ``BeforeColon``)
Break constructor initializers before the colon and after the commas.
.. code-block:: c++
Constructor()
: initializer1(),
initializer2()
* ``BCIS_BeforeComma`` (in configuration: ``BeforeComma``)
Break constructor initializers before the colon and commas, and align
the commas with the colon.
.. code-block:: c++
Constructor()
: initializer1()
, initializer2()
* ``BCIS_AfterColon`` (in configuration: ``AfterColon``)
Break constructor initializers after the colon and commas.
.. code-block:: c++
Constructor() :
initializer1(),
initializer2()
**BreakInheritanceList** (``BreakInheritanceListStyle``)
The inheritance list style to use.
Possible values:
* ``BILS_BeforeColon`` (in configuration: ``BeforeColon``)
Break inheritance list before the colon and after the commas.
.. code-block:: c++
class Foo
: Base1,
Base2
{};
* ``BILS_BeforeComma`` (in configuration: ``BeforeComma``)
Break inheritance list before the colon and commas, and align
the commas with the colon.
.. code-block:: c++
class Foo
: Base1
, Base2
{};
* ``BILS_AfterColon`` (in configuration: ``AfterColon``)
Break inheritance list after the colon and commas.
.. code-block:: c++
class Foo :
Base1,
Base2
{};
* ``BILS_AfterComma`` (in configuration: ``AfterComma``)
Break inheritance list only after the commas.
.. code-block:: c++
class Foo : Base1,
Base2
{};
**BreakStringLiterals** (``bool``)
Allow breaking string literals when formatting.
.. code-block:: c++
true:
const char* x = "veryVeryVeryVeryVeryVe"
"ryVeryVeryVeryVeryVery"
"VeryLongString";
false:
const char* x =
"veryVeryVeryVeryVeryVeryVeryVeryVeryVeryVeryVeryLongString";
**ColumnLimit** (``unsigned``)
The column limit.
A column limit of ``0`` means that there is no column limit. In this case,
clang-format will respect the input's line breaking decisions within
statements unless they contradict other rules.
**CommentPragmas** (``std::string``)
A regular expression that describes comments with special meaning,
which should not be split into lines or otherwise changed.
.. code-block:: c++
// CommentPragmas: '^ FOOBAR pragma:'
// Will leave the following line unaffected
#include <vector> // FOOBAR pragma: keep
**CompactNamespaces** (``bool``)
If ``true``, consecutive namespace declarations will be on the same
line. If ``false``, each namespace is declared on a new line.
.. code-block:: c++
true:
namespace Foo { namespace Bar {
}}
false:
namespace Foo {
namespace Bar {
}
}
If it does not fit on a single line, the overflowing namespaces get
wrapped:
.. code-block:: c++
namespace Foo { namespace Bar {
namespace Extra {
}}}
**ConstructorInitializerAllOnOneLineOrOnePerLine** (``bool``)
If the constructor initializers don't fit on a line, put each
initializer on its own line.
.. code-block:: c++
true:
SomeClass::Constructor()
: aaaaaaaa(aaaaaaaa), aaaaaaaa(aaaaaaaa), aaaaaaaa(aaaaaaaaaaaaaaaaaaaaaaaaa) {
return 0;
}
false:
SomeClass::Constructor()
: aaaaaaaa(aaaaaaaa), aaaaaaaa(aaaaaaaa),
aaaaaaaa(aaaaaaaaaaaaaaaaaaaaaaaaa) {
return 0;
}
**ConstructorInitializerIndentWidth** (``unsigned``)
The number of characters to use for indentation of constructor
initializer lists as well as inheritance lists.
**ContinuationIndentWidth** (``unsigned``)
Indent width for line continuations.
.. code-block:: c++
ContinuationIndentWidth: 2
int i = // VeryVeryVeryVeryVeryLongComment
longFunction( // Again a long comment
arg);
**Cpp11BracedListStyle** (``bool``)
If ``true``, format braced lists as best suited for C++11 braced
lists.
Important differences:
- No spaces inside the braced list.
- No line break before the closing brace.
- Indentation with the continuation indent, not with the block indent.
Fundamentally, C++11 braced lists are formatted exactly like function
calls would be formatted in their place. If the braced list follows a name
(e.g. a type or variable name), clang-format formats as if the ``{}`` were
the parentheses of a function call with that name. If there is no name,
a zero-length name is assumed.
.. code-block:: c++
true: false:
vector<int> x{1, 2, 3, 4}; vs. vector<int> x{ 1, 2, 3, 4 };
vector<T> x{{}, {}, {}, {}}; vector<T> x{ {}, {}, {}, {} };
f(MyMap[{composite, key}]); f(MyMap[{ composite, key }]);
new int[3]{1, 2, 3}; new int[3]{ 1, 2, 3 };
**DeriveLineEnding** (``bool``)
Analyze the formatted file for the most used line ending (``\r\n``
or ``\n``). ``UseCRLF`` is only used as a fallback if none can be derived.
**DerivePointerAlignment** (``bool``)
If ``true``, analyze the formatted file for the most common
alignment of ``&`` and ``*``.
Pointer and reference alignment styles are going to be updated according
to the preferences found in the file.
``PointerAlignment`` is then used only as fallback.
**DisableFormat** (``bool``)
Disables formatting completely.
**EmptyLineAfterAccessModifier** (``EmptyLineAfterAccessModifierStyle``)
Defines when to put an empty line after access modifiers.
``EmptyLineBeforeAccessModifier`` configuration handles the number of
empty lines between two access modifiers.
Possible values:
* ``ELAAMS_Never`` (in configuration: ``Never``)
Remove all empty lines after access modifiers.
.. code-block:: c++
struct foo {
private:
int i;
protected:
int j;
/* comment */
public:
foo() {}
private:
protected:
};
* ``ELAAMS_Leave`` (in configuration: ``Leave``)
Keep existing empty lines after access modifiers.
MaxEmptyLinesToKeep is applied instead.
* ``ELAAMS_Always`` (in configuration: ``Always``)
Always add empty line after access modifiers if there are none.
MaxEmptyLinesToKeep is applied also.
