convert-to-bool.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 ConvToBool {
operator bool() const;
};
struct ConvToInt {
operator int();
};
struct ExplicitConvToBool {
explicit operator bool(); // expected-note {{explicit}}
#if __cplusplus <= 199711L // C++03 or earlier modes
// expected-warning@-2{{explicit conversion functions are a C++11 extension}}
#endif
};
void test_conv_to_bool(ConvToBool ctb, ConvToInt cti, ExplicitConvToBool ecb) {
if (ctb) { }
if (cti) { }
if (ecb) { }
for (; ctb; ) { }
for (; cti; ) { }
for (; ecb; ) { }
while (ctb) { };
while (cti) { }
while (ecb) { }
do { } while (ctb);
do { } while (cti);
do { } while (ecb);
if (!ctb) { }
if (!cti) { }
if (!ecb) { }
bool b1 = !ecb;
if (ctb && ecb) { }
bool b2 = ctb && ecb;
if (ctb || ecb) { }
bool b3 = ctb || ecb;
}
void accepts_bool(bool) { } // expected-note{{candidate function}}
struct ExplicitConvToRef {
explicit operator int&(); // expected-note {{explicit}}
#if (__cplusplus <= 199711L) // C++03 or earlier modes
// expected-warning@-2{{explicit conversion functions are a C++11 extension}}
#endif
};
void test_explicit_bool(ExplicitConvToBool ecb) {
bool b1(ecb); // okay
bool b2 = ecb; // expected-error{{no viable conversion from 'ExplicitConvToBool' to 'bool'}}
accepts_bool(ecb); // expected-error{{no matching function for call to}}
}
void test_explicit_conv_to_ref(ExplicitConvToRef ecr) {
int& i1 = ecr; // expected-error{{no viable conversion from 'ExplicitConvToRef' to 'int'}}
int& i2(ecr); // okay
}
struct A { };
struct B { };
struct C {
explicit operator A&(); // expected-note {{explicit}}
#if __cplusplus <= 199711L // C++03 or earlier modes
// expected-warning@-2{{explicit conversion functions are a C++11 extension}}
#endif
operator B&(); // expected-note{{candidate}}
};
void test_copy_init_conversions(C c) {
A &a = c; // expected-error{{no viable conversion from 'C' to 'A'}}
B &b = c; // okay
}