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// RUN: %clang_cc1 -std=c++98 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++11 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
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// RUN: %clang_cc1 -std=c++14 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
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// RUN: %clang_cc1 -std=c++17 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
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__extension__ typedef __SIZE_TYPE__ size_t ;
namespace std {
template < typename T > struct initializer_list {
const T * ptr ;
size_t n ;
initializer_list ( const T * , size_t ) ;
} ;
}
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# if __cplusplus >= 201103L
namespace dr1305 { // dr1305: yes
struct Incomplete ; // expected-note {{forward declaration of 'dr1305::Incomplete'}}
struct Complete { } ;
[clang] Implement ElaboratedType sugaring for types written bare
Without this patch, clang will not wrap in an ElaboratedType node types written
without a keyword and nested name qualifier, which goes against the intent that
we should produce an AST which retains enough details to recover how things are
written.
The lack of this sugar is incompatible with the intent of the type printer
default policy, which is to print types as written, but to fall back and print
them fully qualified when they are desugared.
An ElaboratedTypeLoc without keyword / NNS uses no storage by itself, but still
requires pointer alignment due to pre-existing bug in the TypeLoc buffer
handling.
---
Troubleshooting list to deal with any breakage seen with this patch:
1) The most likely effect one would see by this patch is a change in how
a type is printed. The type printer will, by design and default,
print types as written. There are customization options there, but
not that many, and they mainly apply to how to print a type that we
somehow failed to track how it was written. This patch fixes a
problem where we failed to distinguish between a type
that was written without any elaborated-type qualifiers,
such as a 'struct'/'class' tags and name spacifiers such as 'std::',
and one that has been stripped of any 'metadata' that identifies such,
the so called canonical types.
Example:
```
namespace foo {
struct A {};
A a;
};
```
If one were to print the type of `foo::a`, prior to this patch, this
would result in `foo::A`. This is how the type printer would have,
by default, printed the canonical type of A as well.
As soon as you add any name qualifiers to A, the type printer would
suddenly start accurately printing the type as written. This patch
will make it print it accurately even when written without
qualifiers, so we will just print `A` for the initial example, as
the user did not really write that `foo::` namespace qualifier.
2) This patch could expose a bug in some AST matcher. Matching types
is harder to get right when there is sugar involved. For example,
if you want to match a type against being a pointer to some type A,
then you have to account for getting a type that is sugar for a
pointer to A, or being a pointer to sugar to A, or both! Usually
you would get the second part wrong, and this would work for a
very simple test where you don't use any name qualifiers, but
you would discover is broken when you do. The usual fix is to
either use the matcher which strips sugar, which is annoying
to use as for example if you match an N level pointer, you have
to put N+1 such matchers in there, beginning to end and between
all those levels. But in a lot of cases, if the property you want
to match is present in the canonical type, it's easier and faster
to just match on that... This goes with what is said in 1), if
you want to match against the name of a type, and you want
the name string to be something stable, perhaps matching on
the name of the canonical type is the better choice.
3) This patch could expose a bug in how you get the source range of some
TypeLoc. For some reason, a lot of code is using getLocalSourceRange(),
which only looks at the given TypeLoc node. This patch introduces a new,
and more common TypeLoc node which contains no source locations on itself.
This is not an inovation here, and some other, more rare TypeLoc nodes could
also have this property, but if you use getLocalSourceRange on them, it's not
going to return any valid locations, because it doesn't have any. The right fix
here is to always use getSourceRange() or getBeginLoc/getEndLoc which will dive
into the inner TypeLoc to get the source range if it doesn't find it on the
top level one. You can use getLocalSourceRange if you are really into
micro-optimizations and you have some outside knowledge that the TypeLocs you are
dealing with will always include some source location.
4) Exposed a bug somewhere in the use of the normal clang type class API, where you
have some type, you want to see if that type is some particular kind, you try a
`dyn_cast` such as `dyn_cast<TypedefType>` and that fails because now you have an
ElaboratedType which has a TypeDefType inside of it, which is what you wanted to match.