.. code-block:: c++
struct foo {
private:
int i;
protected:
int j;
/* comment */
public:
foo() {}
private:
protected:
};
**EmptyLineBeforeAccessModifier** (``EmptyLineBeforeAccessModifierStyle``)
Defines in which cases to put empty line before access modifiers.
Possible values:
* ``ELBAMS_Never`` (in configuration: ``Never``)
Remove all empty lines before access modifiers.
.. code-block:: c++
struct foo {
private:
int i;
protected:
int j;
/* comment */
public:
foo() {}
private:
protected:
};
* ``ELBAMS_Leave`` (in configuration: ``Leave``)
Keep existing empty lines before access modifiers.
* ``ELBAMS_LogicalBlock`` (in configuration: ``LogicalBlock``)
Add empty line only when access modifier starts a new logical block.
Logical block is a group of one or more member fields or functions.
.. code-block:: c++
struct foo {
private:
int i;
protected:
int j;
/* comment */
public:
foo() {}
private:
protected:
};
* ``ELBAMS_Always`` (in configuration: ``Always``)
Always add empty line before access modifiers unless access modifier
is at the start of struct or class definition.
.. code-block:: c++
struct foo {
private:
int i;
protected:
int j;
/* comment */
public:
foo() {}
private:
protected:
};
**ExperimentalAutoDetectBinPacking** (``bool``)
If ``true``, clang-format detects whether function calls and
definitions are formatted with one parameter per line.
Each call can be bin-packed, one-per-line or inconclusive. If it is
inconclusive, e.g. completely on one line, but a decision needs to be
made, clang-format analyzes whether there are other bin-packed cases in
the input file and act accordingly.
NOTE: This is an experimental flag, that might go away or be renamed. Do
not use this in config files, etc. Use at your own risk.
**FixNamespaceComments** (``bool``)
If ``true``, clang-format adds missing namespace end comments for
short namespaces and fixes invalid existing ones. Short ones are
controlled by "ShortNamespaceLines".
.. code-block:: c++
true: false:
namespace a { vs. namespace a {
foo(); foo();
bar(); bar();
} // namespace a }
**ForEachMacros** (``std::vector<std::string>``)
A vector of macros that should be interpreted as foreach loops
instead of as function calls.
These are expected to be macros of the form:
.. code-block:: c++
FOREACH(<variable-declaration>, ...)
<loop-body>
In the .clang-format configuration file, this can be configured like:
.. code-block:: yaml
ForEachMacros: ['RANGES_FOR', 'FOREACH']
For example: BOOST_FOREACH.
**IfMacros** (``std::vector<std::string>``)
A vector of macros that should be interpreted as conditionals
instead of as function calls.
These are expected to be macros of the form:
.. code-block:: c++
IF(...)
<conditional-body>
else IF(...)
<conditional-body>
In the .clang-format configuration file, this can be configured like:
.. code-block:: yaml
IfMacros: ['IF']
For example: `KJ_IF_MAYBE
<https://github.com/capnproto/capnproto/blob/master/kjdoc/tour.md#maybes>`_
**IncludeBlocks** (``IncludeBlocksStyle``)
Dependent on the value, multiple ``#include`` blocks can be sorted
as one and divided based on category.
Possible values:
* ``IBS_Preserve`` (in configuration: ``Preserve``)
Sort each ``#include`` block separately.
.. code-block:: c++
#include "b.h" into #include "b.h"
#include <lib/main.h> #include "a.h"
#include "a.h" #include <lib/main.h>
* ``IBS_Merge`` (in configuration: ``Merge``)
Merge multiple ``#include`` blocks together and sort as one.
.. code-block:: c++
#include "b.h" into #include "a.h"
#include "b.h"
#include <lib/main.h> #include <lib/main.h>
#include "a.h"
* ``IBS_Regroup`` (in configuration: ``Regroup``)
Merge multiple ``#include`` blocks together and sort as one.
Then split into groups based on category priority. See
``IncludeCategories``.
.. code-block:: c++
#include "b.h" into #include "a.h"
#include "b.h"
#include <lib/main.h>
#include "a.h" #include <lib/main.h>
**IncludeCategories** (``std::vector<IncludeCategory>``)
Regular expressions denoting the different ``#include`` categories
used for ordering ``#includes``.
`POSIX extended
<https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html>`_
regular expressions are supported.
These regular expressions are matched against the filename of an include
(including the <> or "") in order. The value belonging to the first
matching regular expression is assigned and ``#includes`` are sorted first
according to increasing category number and then alphabetically within
each category.
If none of the regular expressions match, INT_MAX is assigned as
category. The main header for a source file automatically gets category 0.
so that it is generally kept at the beginning of the ``#includes``
(https://llvm.org/docs/CodingStandards.html#include-style). However, you
can also assign negative priorities if you have certain headers that
always need to be first.
There is a third and optional field ``SortPriority`` which can used while
``IncludeBlocks = IBS_Regroup`` to define the priority in which
``#includes`` should be ordered. The value of ``Priority`` defines the
order of ``#include blocks`` and also allows the grouping of ``#includes``
of different priority. ``SortPriority`` is set to the value of
``Priority`` as default if it is not assigned.
Each regular expression can be marked as case sensitive with the field
``CaseSensitive``, per default it is not.
To configure this in the .clang-format file, use:
.. code-block:: yaml
IncludeCategories:
- Regex: '^"(llvm|llvm-c|clang|clang-c)/'
Priority: 2
SortPriority: 2
CaseSensitive: true
- Regex: '^(<|"(gtest|gmock|isl|json)/)'
Priority: 3
- Regex: '<[[:alnum:].]+>'
Priority: 4
- Regex: '.*'
Priority: 1
SortPriority: 0
**IncludeIsMainRegex** (``std::string``)
Specify a regular expression of suffixes that are allowed in the
file-to-main-include mapping.
When guessing whether a #include is the "main" include (to assign
category 0, see above), use this regex of allowed suffixes to the header
stem. A partial match is done, so that:
- "" means "arbitrary suffix"
- "$" means "no suffix"
For example, if configured to "(_test)?$", then a header a.h would be seen
as the "main" include in both a.cc and a_test.cc.
**IncludeIsMainSourceRegex** (``std::string``)
Specify a regular expression for files being formatted
that are allowed to be considered "main" in the
file-to-main-include mapping.
