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| // Test diagnostics for ill-formed STL <compare> headers.
// RUN: %clang_cc1 -triple x86_64-apple-darwin -fcxx-exceptions -fsyntax-only -pedantic -verify -Wsign-compare -std=c++2a %s
void compare_not_found_test() {
// expected-error@+1 {{cannot deduce return type of 'operator<=>' because type 'std::partial_ordering' was not found; include <compare>}}
(void)(0.0 <=> 42.123);
}
namespace std {
inline namespace __1 {
struct partial_ordering; // expected-note {{forward declaration}}
}
} // namespace std
auto compare_incomplete_test() {
// expected-error@+1 {{incomplete type 'std::partial_ordering' where a complete type is required}}
return (-1.2 <=> 123.0);
}
namespace std {
inline namespace __1 {
struct partial_ordering {
unsigned value;
};
} // namespace __1
} // namespace std
auto missing_member_test() {
// expected-error@+1 {{standard library implementation of 'std::partial_ordering' is not supported; member 'equivalent' is missing}}
return (1.0 <=> 1.0);
}
namespace std {
inline namespace __1 {
struct strong_ordering {
long long value;
static const strong_ordering equivalent; // expected-note {{declared here}}
};
} // namespace __1
} // namespace std
auto test_non_constexpr_var() {
// expected-error@+1 {{standard library implementation of 'std::strong_ordering' is not supported; member 'equivalent' does not have expected form}}
return (1 <=> 0);
}
namespace std {
inline namespace __1 {
struct strong_equality {
char value = 0;
constexpr strong_equality() = default;
// non-trivial
constexpr strong_equality(strong_equality const &other) : value(other.value) {}
};
} // namespace __1
} // namespace std
struct Class {};
using MemPtr = void (Class::*)(int);
auto test_non_trivial(MemPtr LHS, MemPtr RHS) {
// expected-error@+1 {{standard library implementation of 'std::strong_equality' is not supported; the type is not trivially copyable}}
return LHS <=> RHS;
}
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