llvm-project/clang/test/SemaCXX/constructor-initializer.cpp

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// RUN: %clang_cc1 -Wreorder -fsyntax-only -verify %s
class A {
int m;
public:
A() : A::m(17) { } // expected-error {{member initializer 'm' does not name a non-static data member or base class}}
A(int);
};
class B : public A {
public:
B() : A(), m(1), n(3.14) { }
private:
int m;
float n;
};
class C : public virtual B {
public:
C() : B() { }
};
class D : public C {
public:
D() : B(), C() { }
};
class E : public D, public B {
public:
E() : B(), D() { } // expected-error{{base class initializer 'B' names both a direct base class and an inherited virtual base class}}
};
typedef int INT;
class F : public B {
public:
int B;
F() : B(17),
m(17), // expected-error{{member initializer 'm' does not name a non-static data member or base class}}
INT(17) // expected-error{{constructor initializer 'INT' (aka 'int') does not name a class}}
{
}
};
class G : A {
G() : A(10); // expected-error{{expected '{'}}
};
void f() : a(242) { } // expected-error{{only constructors take base initializers}}
class H : A {
H();
};
H::H() : A(10) { }
class X {};
class Y {};
struct S : Y, virtual X {
S ();
};
struct Z : S {
Z() : X(), S(), E() {} // expected-error {{type 'E' is not a direct or virtual base of 'Z'}}
};
class U {
union { int a; char* p; };
union { int b; double d; };
U() : a(1), // expected-note {{previous initialization is here}}
p(0), // expected-error {{initializing multiple members of anonymous union}}
d(1.0) {}
};
struct V {};
struct Base {};
struct Base1 {};
struct Derived : Base, Base1, virtual V {
Derived ();
};
struct Current : Derived {
int Derived;
Current() : Derived(1), ::Derived(), // expected-warning {{field 'Derived' will be initialized after base '::Derived'}} \
// expected-warning {{base class '::Derived' will be initialized after base 'Derived::V'}}
::Derived::Base(), // expected-error {{type '::Derived::Base' is not a direct or virtual base of 'Current'}}
Derived::Base1(), // expected-error {{type 'Derived::Base1' is not a direct or virtual base of 'Current'}}
Derived::V(),
::NonExisting(), // expected-error {{member initializer 'NonExisting' does not name a non-static data member or}}
INT::NonExisting() {} // expected-error {{expected a class or namespace}} \
// expected-error {{member initializer 'NonExisting' does not name a non-static data member or}}
};
struct M { // expected-note 2 {{candidate constructor (the implicit copy constructor)}} \
// expected-note {{declared here}} \
// expected-note {{declared here}}
M(int i, int j); // expected-note 2 {{candidate constructor}}
};
struct N : M {
N() : M(1), // expected-error {{no matching constructor for initialization of 'M'}}
m1(100) { } // expected-error {{no matching constructor for initialization of 'M'}}
M m1;
};
struct P : M {
P() { } // expected-error {{constructor for 'P' must explicitly initialize the base class 'M' which does not have a default constructor}} \
// expected-error {{member 'm'}}
M m; // expected-note {{member is declared here}}
};
struct Q {
Rework base and member initialization in constructors, with several (necessarily simultaneous) changes: - CXXBaseOrMemberInitializer now contains only a single initializer rather than a set of initialiation arguments + a constructor. The single initializer covers all aspects of initialization, including constructor calls as necessary but also cleanup of temporaries created by the initializer (which we never handled before!). - Rework + simplify code generation for CXXBaseOrMemberInitializers, since we can now just emit the initializer as an initializer. - Switched base and member initialization over to the new initialization code (InitializationSequence), so that it - Improved diagnostics for the new initialization code when initializing bases and members, to match the diagnostics produced by the previous (special-purpose) code. - Simplify the representation of type-checked constructor initializers in templates; instead of keeping the fully-type-checked AST, which is rather hard to undo at template instantiation time, throw away the type-checked AST and store the raw expressions in the AST. This simplifies instantiation, but loses a little but of information in the AST. - When type-checking implicit base or member initializers within a dependent context, don't add the generated initializers into the AST, because they'll look like they were explicit. - Record in CXXConstructExpr when the constructor call is to initialize a base class, so that CodeGen does not have to infer it from context. This ensures that we call the right kind of constructor. There are also a few "opportunity" fixes here that were needed to not regress, for example: - Diagnose default-initialization of a const-qualified class that does not have a user-declared default constructor. We had this diagnostic specifically for bases and members, but missed it for variables. That's fixed now. - When defining the implicit constructors, destructor, and copy-assignment operator, set the CurContext to that constructor when we're defining the body. llvm-svn: 94952
2010-01-31 17:12:51 +08:00
Q() : f1(1,2), // expected-error {{excess elements in scalar initializer}}
pf(0.0) { } // expected-error {{cannot initialize a member subobject of type 'float *' with an rvalue of type 'double'}}
float f1;
float *pf;
};
// A silly class used to demonstrate field-is-uninitialized in constructors with
// multiple params.
class TwoInOne { public: TwoInOne(TwoInOne a, TwoInOne b) {} };
class InitializeUsingSelfTest {
bool A;
char* B;
int C;
TwoInOne D;
InitializeUsingSelfTest(int E)
: A(A), // expected-warning {{field is uninitialized when used here}}
B((((B)))), // expected-warning {{field is uninitialized when used here}}
C(A && InitializeUsingSelfTest::C), // expected-warning {{field is uninitialized when used here}}
D(D, // expected-warning {{field is uninitialized when used here}}
D) {} // expected-warning {{field is uninitialized when used here}}
};
int IntWrapper(int i) { return 0; };
class InitializeUsingSelfExceptions {
int A;
int B;
InitializeUsingSelfExceptions(int B)
: A(IntWrapper(A)), // Due to a conservative implementation, we do not report warnings inside function/ctor calls even though it is possible to do so.
B(B) {} // Not a warning; B is a local variable.
};
class CopyConstructorTest {
bool A, B, C;
CopyConstructorTest(const CopyConstructorTest& rhs)
: A(rhs.A),
B(B), // expected-warning {{field is uninitialized when used here}}
C(rhs.C || C) { } // expected-warning {{field is uninitialized when used here}}
};
// Make sure we aren't marking default constructors when we shouldn't be.
template<typename T>
struct NDC {
T &ref;
NDC() { }
NDC(T &ref) : ref(ref) { }
};
struct X0 : NDC<int> {
X0(int &ref) : NDC<int>(ref), ndc(ref) { }
NDC<int> ndc;
};
namespace Test0 {
struct A { A(); };
struct B {
B() { }
const A a;
};
}