By default, clang-format considers files as "main" only when they end
with: ``.c``, ``.cc``, ``.cpp``, ``.c++``, ``.cxx``, ``.m`` or ``.mm``
extensions.
For these files a guessing of "main" include takes place
(to assign category 0, see above). This config option allows for
additional suffixes and extensions for files to be considered as "main".
For example, if this option is configured to ``(Impl\.hpp)$``,
then a file ``ClassImpl.hpp`` is considered "main" (in addition to
``Class.c``, ``Class.cc``, ``Class.cpp`` and so on) and "main
include file" logic will be executed (with *IncludeIsMainRegex* setting
also being respected in later phase). Without this option set,
``ClassImpl.hpp`` would not have the main include file put on top
before any other include.
**IndentAccessModifiers** (``bool``)
Specify whether access modifiers should have their own indentation level.
When ``false``, access modifiers are indented (or outdented) relative to
the record members, respecting the ``AccessModifierOffset``. Record
members are indented one level below the record.
When ``true``, access modifiers get their own indentation level. As a
consequence, record members are always indented 2 levels below the record,
regardless of the access modifier presence. Value of the
``AccessModifierOffset`` is ignored.
.. code-block:: c++
false: true:
class C { vs. class C {
class D { class D {
void bar(); void bar();
protected: protected:
D(); D();
}; };
public: public:
C(); C();
}; };
void foo() { void foo() {
return 1; return 1;
} }
**IndentCaseBlocks** (``bool``)
Indent case label blocks one level from the case label.
When ``false``, the block following the case label uses the same
indentation level as for the case label, treating the case label the same
as an if-statement.
When ``true``, the block gets indented as a scope block.
.. code-block:: c++
false: true:
switch (fool) { vs. switch (fool) {
case 1: { case 1:
bar(); {
} break; bar();
default: { }
plop(); break;
} default:
} {
plop();
}
}
**IndentCaseLabels** (``bool``)
Indent case labels one level from the switch statement.
When ``false``, use the same indentation level as for the switch
statement. Switch statement body is always indented one level more than
case labels (except the first block following the case label, which
itself indents the code - unless IndentCaseBlocks is enabled).
.. code-block:: c++
false: true:
switch (fool) { vs. switch (fool) {
case 1: case 1:
bar(); bar();
break; break;
default: default:
plop(); plop();
} }
**IndentExternBlock** (``IndentExternBlockStyle``)
IndentExternBlockStyle is the type of indenting of extern blocks.
Possible values:
* ``IEBS_AfterExternBlock`` (in configuration: ``AfterExternBlock``)
Backwards compatible with AfterExternBlock's indenting.
.. code-block:: c++
IndentExternBlock: AfterExternBlock
BraceWrapping.AfterExternBlock: true
extern "C"
{
void foo();
}
.. code-block:: c++
IndentExternBlock: AfterExternBlock
BraceWrapping.AfterExternBlock: false
extern "C" {
void foo();
}
* ``IEBS_NoIndent`` (in configuration: ``NoIndent``)
Does not indent extern blocks.
.. code-block:: c++
extern "C" {
void foo();
}
* ``IEBS_Indent`` (in configuration: ``Indent``)
Indents extern blocks.
.. code-block:: c++
extern "C" {
void foo();
}
**IndentGotoLabels** (``bool``)
Indent goto labels.
When ``false``, goto labels are flushed left.
.. code-block:: c++
true: false:
int f() { vs. int f() {
if (foo()) { if (foo()) {
label1: label1:
bar(); bar();
} }
label2: label2:
return 1; return 1;
} }
**IndentPPDirectives** (``PPDirectiveIndentStyle``)
The preprocessor directive indenting style to use.
Possible values:
* ``PPDIS_None`` (in configuration: ``None``)
Does not indent any directives.
.. code-block:: c++
#if FOO
#if BAR
#include <foo>
#endif
#endif
* ``PPDIS_AfterHash`` (in configuration: ``AfterHash``)
Indents directives after the hash.
.. code-block:: c++
#if FOO
# if BAR
# include <foo>
# endif
#endif
* ``PPDIS_BeforeHash`` (in configuration: ``BeforeHash``)
Indents directives before the hash.
.. code-block:: c++
#if FOO
#if BAR
#include <foo>
#endif
#endif
**IndentRequires** (``bool``)
Indent the requires clause in a template
.. code-block:: c++
true:
template <typename It>
requires Iterator<It>
void sort(It begin, It end) {
//....
}
false:
template <typename It>
requires Iterator<It>
void sort(It begin, It end) {
//....
}
**IndentWidth** (``unsigned``)
The number of columns to use for indentation.
.. code-block:: c++
IndentWidth: 3
void f() {
someFunction();
if (true, false) {
f();
}
}
**IndentWrappedFunctionNames** (``bool``)
Indent if a function definition or declaration is wrapped after the
type.
.. code-block:: c++
true:
LoooooooooooooooooooooooooooooooooooooooongReturnType
LoooooooooooooooooooooooooooooooongFunctionDeclaration();
false:
LoooooooooooooooooooooooooooooooooooooooongReturnType
LoooooooooooooooooooooooooooooooongFunctionDeclaration();
**InsertTrailingCommas** (``TrailingCommaStyle``)
If set to ``TCS_Wrapped`` will insert trailing commas in container
literals (arrays and objects) that wrap across multiple lines.
It is currently only available for JavaScript
and disabled by default ``TCS_None``.
``InsertTrailingCommas`` cannot be used together with ``BinPackArguments``
as inserting the comma disables bin-packing.
.. code-block:: c++
TSC_Wrapped:
const someArray = [
aaaaaaaaaaaaaaaaaaaaaaaaaa,
aaaaaaaaaaaaaaaaaaaaaaaaaa,
aaaaaaaaaaaaaaaaaaaaaaaaaa,
// ^ inserted
]
Possible values:
* ``TCS_None`` (in configuration: ``None``)
Do not insert trailing commas.
* ``TCS_Wrapped`` (in configuration: ``Wrapped``)
Insert trailing commas in container literals that were wrapped over
multiple lines. Note that this is conceptually incompatible with
bin-packing, because the trailing comma is used as an indicator
that a container should be formatted one-per-line (i.e. not bin-packed).
