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[libcxx] removes unnecessary traits from has_unique_object_representations #69241

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May 21, 2024
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[libcxx] removes unnecessary traits from has_unique_object_representations #69241

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[libcxx] removes unnecessary traits from `has_unique_object_represent…
cjdb Oct 16, 2023
0edd6b6
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ldionne Apr 12, 2024
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6 changes: 2 additions & 4 deletions libcxx/include/__type_traits/has_unique_object_representation.h
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Original file line number Diff line number Diff line change
Expand Up @@ -11,8 +11,6 @@

#include <__config>
#include <__type_traits/integral_constant.h>
#include <__type_traits/remove_all_extents.h>
#include <__type_traits/remove_cv.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
Expand All @@ -24,10 +22,10 @@ _LIBCPP_BEGIN_NAMESPACE_STD

template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS has_unique_object_representations
: public integral_constant<bool, __has_unique_object_representations(remove_cv_t<remove_all_extents_t<_Tp>>)> {};
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I assume you've checked that we have tests for const arrays or w/e to make sure the patch is still exercised.

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Yes to both questions, but I wouldn't be upset if someone wanted to double check the tests' existence.

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There is libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/has_unique_object_representations.pass.cpp, but we seem to be missing a test for a multi-dimensional array.

: public integral_constant<bool, __has_unique_object_representations(_Tp)> {};

template <class _Tp>
inline constexpr bool has_unique_object_representations_v = has_unique_object_representations<_Tp>::value;
inline constexpr bool has_unique_object_representations_v = __has_unique_object_representations(_Tp);

#endif

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2 changes: 2 additions & 0 deletions .../std/utilities/meta/meta.unary/meta.unary.prop/has_unique_object_representations.pass.cpp
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Expand Up @@ -99,6 +99,8 @@ int main(int, char**)
test_has_unique_object_representations<unsigned>();
test_has_unique_object_representations<NonEmptyUnion>();
test_has_unique_object_representations<char[3]>();
test_has_unique_object_representations<char[3][4]>();
test_has_unique_object_representations<char[3][4][5]>();
test_has_unique_object_representations<char[]>();


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