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explicit functions that are not candidates. It's not always obvious that the reason a conversion was not possible is because the function you wanted to call is 'explicit', so explicitly say if that's the case. It would be nice to rank the explicit candidates higher in the diagnostic if an implicit conversion sequence exists for their arguments, but unfortunately we can't determine that without potentially triggering non-immediate-context errors that we're not permitted to produce.
79 lines
2.0 KiB
C++
79 lines
2.0 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify %s
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// RUN: %clang_cc1 -fsyntax-only -verify -std=c++98 %s
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// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
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struct ConvToBool {
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operator bool() const;
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};
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struct ConvToInt {
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operator int();
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};
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struct ExplicitConvToBool {
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explicit operator bool(); // expected-note {{explicit}}
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#if __cplusplus <= 199711L // C++03 or earlier modes
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// expected-warning@-2{{explicit conversion functions are a C++11 extension}}
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#endif
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};
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void test_conv_to_bool(ConvToBool ctb, ConvToInt cti, ExplicitConvToBool ecb) {
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if (ctb) { }
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if (cti) { }
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if (ecb) { }
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for (; ctb; ) { }
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for (; cti; ) { }
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for (; ecb; ) { }
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while (ctb) { };
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while (cti) { }
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while (ecb) { }
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do { } while (ctb);
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do { } while (cti);
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do { } while (ecb);
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if (!ctb) { }
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if (!cti) { }
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if (!ecb) { }
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bool b1 = !ecb;
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if (ctb && ecb) { }
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bool b2 = ctb && ecb;
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if (ctb || ecb) { }
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bool b3 = ctb || ecb;
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}
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void accepts_bool(bool) { } // expected-note{{candidate function}}
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struct ExplicitConvToRef {
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explicit operator int&(); // expected-note {{explicit}}
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#if (__cplusplus <= 199711L) // C++03 or earlier modes
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// expected-warning@-2{{explicit conversion functions are a C++11 extension}}
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#endif
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};
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void test_explicit_bool(ExplicitConvToBool ecb) {
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bool b1(ecb); // okay
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bool b2 = ecb; // expected-error{{no viable conversion from 'ExplicitConvToBool' to 'bool'}}
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accepts_bool(ecb); // expected-error{{no matching function for call to}}
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}
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void test_explicit_conv_to_ref(ExplicitConvToRef ecr) {
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int& i1 = ecr; // expected-error{{no viable conversion from 'ExplicitConvToRef' to 'int'}}
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int& i2(ecr); // okay
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}
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struct A { };
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struct B { };
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struct C {
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explicit operator A&(); // expected-note {{explicit}}
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#if __cplusplus <= 199711L // C++03 or earlier modes
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// expected-warning@-2{{explicit conversion functions are a C++11 extension}}
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#endif
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operator B&(); // expected-note{{candidate}}
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};
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void test_copy_init_conversions(C c) {
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A &a = c; // expected-error{{no viable conversion from 'C' to 'A'}}
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B &b = c; // okay
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}
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