So inserting a trailing comma counteracts bin-packing.
**JavaImportGroups** (``std::vector<std::string>``)
A vector of prefixes ordered by the desired groups for Java imports.
One group's prefix can be a subset of another - the longest prefix is
always matched. Within a group, the imports are ordered lexicographically.
Static imports are grouped separately and follow the same group rules.
By default, static imports are placed before non-static imports,
but this behavior is changed by another option,
``SortJavaStaticImport``.
In the .clang-format configuration file, this can be configured like
in the following yaml example. This will result in imports being
formatted as in the Java example below.
.. code-block:: yaml
JavaImportGroups: ['com.example', 'com', 'org']
.. code-block:: java
import static com.example.function1;
import static com.test.function2;
import static org.example.function3;
import com.example.ClassA;
import com.example.Test;
import com.example.a.ClassB;
import com.test.ClassC;
import org.example.ClassD;
**JavaScriptQuotes** (``JavaScriptQuoteStyle``)
The JavaScriptQuoteStyle to use for JavaScript strings.
Possible values:
* ``JSQS_Leave`` (in configuration: ``Leave``)
Leave string quotes as they are.
.. code-block:: js
string1 = "foo";
string2 = 'bar';
* ``JSQS_Single`` (in configuration: ``Single``)
Always use single quotes.
.. code-block:: js
string1 = 'foo';
string2 = 'bar';
* ``JSQS_Double`` (in configuration: ``Double``)
Always use double quotes.
.. code-block:: js
string1 = "foo";
string2 = "bar";
**JavaScriptWrapImports** (``bool``)
Whether to wrap JavaScript import/export statements.
.. code-block:: js
true:
import {
VeryLongImportsAreAnnoying,
VeryLongImportsAreAnnoying,
VeryLongImportsAreAnnoying,
} from 'some/module.js'
false:
import {VeryLongImportsAreAnnoying, VeryLongImportsAreAnnoying, VeryLongImportsAreAnnoying,} from "some/module.js"
**KeepEmptyLinesAtTheStartOfBlocks** (``bool``)
If true, the empty line at the start of blocks is kept.
.. code-block:: c++
true: false:
if (foo) { vs. if (foo) {
bar();
bar(); }
}
**LambdaBodyIndentation** (``LambdaBodyIndentationKind``)
The indentation style of lambda bodies. ``Signature`` (the default)
causes the lambda body to be indented one additional level relative to
the indentation level of the signature. ``OuterScope`` forces the lambda
body to be indented one additional level relative to the parent scope
containing the lambda signature. For callback-heavy code, it may improve
readability to have the signature indented two levels and to use
``OuterScope``. The KJ style guide requires ``OuterScope``.
`KJ style guide
<https://github.com/capnproto/capnproto/blob/master/kjdoc/style-guide.md>`_
Possible values:
* ``LBI_Signature`` (in configuration: ``Signature``)
Align lambda body relative to the lambda signature. This is the default.
.. code-block:: c++
someMethod(
[](SomeReallyLongLambdaSignatureArgument foo) {
return;
});
* ``LBI_OuterScope`` (in configuration: ``OuterScope``)
Align lambda body relative to the indentation level of the outer scope
the lambda signature resides in.
.. code-block:: c++
someMethod(
[](SomeReallyLongLambdaSignatureArgument foo) {
return;
});
**Language** (``LanguageKind``)
Language, this format style is targeted at.
Possible values:
* ``LK_None`` (in configuration: ``None``)
Do not use.
* ``LK_Cpp`` (in configuration: ``Cpp``)
Should be used for C, C++.
* ``LK_CSharp`` (in configuration: ``CSharp``)
Should be used for C#.
* ``LK_Java`` (in configuration: ``Java``)
Should be used for Java.
* ``LK_JavaScript`` (in configuration: ``JavaScript``)
Should be used for JavaScript.
* ``LK_Json`` (in configuration: ``Json``)
Should be used for JSON.
* ``LK_ObjC`` (in configuration: ``ObjC``)
Should be used for Objective-C, Objective-C++.
* ``LK_Proto`` (in configuration: ``Proto``)
Should be used for Protocol Buffers
(https://developers.google.com/protocol-buffers/).
* ``LK_TableGen`` (in configuration: ``TableGen``)
Should be used for TableGen code.
* ``LK_TextProto`` (in configuration: ``TextProto``)
Should be used for Protocol Buffer messages in text format
(https://developers.google.com/protocol-buffers/).
**MacroBlockBegin** (``std::string``)
A regular expression matching macros that start a block.
.. code-block:: c++
# With:
MacroBlockBegin: "^NS_MAP_BEGIN|\
NS_TABLE_HEAD$"
MacroBlockEnd: "^\
NS_MAP_END|\
NS_TABLE_.*_END$"
NS_MAP_BEGIN
foo();
NS_MAP_END
NS_TABLE_HEAD
bar();
NS_TABLE_FOO_END
# Without:
NS_MAP_BEGIN
foo();
NS_MAP_END
NS_TABLE_HEAD
bar();
NS_TABLE_FOO_END
**MacroBlockEnd** (``std::string``)
A regular expression matching macros that end a block.
**MaxEmptyLinesToKeep** (``unsigned``)
The maximum number of consecutive empty lines to keep.
.. code-block:: c++
MaxEmptyLinesToKeep: 1 vs. MaxEmptyLinesToKeep: 0
int f() { int f() {
int = 1; int i = 1;
i = foo();
i = foo(); return i;
}
return i;
}
**NamespaceIndentation** (``NamespaceIndentationKind``)
The indentation used for namespaces.
Possible values:
* ``NI_None`` (in configuration: ``None``)
Don't indent in namespaces.
.. code-block:: c++
namespace out {
int i;
namespace in {
int i;
}
}
* ``NI_Inner`` (in configuration: ``Inner``)
Indent only in inner namespaces (nested in other namespaces).
.. code-block:: c++
namespace out {
int i;
namespace in {
int i;
}
}
* ``NI_All`` (in configuration: ``All``)
Indent in all namespaces.