Again, like 2), this would usually have been tested poorly with some simple tests with
no qualifications, and would have been broken had there been any other kind of type sugar,
be it an ElaboratedType or a TemplateSpecializationType or a SubstTemplateParmType.
The usual fix here is to use `getAs` instead of `dyn_cast`, which will look deeper
into the type. Or use `getAsAdjusted` when dealing with TypeLocs.
For some reason the API is inconsistent there and on TypeLocs getAs behaves like a dyn_cast.
5) It could be a bug in this patch perhaps.
Let me know if you need any help!
Signed-off-by: Matheus Izvekov <mizvekov@gmail.com>
Differential Revision: https://reviews.llvm.org/D112374
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int incomplete = alignof ( Incomplete ( & ) [ ] ) ; // expected-error {{invalid application of 'alignof' to an incomplete type 'Incomplete'}}
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int complete = alignof ( Complete ( & ) [ ] ) ;
}
# endif
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namespace dr1310 { // dr1310: 5
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struct S { } * sp = new S : : S ; // expected-error {{qualified reference to 'S' is a constructor name}}
void f ( ) {
S : : S ( a ) ; // expected-error {{qualified reference to 'S' is a constructor name}}
}
struct T { int n ; typedef int U ; typedef T V ; } ;
int k = T ( ) . T : : T : : n ;
T : : V v ;
struct U { int U ; } ;
int u = U ( ) . U : : U ;
struct U : : U w ;
struct V : T : : T {
// FIXME: This is technically ill-formed, but we consider that to be a defect.
V ( ) : T : : T ( ) { }
} ;
template < typename T > struct VT : T : : T {
VT ( ) : T : : T ( ) { }
} ;
template struct VT < T > ;
template < template < typename > class > class TT { } ;
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template < typename > class TTy { } ;
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template < typename T > struct WBase { } ;
template < typename T > struct W : WBase < T > { typedef int X ; int n ; } ;
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void w_test ( ) {
W < int > : : W w1a ; // expected-error {{qualified reference to 'W' is a constructor name}}
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W < int > : : W : : X w1ax ;
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W < int > : : W < int > w1b ; // expected-error {{qualified reference to 'W' is a constructor name}}
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W < int > : : W < int > : : X w1bx ;
typename W < int > : : W w2a ; // expected-error {{qualified reference to 'W' is a constructor name}} expected-error 0-1{{outside of a template}}
typename W < int > : : W : : X w2ax ; // expected-error 0-1{{outside of a template}}
typename W < int > : : W < int > w2b ; // expected-error {{qualified reference to 'W' is a constructor name}} expected-error 0-1{{outside of a template}}
typename W < int > : : W < int > : : X w2bx ; // expected-error 0-1{{outside of a template}}
W < int > : : template W < int > w3 ; // expected-error {{qualified reference to 'W' is a constructor name}} expected-error 0-1{{outside of a template}}
W < int > : : template W < int > : : X w3x ; // expected-error 0-1{{outside of a template}}
typename W < int > : : template W < int > w4 ; // expected-error {{qualified reference to 'W' is a constructor name}} expected-error 0-2{{outside of a template}}
typename W < int > : : template W < int > : : X w4x ; // expected-error 0-2{{outside of a template}}
TT < W < int > : : W > tt1 ; // expected-error {{qualified reference to 'W' is a constructor name}}
TTy < W < int > : : W > tt1a ; // expected-error {{qualified reference to 'W' is a constructor name}}
TT < W < int > : : template W > tt2 ; // expected-error {{qualified reference to 'W' is a constructor name}} expected-error 0-1{{outside of a template}}
TT < W < int > : : WBase > tt3 ;
TTy < W < int > : : WBase > tt3a ;
TT < W < int > : : template WBase > tt4 ; // expected-error 0-1{{outside of a template}}
