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Don't warn when using operator<=> with 0 #3581

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merged 6 commits into from
Mar 24, 2023
Merged

Don't warn when using operator<=> with 0 #3581

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3459b51
Don't warn when using operator<=> with 0
fsb4000 Mar 19, 2023
af5ee47
cannnot use _STL_VERIFY
fsb4000 Mar 19, 2023
cdba572
remove extra `_`
fsb4000 Mar 19, 2023
a40d721
Code review suggestions
fsb4000 Mar 21, 2023
e31e48b
Drop unnecessary forward declarations.
StephanTLavavej Mar 22, 2023
cc9f434
Use `GH-` for citation.
StephanTLavavej Mar 22, 2023
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15 changes: 13 additions & 2 deletions stl/inc/compare
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Original file line number Diff line number Diff line change
Expand Up @@ -27,8 +27,19 @@ _STL_DISABLE_CLANG_WARNINGS
#undef new

_STD_BEGIN
using _Literal_zero = decltype(nullptr);
using _Compare_t = signed char;
void _Literal_zero_is_expected();

struct _Literal_zero {
template <class _Ty, enable_if_t<is_same_v<_Ty, int>, int> = 0>
consteval _Literal_zero(_Ty _Zero) noexcept {
// Can't use _STL_VERIFY because this is a core header
if (_Zero != 0) {
_Literal_zero_is_expected();
}
}
};

using _Compare_t = signed char;

// These "pretty" enumerator names are safe since they reuse names of user-facing entities.
enum class _Compare_eq : _Compare_t { equal = 0, equivalent = equal };
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5 changes: 5 additions & 0 deletions tests/std/tests/P0768R1_spaceship_operator/test.cpp
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Expand Up @@ -7,6 +7,11 @@
#include <compare>
#include <type_traits>

// See GH-3581 for details
#ifdef __clang__
#pragma clang diagnostic error "-Wzero-as-null-pointer-constant"
#endif // __clang__

enum class comp { equal, less, greater, unordered };

template <comp Z, class T>
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