.. code-block:: c++
namespace out {
int i;
namespace in {
int i;
}
}
**NamespaceMacros** (``std::vector<std::string>``)
A vector of macros which are used to open namespace blocks.
These are expected to be macros of the form:
.. code-block:: c++
NAMESPACE(<namespace-name>, ...) {
<namespace-content>
}
For example: TESTSUITE
**ObjCBinPackProtocolList** (``BinPackStyle``)
Controls bin-packing Objective-C protocol conformance list
items into as few lines as possible when they go over ``ColumnLimit``.
If ``Auto`` (the default), delegates to the value in
``BinPackParameters``. If that is ``true``, bin-packs Objective-C
protocol conformance list items into as few lines as possible
whenever they go over ``ColumnLimit``.
If ``Always``, always bin-packs Objective-C protocol conformance
list items into as few lines as possible whenever they go over
``ColumnLimit``.
If ``Never``, lays out Objective-C protocol conformance list items
onto individual lines whenever they go over ``ColumnLimit``.
.. code-block:: objc
Always (or Auto, if BinPackParameters=true):
@interface ccccccccccccc () <
ccccccccccccc, ccccccccccccc,
ccccccccccccc, ccccccccccccc> {
}
Never (or Auto, if BinPackParameters=false):
@interface ddddddddddddd () <
ddddddddddddd,
ddddddddddddd,
ddddddddddddd,
ddddddddddddd> {
}
Possible values:
* ``BPS_Auto`` (in configuration: ``Auto``)
Automatically determine parameter bin-packing behavior.
* ``BPS_Always`` (in configuration: ``Always``)
Always bin-pack parameters.
* ``BPS_Never`` (in configuration: ``Never``)
Never bin-pack parameters.
**ObjCBlockIndentWidth** (``unsigned``)
The number of characters to use for indentation of ObjC blocks.
.. code-block:: objc
ObjCBlockIndentWidth: 4
[operation setCompletionBlock:^{
[self onOperationDone];
}];
**ObjCBreakBeforeNestedBlockParam** (``bool``)
Break parameters list into lines when there is nested block
parameters in a function call.
.. code-block:: c++
false:
- (void)_aMethod
{
[self.test1 t:self w:self callback:^(typeof(self) self, NSNumber
*u, NSNumber *v) {
u = c;
}]
}
true:
- (void)_aMethod
{
[self.test1 t:self
w:self
callback:^(typeof(self) self, NSNumber *u, NSNumber *v) {
u = c;
}]
}
**ObjCSpaceAfterProperty** (``bool``)
Add a space after ``@property`` in Objective-C, i.e. use
``@property (readonly)`` instead of ``@property(readonly)``.
**ObjCSpaceBeforeProtocolList** (``bool``)
Add a space in front of an Objective-C protocol list, i.e. use
``Foo <Protocol>`` instead of ``Foo<Protocol>``.
**PPIndentWidth** (``int``)
The number of columns to use for indentation of preprocessor statements.
When set to -1 (default) ``IndentWidth`` is used also for preprocessor
statements.
.. code-block:: c++
PPIndentWidth: 1
#ifdef __linux__
# define FOO
#else
# define BAR
#endif
**PenaltyBreakAssignment** (``unsigned``)
The penalty for breaking around an assignment operator.
**PenaltyBreakBeforeFirstCallParameter** (``unsigned``)
The penalty for breaking a function call after ``call(``.
**PenaltyBreakComment** (``unsigned``)
The penalty for each line break introduced inside a comment.
**PenaltyBreakFirstLessLess** (``unsigned``)
The penalty for breaking before the first ``<<``.
**PenaltyBreakString** (``unsigned``)
The penalty for each line break introduced inside a string literal.
**PenaltyBreakTemplateDeclaration** (``unsigned``)
The penalty for breaking after template declaration.
**PenaltyExcessCharacter** (``unsigned``)
The penalty for each character outside of the column limit.
**PenaltyIndentedWhitespace** (``unsigned``)
Penalty for each character of whitespace indentation
(counted relative to leading non-whitespace column).
**PenaltyReturnTypeOnItsOwnLine** (``unsigned``)
Penalty for putting the return type of a function onto its own
line.
**PointerAlignment** (``PointerAlignmentStyle``)
Pointer and reference alignment style.
Possible values:
* ``PAS_Left`` (in configuration: ``Left``)
Align pointer to the left.
.. code-block:: c++
int* a;
* ``PAS_Right`` (in configuration: ``Right``)
Align pointer to the right.
.. code-block:: c++
int *a;
* ``PAS_Middle`` (in configuration: ``Middle``)
Align pointer in the middle.
.. code-block:: c++
int * a;
**RawStringFormats** (``std::vector<RawStringFormat>``)
Defines hints for detecting supported languages code blocks in raw
strings.
A raw string with a matching delimiter or a matching enclosing function
name will be reformatted assuming the specified language based on the
style for that language defined in the .clang-format file. If no style has
been defined in the .clang-format file for the specific language, a
predefined style given by 'BasedOnStyle' is used. If 'BasedOnStyle' is not
found, the formatting is based on llvm style. A matching delimiter takes
precedence over a matching enclosing function name for determining the
language of the raw string contents.
If a canonical delimiter is specified, occurrences of other delimiters for
the same language will be updated to the canonical if possible.
There should be at most one specification per language and each delimiter
and enclosing function should not occur in multiple specifications.
To configure this in the .clang-format file, use:
.. code-block:: yaml
RawStringFormats:
- Language: TextProto
Delimiters:
- 'pb'
- 'proto'
EnclosingFunctions:
- 'PARSE_TEXT_PROTO'
BasedOnStyle: google
- Language: Cpp
Delimiters:
- 'cc'
- 'cpp'
BasedOnStyle: llvm
CanonicalDelimiter: 'cc'
**ReferenceAlignment** (``ReferenceAlignmentStyle``)
Reference alignment style (overrides ``PointerAlignment`` for
references).
Possible values:
* ``RAS_Pointer`` (in configuration: ``Pointer``)
Align reference like ``PointerAlignment``.
* ``RAS_Left`` (in configuration: ``Left``)
Align reference to the left.