W < int > w ;
( void ) w . W : : W : : n ;
( void ) w . W < int > : : W : : n ;
( void ) w . W < int > : : W < int > : : n ;
( void ) w . W < int > : : template W < int > : : n ; // expected-error 0-1{{outside of a template}}
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}
template < typename W >
void wt_test ( ) {
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typename W : : W w2a ; // expected-error {{qualified reference to 'W' is a constructor name}}
typename W : : template W < int > w4 ; // expected-error {{qualified reference to 'W' is a constructor name}}
TTy < typename W : : W > tt2 ; // expected-error {{qualified reference to 'W' is a constructor name}}
TT < W : : template W > tt3 ; // expected-error {{qualified reference to 'W' is a constructor name}}
}
template < typename W >
void wt_test_good ( ) {
typename W : : W : : X w2ax ;
typename W : : template W < int > : : X w4x ;
TTy < typename W : : WBase > tt4 ;
TT < W : : template WBase > tt5 ;
W w ;
( void ) w . W : : W : : n ;
( void ) w . W : : template W < int > : : n ;
( void ) w . template W < int > : : W : : n ;
( void ) w . template W < int > : : template W < int > : : n ;
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}
template void wt_test < W < int > > ( ) ; // expected-note {{instantiation of}}
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template void wt_test_good < W < int > > ( ) ;
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}
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namespace dr1315 { // dr1315: partial
template < int I , int J > struct A { } ;
template < int I > // expected-note {{non-deducible template parameter 'I'}}
struct A < I + 5 , I * 2 > { } ; // expected-error {{contains a template parameter that cannot be deduced}}
template < int I > struct A < I , I > { } ;
template < int I , int J , int K > struct B ;
template < int I , int K > struct B < I , I * 2 , K > { } ; // expected-note {{matches}}
B < 1 , 2 , 3 > b1 ;
// Multiple declarations with the same dependent expression are equivalent
// for partial ordering purposes.
template < int I > struct B < I , I * 2 , 2 > { typedef int type ; } ;
B < 1 , 2 , 2 > : : type b2 ;
// Multiple declarations with differing dependent expressions are unordered.
template < int I , int K > struct B < I , I + 1 , K > { } ; // expected-note {{matches}}
B < 1 , 2 , 4 > b3 ; // expected-error {{ambiguous}}
// FIXME: Under dr1315, this is perhaps valid, but that is not clear: this
// fails the "more specialized than the primary template" test because the
// dependent type of T::value is not the same as 'int'.
// A core issue will be opened to decide what is supposed to happen here.
template < typename T , int I > struct C ;
template < typename T > struct C < T , T : : value > ;
// expected-error@-1 {{type of specialized non-type template argument depends on a template parameter of the partial specialization}}
}
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namespace dr1330 { // dr1330: 4 c++11
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// exception-specifications are parsed in a context where the class is complete.
struct A {
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void f ( ) throw ( T ) { } // expected-error 0-1{{C++17}} expected-note 0-1{{noexcept}}
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struct T { } ;
# if __cplusplus >= 201103L
void g ( ) noexcept ( & a = = b ) { }
static int a ;
static constexpr int * b = & a ;
# endif
} ;
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void ( A : : * af1 ) ( ) throw ( A : : T ) = & A : : f ; // expected-error 0-1{{C++17}} expected-note 0-1{{noexcept}}
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void ( A : : * af2 ) ( ) throw ( ) = & A : : f ; // expected-error-re {{{{not superset|different exception spec}}}}
# if __cplusplus >= 201103L
static_assert ( noexcept ( A ( ) . g ( ) ) , " " ) ;
# endif
// Likewise, they're instantiated separately from an enclosing class template.
