default-constructor-initializers.cpp
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// RUN: %clang_cc1 -fsyntax-only -verify %s
// RUN: %clang_cc1 -fsyntax-only -verify -std=c++98 %s
// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
struct X1 { // has no implicit default constructor
X1(int);
};
struct X2 : X1 {
#if __cplusplus <= 199711L
// expected-note@-2 2 {{'X2' declared here}}
#endif
X2(int);
};
struct X3 : public X2 {
#if __cplusplus <= 199711L
// expected-error@-2 {{implicit default constructor for 'X3' must explicitly initialize the base class 'X2' which does not have a default constructor}}
#else
// expected-note@-4 {{default constructor of 'X3' is implicitly deleted because base class 'X2' has no default constructor}}
#endif
};
X3 x3;
#if __cplusplus <= 199711L
// expected-note@-2 {{first required here}}
#else
// expected-error@-4 {{call to implicitly-deleted default constructor of 'X3'}}
#endif
struct X4 {
#if __cplusplus <= 199711L
// expected-error@-2 {{must explicitly initialize the member 'x2'}}
// expected-error@-3 {{must explicitly initialize the reference member 'rx2'}}
#endif
X2 x2;
#if __cplusplus <= 199711L
// expected-note@-2 {{member is declared here}}
#else
// expected-note@-4 {{default constructor of 'X4' is implicitly deleted because field 'x2' has no default constructor}}
#endif
X2 & rx2;
#if __cplusplus <= 199711L
// expected-note@-2 {{declared here}}
#endif
};
X4 x4;
#if __cplusplus <= 199711L
// expected-note@-2 {{first required here}}
#else
// expected-error@-4 {{call to implicitly-deleted default constructor of 'X4'}}
#endif
struct Y1 { // has no implicit default constructor
Y1(int);
};
struct Y2 : Y1 {
Y2(int);
Y2();
};
struct Y3 : public Y2 {
};
Y3 y3;
struct Y4 {
Y2 y2;
};
Y4 y4;
// More tests
struct Z1 {
#if __cplusplus <= 199711L
// expected-error@-2 {{must explicitly initialize the reference member 'z'}}
// expected-error@-3 {{must explicitly initialize the const member 'c1'}}
#endif
int& z;
#if __cplusplus <= 199711L
// expected-note@-2 {{declared here}}
#else
// expected-note@-4 {{default constructor of 'Z1' is implicitly deleted because field 'z' of reference type 'int &' would not be initialized}}
#endif
const int c1;
#if __cplusplus <= 199711L
// expected-note@-2 {{declared here}}
#endif
volatile int v1;
};
// Test default initialization which *requires* a constructor call for non-POD.
Z1 z1;
#if __cplusplus <= 199711L
// expected-note@-2 {{first required here}}
#else
// expected-error@-4 {{call to implicitly-deleted default constructor of 'Z1'}}
#endif
// Ensure that value initialization doesn't use trivial implicit constructors.
namespace PR7948 {
// Note that this is also non-POD to ensure we don't just special case PODs.
struct S { const int x; ~S(); };
const S arr[2] = { { 42 } };
}
// This is valid
union U {
const int i;
float f;
};
U u;