.. code-block:: c++
int& a;
* ``RAS_Right`` (in configuration: ``Right``)
Align reference to the right.
.. code-block:: c++
int &a;
* ``RAS_Middle`` (in configuration: ``Middle``)
Align reference in the middle.
.. code-block:: c++
int & a;
**ReflowComments** (``bool``)
If ``true``, clang-format will attempt to re-flow comments.
.. code-block:: c++
false:
// veryVeryVeryVeryVeryVeryVeryVeryVeryVeryVeryLongComment with plenty of information
/* second veryVeryVeryVeryVeryVeryVeryVeryVeryVeryVeryLongComment with plenty of information */
true:
// veryVeryVeryVeryVeryVeryVeryVeryVeryVeryVeryLongComment with plenty of
// information
/* second veryVeryVeryVeryVeryVeryVeryVeryVeryVeryVeryLongComment with plenty of
* information */
**ShortNamespaceLines** (``unsigned``)
The maximal number of unwrapped lines that a short namespace spans.
Defaults to 1.
This determines the maximum length of short namespaces by counting
unwrapped lines (i.e. containing neither opening nor closing
namespace brace) and makes "FixNamespaceComments" omit adding
end comments for those.
.. code-block:: c++
ShortNamespaceLines: 1 vs. ShortNamespaceLines: 0
namespace a { namespace a {
int foo; int foo;
} } // namespace a
ShortNamespaceLines: 1 vs. ShortNamespaceLines: 0
namespace b { namespace b {
int foo; int foo;
int bar; int bar;
} // namespace b } // namespace b
**SortIncludes** (``SortIncludesOptions``)
Controls if and how clang-format will sort ``#includes``.
If ``Never``, includes are never sorted.
If ``CaseInsensitive``, includes are sorted in an ASCIIbetical or case
insensitive fashion.
If ``CaseSensitive``, includes are sorted in an alphabetical or case
sensitive fashion.
Possible values:
* ``SI_Never`` (in configuration: ``Never``)
Includes are never sorted.
.. code-block:: c++
#include "B/A.h"
#include "A/B.h"
#include "a/b.h"
#include "A/b.h"
#include "B/a.h"
* ``SI_CaseSensitive`` (in configuration: ``CaseSensitive``)
Includes are sorted in an ASCIIbetical or case sensitive fashion.
.. code-block:: c++
#include "A/B.h"
#include "A/b.h"
#include "B/A.h"
#include "B/a.h"
#include "a/b.h"
* ``SI_CaseInsensitive`` (in configuration: ``CaseInsensitive``)
Includes are sorted in an alphabetical or case insensitive fashion.
.. code-block:: c++
#include "A/B.h"
#include "A/b.h"
#include "a/b.h"
#include "B/A.h"
#include "B/a.h"
**SortJavaStaticImport** (``SortJavaStaticImportOptions``)
When sorting Java imports, by default static imports are placed before
non-static imports. If ``JavaStaticImportAfterImport`` is ``After``,
static imports are placed after non-static imports.
Possible values:
* ``SJSIO_Before`` (in configuration: ``Before``)
Static imports are placed before non-static imports.
.. code-block:: java
import static org.example.function1;
import org.example.ClassA;
* ``SJSIO_After`` (in configuration: ``After``)
Static imports are placed after non-static imports.
.. code-block:: java
import org.example.ClassA;
import static org.example.function1;
**SortUsingDeclarations** (``bool``)
If ``true``, clang-format will sort using declarations.
The order of using declarations is defined as follows:
Split the strings by "::" and discard any initial empty strings. The last
element of each list is a non-namespace name; all others are namespace
names. Sort the lists of names lexicographically, where the sort order of
individual names is that all non-namespace names come before all namespace
names, and within those groups, names are in case-insensitive
lexicographic order.
.. code-block:: c++
false: true:
using std::cout; vs. using std::cin;
using std::cin; using std::cout;
**SpaceAfterCStyleCast** (``bool``)
If ``true``, a space is inserted after C style casts.
.. code-block:: c++
true: false:
(int) i; vs. (int)i;
**SpaceAfterLogicalNot** (``bool``)
If ``true``, a space is inserted after the logical not operator (``!``).
.. code-block:: c++
true: false:
! someExpression(); vs. !someExpression();
**SpaceAfterTemplateKeyword** (``bool``)
If ``true``, a space will be inserted after the 'template' keyword.
.. code-block:: c++
true: false:
template <int> void foo(); vs. template<int> void foo();
**SpaceAroundPointerQualifiers** (``SpaceAroundPointerQualifiersStyle``)
Defines in which cases to put a space before or after pointer qualifiers
Possible values:
* ``SAPQ_Default`` (in configuration: ``Default``)
Don't ensure spaces around pointer qualifiers and use PointerAlignment
instead.
.. code-block:: c++
PointerAlignment: Left PointerAlignment: Right
void* const* x = NULL; vs. void *const *x = NULL;
* ``SAPQ_Before`` (in configuration: ``Before``)
Ensure that there is a space before pointer qualifiers.
.. code-block:: c++
PointerAlignment: Left PointerAlignment: Right
void* const* x = NULL; vs. void * const *x = NULL;
* ``SAPQ_After`` (in configuration: ``After``)
Ensure that there is a space after pointer qualifiers.
.. code-block:: c++
PointerAlignment: Left PointerAlignment: Right
void* const * x = NULL; vs. void *const *x = NULL;
* ``SAPQ_Both`` (in configuration: ``Both``)
Ensure that there is a space both before and after pointer qualifiers.
.. code-block:: c++
PointerAlignment: Left PointerAlignment: Right
void* const * x = NULL; vs. void * const *x = NULL;
**SpaceBeforeAssignmentOperators** (``bool``)
If ``false``, spaces will be removed before assignment operators.
.. code-block:: c++
true: false:
int a = 5; vs. int a= 5;
a += 42; a+= 42;
**SpaceBeforeCaseColon** (``bool``)
If ``false``, spaces will be removed before case colon.
.. code-block:: c++
true: false
switch (x) { vs. switch (x) {
case 1 : break; case 1: break;
} }
**SpaceBeforeCpp11BracedList** (``bool``)
If ``true``, a space will be inserted before a C++11 braced list
used to initialize an object (after the preceding identifier or type).