template < typename U >
struct B {
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void f ( ) throw ( T , typename U : : type ) { } // expected-error 0-1{{C++17}} expected-note 0-1{{noexcept}}
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struct T { } ;
# if __cplusplus >= 201103L
void g ( ) noexcept ( & a = = b & & U : : value ) { }
static int a ;
static constexpr int * b = & a ;
# endif
} ;
B < int > bi ; // ok
struct P {
typedef int type ;
static const int value = true ;
} ;
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void ( B < P > : : * bpf1 ) ( ) throw ( B < P > : : T , int ) = & B < P > : : f ; // expected-error 0-1{{C++17}} expected-note 0-1{{noexcept}}
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# if __cplusplus < 201103L
// expected-error@-2 {{not superset}}
// FIXME: We only delay instantiation in C++11 onwards. In C++98, something
// weird happens: instantiation of B<P> fails because it references T before
// it's instantiated, but the diagnostic is suppressed in
// Sema::FindInstantiatedDecl because we've already hit an error. This is
// obviously a bad way to react to this situation; we should still producing
// the "T has not yet been instantiated" error here, rather than giving
// confusing errors later on.
# endif
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void ( B < P > : : * bpf2 ) ( ) throw ( int ) = & B < P > : : f ; // expected-error 0-1{{C++17}} expected-note 0-1{{noexcept}}
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# if __cplusplus <= 201402L
// expected-error@-2 {{not superset}}
# else
// expected-warning@-4 {{not superset}}
# endif
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void ( B < P > : : * bpf3 ) ( ) = & B < P > : : f ;
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void ( B < P > : : * bpf4 ) ( ) throw ( ) = & B < P > : : f ;
# if __cplusplus <= 201402L
// expected-error@-2 {{not superset}}
# else
// expected-error@-4 {{different exception specifications}}
# endif
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# if __cplusplus >= 201103L
static_assert ( noexcept ( B < P > ( ) . g ( ) ) , " " ) ;
struct Q { static const int value = false ; } ;
static_assert ( ! noexcept ( B < Q > ( ) . g ( ) ) , " " ) ;
# endif
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template < typename T > int f ( ) throw ( typename T : : error ) { return 0 ; } // expected-error 1-4{{prior to '::'}} expected-note 0-1{{prior to '::'}} expected-note 0-1{{requested here}}
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# if __cplusplus > 201402L
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// expected-error@-2 0-1{{C++17}} expected-note@-2 0-1{{noexcept}}
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# endif
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// An exception-specification is needed even if the function is only used in
// an unevaluated operand.
int f1 = sizeof ( f < int > ( ) ) ; // expected-note {{instantiation of}}
# if __cplusplus >= 201103L
decltype ( f < char > ( ) ) f2 ; // expected-note {{instantiation of}}
bool f3 = noexcept ( f < float > ( ) ) ; // expected-note {{instantiation of}}
# endif
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// In C++17 onwards, substituting explicit template arguments into the
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// function type substitutes into the exception specification (because it's
// part of the type). In earlier languages, we don't notice there's a problem
// until we've already started to instantiate.
template int f < short > ( ) ;
# if __cplusplus >= 201703L
// expected-error@-2 {{does not refer to a function template}}
# else
// expected-note@-4 {{instantiation of}}
# endif
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template < typename T > struct C {
C ( ) throw ( typename T : : type ) ; // expected-error 1-2{{prior to '::'}}
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# if __cplusplus > 201402L