.. code-block:: c++
true: false:
Foo foo { bar }; vs. Foo foo{ bar };
Foo {}; Foo{};
vector<int> { 1, 2, 3 }; vector<int>{ 1, 2, 3 };
new int[3] { 1, 2, 3 }; new int[3]{ 1, 2, 3 };
**SpaceBeforeCtorInitializerColon** (``bool``)
If ``false``, spaces will be removed before constructor initializer
colon.
.. code-block:: c++
true: false:
Foo::Foo() : a(a) {} Foo::Foo(): a(a) {}
**SpaceBeforeInheritanceColon** (``bool``)
If ``false``, spaces will be removed before inheritance colon.
.. code-block:: c++
true: false:
class Foo : Bar {} vs. class Foo: Bar {}
**SpaceBeforeParens** (``SpaceBeforeParensOptions``)
Defines in which cases to put a space before opening parentheses.
Possible values:
* ``SBPO_Never`` (in configuration: ``Never``)
Never put a space before opening parentheses.
.. code-block:: c++
void f() {
if(true) {
f();
}
}
* ``SBPO_ControlStatements`` (in configuration: ``ControlStatements``)
Put a space before opening parentheses only after control statement
keywords (``for/if/while...``).
.. code-block:: c++
void f() {
if (true) {
f();
}
}
* ``SBPO_ControlStatementsExceptControlMacros`` (in configuration: ``ControlStatementsExceptControlMacros``)
Same as ``SBPO_ControlStatements`` except this option doesn't apply to
ForEach and If macros. This is useful in projects where ForEach/If
macros are treated as function calls instead of control statements.
``SBPO_ControlStatementsExceptForEachMacros`` remains an alias for
backward compatability.
.. code-block:: c++
void f() {
Q_FOREACH(...) {
f();
}
}
* ``SBPO_NonEmptyParentheses`` (in configuration: ``NonEmptyParentheses``)
Put a space before opening parentheses only if the parentheses are not
empty i.e. '()'
.. code-block:: c++
void() {
if (true) {
f();
g (x, y, z);
}
}
* ``SBPO_Always`` (in configuration: ``Always``)
Always put a space before opening parentheses, except when it's
prohibited by the syntax rules (in function-like macro definitions) or
when determined by other style rules (after unary operators, opening
parentheses, etc.)
.. code-block:: c++
void f () {
if (true) {
f ();
}
}
**SpaceBeforeRangeBasedForLoopColon** (``bool``)
If ``false``, spaces will be removed before range-based for loop
colon.
.. code-block:: c++
true: false:
for (auto v : values) {} vs. for(auto v: values) {}
**SpaceBeforeSquareBrackets** (``bool``)
If ``true``, spaces will be before ``[``.
Lambdas will not be affected. Only the first ``[`` will get a space added.
.. code-block:: c++
true: false:
int a [5]; vs. int a[5];
int a [5][5]; vs. int a[5][5];
**SpaceInEmptyBlock** (``bool``)
If ``true``, spaces will be inserted into ``{}``.
.. code-block:: c++
true: false:
void f() { } vs. void f() {}
while (true) { } while (true) {}
**SpaceInEmptyParentheses** (``bool``)
If ``true``, spaces may be inserted into ``()``.
.. code-block:: c++
true: false:
void f( ) { vs. void f() {
int x[] = {foo( ), bar( )}; int x[] = {foo(), bar()};
if (true) { if (true) {
f( ); f();
} }
} }
**SpacesBeforeTrailingComments** (``unsigned``)
The number of spaces before trailing line comments
(``//`` - comments).
This does not affect trailing block comments (``/*`` - comments) as
those commonly have different usage patterns and a number of special
cases.
.. code-block:: c++
SpacesBeforeTrailingComments: 3
void f() {
if (true) { // foo1
f(); // bar
} // foo
}
**SpacesInAngles** (``SpacesInAnglesStyle``)
The SpacesInAnglesStyle to use for template argument lists.
Possible values:
* ``SIAS_Never`` (in configuration: ``Never``)
Remove spaces after ``<`` and before ``>``.
.. code-block:: c++
static_cast<int>(arg);
std::function<void(int)> fct;
* ``SIAS_Always`` (in configuration: ``Always``)
Add spaces after ``<`` and before ``>``.
.. code-block:: c++
static_cast< int >(arg);
std::function< void(int) > fct;
* ``SIAS_Leave`` (in configuration: ``Leave``)
Keep a single space after ``<`` and before ``>`` if any spaces were
present. Option ``Standard: Cpp03`` takes precedence.
**SpacesInCStyleCastParentheses** (``bool``)
If ``true``, spaces may be inserted into C style casts.
.. code-block:: c++
true: false:
x = ( int32 )y vs. x = (int32)y
**SpacesInConditionalStatement** (``bool``)
If ``true``, spaces will be inserted around if/for/switch/while
conditions.
.. code-block:: c++
true: false:
if ( a ) { ... } vs. if (a) { ... }
while ( i < 5 ) { ... } while (i < 5) { ... }
**SpacesInContainerLiterals** (``bool``)
If ``true``, spaces are inserted inside container literals (e.g.
ObjC and Javascript array and dict literals).
.. code-block:: js
true: false:
var arr = [ 1, 2, 3 ]; vs. var arr = [1, 2, 3];
f({a : 1, b : 2, c : 3}); f({a: 1, b: 2, c: 3});
**SpacesInLineCommentPrefix** (``SpacesInLineComment``)
How many spaces are allowed at the start of a line comment. To disable the
maximum set it to ``-1``, apart from that the maximum takes precedence
over the minimum.
Minimum = 1 Maximum = -1
// One space is forced
// but more spaces are possible
Minimum = 0
Maximum = 0
//Forces to start every comment directly after the slashes
Note that in line comment sections the relative indent of the subsequent
lines is kept, that means the following:
.. code-block:: c++
before: after:
Minimum: 1
//if (b) { // if (b) {
// return true; // return true;
//} // }
Maximum: 0
/// List: ///List:
/// - Foo /// - Foo
/// - Bar /// - Bar
Nested configuration flags:
* ``unsigned Minimum`` The minimum number of spaces at the start of the comment.