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// expected-error@-2 0-1{{C++17}} expected-note@-2 0-1{{noexcept}}
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# endif
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} ;
struct D : C < void > { } ; // ok
# if __cplusplus < 201103L
// expected-note@-2 {{instantiation of}}
# endif
void f ( D & d ) { d = d ; } // ok
struct E : C < int > { } ; // expected-note {{in instantiation of}}
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# if __cplusplus >= 201103L
E e ; // expected-note {{needed here}}
# endif
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}
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namespace dr1346 { // dr1346: 3.5
auto a ( 1 ) ; // expected-error 0-1{{extension}}
auto b ( 1 , 2 ) ; // expected-error {{multiple expressions}} expected-error 0-1{{extension}}
# if __cplusplus >= 201103L
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auto c ( { } ) ; // expected-error {{parenthesized initializer list}}
auto d ( { 1 } ) ; // expected-error {{parenthesized initializer list}}
auto e ( { 1 , 2 } ) ; // expected-error {{parenthesized initializer list}}
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# endif
template < typename . . . Ts > void f ( Ts . . . ts ) { // expected-error 0-1{{extension}}
auto x ( ts . . . ) ; // expected-error {{empty}} expected-error 0-1{{extension}}
}
template void f ( ) ; // expected-note {{instantiation}}
# if __cplusplus >= 201103L
void init_capture ( ) {
[ a ( 1 ) ] { } ( ) ; // expected-error 0-1{{extension}}
[ b ( 1 , 2 ) ] { } ( ) ; // expected-error {{multiple expressions}} expected-error 0-1{{extension}}
# if __cplusplus >= 201103L
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[ c ( { } ) ] { } ( ) ; // expected-error {{parenthesized initializer list}} expected-error 0-1{{extension}}
[ d ( { 1 } ) ] { } ( ) ; // expected-error {{parenthesized initializer list}} expected-error 0-1{{extension}}
[ e ( { 1 , 2 } ) ] { } ( ) ; // expected-error {{parenthesized initializer list}} expected-error 0-1{{extension}}
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# endif
}
# endif
}
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namespace dr1347 { // dr1347: yes
auto x = 5 , * y = & x ; // expected-error 0-1{{extension}}
auto z = y , * q = y ; // expected-error {{'auto' deduced as 'int *' in declaration of 'z' and deduced as 'int' in declaration of 'q'}} expected-error 0-1{{extension}}
# if __cplusplus >= 201103L
auto a = 5 , b = { 1 , 2 } ; // expected-error {{'auto' deduced as 'int' in declaration of 'a' and deduced as 'std::initializer_list<int>' in declaration of 'b'}}
auto ( * fp ) ( int ) - > int , i = 0 ; // expected-error {{declaration with trailing return type must be the only declaration in its group}}
# endif
}
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namespace dr1358 { // dr1358: yes
# if __cplusplus >= 201103L
struct Lit { constexpr operator int ( ) const { return 0 ; } } ;
struct NonLit { NonLit ( ) ; operator int ( ) ; } ; // expected-note 2{{no constexpr constructors}}
struct NonConstexprConv { constexpr operator int ( ) const ; } ;
struct Virt { virtual int f ( int ) const ; } ;
template < typename T , typename U , typename V > struct A : V {
int member ;
constexpr A ( U u ) : member ( u ) { }
constexpr T f ( U u ) const { return T ( ) ; }
} ;
constexpr A < Lit , Lit , Lit > ce = Lit ( ) ;
constexpr int k = ce . f ( Lit { } ) ;
// Can have a non-literal return type and parameter type.
// Constexpr function can be implicitly virtual.
A < NonLit , NonLit , Virt > a = NonLit ( ) ;
void g ( ) { a . f ( NonLit ( ) ) ; }
// Constructor is still constexpr, so this is a literal type.
static_assert ( __is_literal_type ( decltype ( a ) ) , " " ) ;
// Constructor can call non-constexpr functions.
A < Lit , NonConstexprConv , Lit > b = NonConstexprConv ( ) ;
// But the corresponding non-template cases are rejected.
struct B : Virt {
int member ;
constexpr B ( NonLit u ) : member ( u ) { } // expected-error {{not a literal type}}
constexpr NonLit f ( NonLit u ) const { return NonLit ( ) ; } // expected-error {{not a literal type}}
} ;
# endif
}
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namespace dr1359 { // dr1359: 3.5
# if __cplusplus >= 201103L
union A { constexpr A ( ) = default ; } ;
union B { constexpr B ( ) = default ; int a ; } ; // expected-error {{not constexpr}} expected-note 2{{candidate}}
union C { constexpr C ( ) = default ; int a , b ; } ; // expected-error {{not constexpr}} expected-note 2{{candidate}}
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struct X { constexpr X ( ) = default ; union { } ; } ; // expected-error {{does not declare anything}}
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struct Y { constexpr Y ( ) = default ; union { int a ; } ; } ; // expected-error {{not constexpr}} expected-note 2{{candidate}}
constexpr A a = A ( ) ;
constexpr B b = B ( ) ; // expected-error {{no matching}}
constexpr C c = C ( ) ; // expected-error {{no matching}}
constexpr X x = X ( ) ;
constexpr Y y = Y ( ) ; // expected-error {{no matching}}
# endif
}
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namespace dr1388 { // dr1388: 4
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template < typename A , typename . . . T > void f ( T . . . , A ) ; // expected-note 1+{{candidate}} expected-error 0-1{{C++11}}
template < typename . . . T > void g ( T . . . , int ) ; // expected-note 1+{{candidate}} expected-error 0-1{{C++11}}
template < typename . . . T , typename A > void h ( T . . . , A ) ; // expected-note 1+{{candidate}} expected-error 0-1{{C++11}}
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void test_f ( ) {
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f ( 0 ) ; // ok, trailing parameter pack deduced to empty
f ( 0 , 0 ) ; // expected-error {{no matching}}
f < int > ( 0 ) ;
f < int > ( 0 , 0 ) ; // expected-error {{no matching}}
f < int , int > ( 0 , 0 ) ;
f < int , int , int > ( 0 , 0 ) ; // expected-error {{no matching}}
g ( 0 ) ;
g ( 0 , 0 ) ; // expected-error {{no matching}}
g < > ( 0 ) ;
g < int > ( 0 ) ; // expected-error {{no matching}}
g < int > ( 0 , 0 ) ;
h ( 0 ) ;
h ( 0 , 0 ) ; // expected-error {{no matching}}
h < int > ( 0 , 0 ) ;
h < int , int > ( 0 , 0 ) ; // expected-error {{no matching}}
}
// A non-trailing parameter pack is still a non-deduced context, even though
// we know exactly how many arguments correspond to it.
template < typename T , typename U > struct pair { } ;
template < typename . . . T > struct tuple { typedef char type ; } ; // expected-error 0-2{{C++11}}
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template < typename . . . T , typename . . . U > void f_pair_1 ( pair < T , U > . . . , int ) ; // expected-error 0-2{{C++11}} expected-note {{[with T = <int, long>]: deduced incomplete pack <(no value), (no value)> for template parameter 'U'}}
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template < typename . . . T , typename U > void f_pair_2 ( pair < T , char > . . . , U ) ; // expected-error 0-2{{C++11}}
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template < typename . . . T , typename . . . U > void f_pair_3 ( pair < T , U > . . . , tuple < U . . . > ) ; // expected-error 0-2{{C++11}} expected-note {{deduced packs of different lengths for parameter 'U' (<(no value), (no value)> vs. <char>)}}
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template < typename . . . T > void f_pair_4 ( pair < T , char > . . . , T . . . ) ; // expected-error 0-2{{C++11}} expected-note {{<int, long> vs. <int, long, const char *>}}
void g ( pair < int , char > a , pair < long , char > b , tuple < char , char > c ) {
f_pair_1 < int , long > ( a , b , 0 ) ; // expected-error {{no match}}
f_pair_2 < int , long > ( a , b , 0 ) ;
f_pair_3 < int , long > ( a , b , c ) ;
f_pair_3 < int , long > ( a , b , tuple < char > ( ) ) ; // expected-error {{no match}}
f_pair_4 < int , long > ( a , b , 0 , 0L ) ;
f_pair_4 < int , long > ( a , b , 0 , 0L , " foo " ) ; // expected-error {{no match}}
}
}
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namespace dr1391 { // dr1391: partial
struct A { } ; struct B : A { } ;
template < typename T > struct C { C ( int ) ; typename T : : error error ; } ; // expected-error 2{{'::'}}
template < typename T > struct D { } ;
// No deduction is performed for parameters with no deducible template-parameters, therefore types do not need to match.