* ``unsigned Maximum`` The maximum number of spaces at the start of the comment.
**SpacesInParentheses** (``bool``)
If ``true``, spaces will be inserted after ``(`` and before ``)``.
.. code-block:: c++
true: false:
t f( Deleted & ) & = delete; vs. t f(Deleted &) & = delete;
**SpacesInSquareBrackets** (``bool``)
If ``true``, spaces will be inserted after ``[`` and before ``]``.
Lambdas without arguments or unspecified size array declarations will not
be affected.
.. code-block:: c++
true: false:
int a[ 5 ]; vs. int a[5];
std::unique_ptr<int[]> foo() {} // Won't be affected
**Standard** (``LanguageStandard``)
Parse and format C++ constructs compatible with this standard.
.. code-block:: c++
c++03: latest:
vector<set<int> > x; vs. vector<set<int>> x;
Possible values:
* ``LS_Cpp03`` (in configuration: ``c++03``)
Parse and format as C++03.
``Cpp03`` is a deprecated alias for ``c++03``
* ``LS_Cpp11`` (in configuration: ``c++11``)
Parse and format as C++11.
* ``LS_Cpp14`` (in configuration: ``c++14``)
Parse and format as C++14.
* ``LS_Cpp17`` (in configuration: ``c++17``)
Parse and format as C++17.
* ``LS_Cpp20`` (in configuration: ``c++20``)
Parse and format as C++20.
* ``LS_Latest`` (in configuration: ``Latest``)
Parse and format using the latest supported language version.
``Cpp11`` is a deprecated alias for ``Latest``
* ``LS_Auto`` (in configuration: ``Auto``)
Automatic detection based on the input.
**StatementAttributeLikeMacros** (``std::vector<std::string>``)
Macros which are ignored in front of a statement, as if they were an
attribute. So that they are not parsed as identifier, for example for Qts
emit.
.. code-block:: c++
AlignConsecutiveDeclarations: true
StatementAttributeLikeMacros: []
unsigned char data = 'x';
emit signal(data); // This is parsed as variable declaration.
AlignConsecutiveDeclarations: true
StatementAttributeLikeMacros: [emit]
unsigned char data = 'x';
emit signal(data); // Now it's fine again.
**StatementMacros** (``std::vector<std::string>``)
A vector of macros that should be interpreted as complete
statements.
Typical macros are expressions, and require a semi-colon to be
added; sometimes this is not the case, and this allows to make
clang-format aware of such cases.
For example: Q_UNUSED
**TabWidth** (``unsigned``)
The number of columns used for tab stops.
**TypenameMacros** (``std::vector<std::string>``)
A vector of macros that should be interpreted as type declarations
instead of as function calls.
These are expected to be macros of the form:
.. code-block:: c++
STACK_OF(...)
In the .clang-format configuration file, this can be configured like:
.. code-block:: yaml
TypenameMacros: ['STACK_OF', 'LIST']
For example: OpenSSL STACK_OF, BSD LIST_ENTRY.
**UseCRLF** (``bool``)
Use ``\r\n`` instead of ``\n`` for line breaks.
Also used as fallback if ``DeriveLineEnding`` is true.
**UseTab** (``UseTabStyle``)
The way to use tab characters in the resulting file.
Possible values:
* ``UT_Never`` (in configuration: ``Never``)
Never use tab.
* ``UT_ForIndentation`` (in configuration: ``ForIndentation``)
Use tabs only for indentation.
* ``UT_ForContinuationAndIndentation`` (in configuration: ``ForContinuationAndIndentation``)
Fill all leading whitespace with tabs, and use spaces for alignment that
appears within a line (e.g. consecutive assignments and declarations).
* ``UT_AlignWithSpaces`` (in configuration: ``AlignWithSpaces``)
Use tabs for line continuation and indentation, and spaces for
alignment.
* ``UT_Always`` (in configuration: ``Always``)
Use tabs whenever we need to fill whitespace that spans at least from
one tab stop to the next one.
**WhitespaceSensitiveMacros** (``std::vector<std::string>``)
A vector of macros which are whitespace-sensitive and should not
be touched.
These are expected to be macros of the form:
.. code-block:: c++
STRINGIZE(...)
In the .clang-format configuration file, this can be configured like:
.. code-block:: yaml
WhitespaceSensitiveMacros: ['STRINGIZE', 'PP_STRINGIZE']
For example: BOOST_PP_STRINGIZE
.. END_FORMAT_STYLE_OPTIONS
Adding additional style options
===============================
Each additional style option adds costs to the clang-format project. Some of
these costs affect the clang-format development itself, as we need to make
sure that any given combination of options work and that new features don't
break any of the existing options in any way. There are also costs for end users
as options become less discoverable and people have to think about and make a
decision on options they don't really care about.
The goal of the clang-format project is more on the side of supporting a
limited set of styles really well as opposed to supporting every single style
used by a codebase somewhere in the wild. Of course, we do want to support all
major projects and thus have established the following bar for adding style
options. Each new style option must ..
* be used in a project of significant size (have dozens of contributors)
* have a publicly accessible style guide
* have a person willing to contribute and maintain patches
Examples
========
A style similar to the `Linux Kernel style
<https://www.kernel.org/doc/Documentation/CodingStyle>`_:
.. code-block:: yaml
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: Always
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
The result is (imagine that tabs are used for indentation here):
.. code-block:: c++
void test()
{
switch (x) {
case 0:
case 1:
do_something();
break;
case 2:
do_something_else();
break;
default:
break;
}
if (condition)
do_something_completely_different();
if (x == y) {
q();
} else if (x > y) {
w();
} else {
r();
}
}
A style similar to the default Visual Studio formatting style:
.. code-block:: yaml
UseTab: Never
IndentWidth: 4
BreakBeforeBraces: Allman
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
ColumnLimit: 0
The result is:
.. code-block:: c++
void test()
{
switch (suffix)
{
case 0:
case 1:
do_something();
break;
case 2:
do_something_else();
break;
default:
break;
}
if (condition)
do_something_completely_different();
if (x == y)
{
q();
}
else if (x > y)
{
w();
}
else
{
r();
}
}
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