template < typename T > void a ( T , int T : : * ) ;
void test_a ( int A : : * p ) { a ( A ( ) , p ) ; } // ok, type of second parameter does not need to match
namespace dr_example_1 {
template < typename T , typename U > void f ( C < T > ) ;
template < typename T > void f ( D < T > ) ;
void g ( D < int > d ) {
f ( d ) ; // ok, first 'f' eliminated by deduction failure
f < int > ( d ) ; // ok, first 'f' eliminated because 'U' cannot be deduced
}
}
namespace dr_example_2 {
template < typename T > typename C < T > : : error f ( int , T ) ;
template < typename T > T f ( T , T ) ;
void g ( A a ) {
f ( a , a ) ; // ok, no conversion from A to int for first parameter of first candidate
}
}
namespace std_example {
template < typename T > struct Z {
typedef typename T : : x xx ;
} ;
template < typename T > typename Z < T > : : xx f ( void * , T ) ;
template < typename T > void f ( int , T ) ;
struct A { } a ;
void g ( ) { f ( 1 , a ) ; }
}
template < typename T > void b ( C < int > ci , T * p ) ;
void b ( . . . ) ;
void test_b ( ) {
b ( 0 , 0 ) ; // ok, deduction fails prior to forming a conversion sequence and instantiating C<int>
// FIXME: The "while substituting" note should point at the overload candidate.
b < int > ( 0 , 0 ) ; // expected-note {{instantiation of}} expected-note {{while substituting}}
}
template < typename T > struct Id { typedef T type ; } ;
template < typename T > void c ( T , typename Id < C < T > > : : type ) ;
void test_c ( ) {
// Implicit conversion sequences for dependent types are checked later.
c ( 0.0 , 0 ) ; // expected-note {{instantiation of}}
}
namespace partial_ordering {
// FIXME: Second template should be considered more specialized because non-dependent parameter is ignored.
template < typename T > int a ( T , short ) = delete ; // expected-error 0-1{{extension}} expected-note {{candidate}}
template < typename T > int a ( T * , char ) ; // expected-note {{candidate}}
int test_a = a ( ( int * ) 0 , 0 ) ; // FIXME: expected-error {{ambiguous}}
// FIXME: Second template should be considered more specialized:
// deducing #1 from #2 ignores the second P/A pair, so deduction succeeds,
// deducing #2 from #1 fails to deduce T, so deduction fails.
template < typename T > int b ( T , int ) = delete ; // expected-error 0-1{{extension}} expected-note {{candidate}}
template < typename T , typename U > int b ( T * , U ) ; // expected-note {{candidate}}
int test_b = b ( ( int * ) 0 , 0 ) ; // FIXME: expected-error {{ambiguous}}
// Unintended consequences: because partial ordering does not consider
// explicit template arguments, and deduction from a non-dependent type
// vacuously succeeds, a non-dependent template is less specialized than
// anything else!
// According to DR1391, this is ambiguous!
template < typename T > int c ( int ) ;
template < typename T > int c ( T ) ;
int test_c1 = c ( 0 ) ; // ok
int test_c2 = c < int > ( 0 ) ; // FIXME: apparently ambiguous
}
}
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namespace dr1394 { // dr1394: 15
# if __cplusplus >= 201103L
struct Incomplete ;
Incomplete f ( Incomplete ) = delete ; // well-formed
# endif
}
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namespace dr1399 { // dr1399: dup 1388
template < typename . . . T > void f ( T . . . , int , T . . . ) { } // expected-note {{candidate}} expected-error 0-1{{C++11}}
void g ( ) {
f ( 0 ) ;
f < int > ( 0 , 0 , 0 ) ;
f ( 0 , 0 , 0 ) ; // expected-error {{no match}}
}
}
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namespace dr1307 { // dr1307: 14
# if __cplusplus >= 201103L
void f ( int const ( & ) [ 2 ] ) ;
void f ( int const ( & ) [ 3 ] ) ;
void caller ( ) {
// This should not be ambiguous, the 2nd overload is better.
f ( { 1 , 2 , 3 } ) ;
}
# endif // __cplusplus >= 201103L
} // namespace dr1307
