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[libc++] Avoid unnecessary instantiations for __copy_cvref_t #123718

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merged 1 commit into from
Jan 22, 2025
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[libc++] Avoid unnecessary instantiations for __copy_cvref_t #123718

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21 changes: 12 additions & 9 deletions libcxx/include/__type_traits/copy_cvref.h
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Original file line number Diff line number Diff line change
Expand Up @@ -20,23 +20,26 @@

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _From, class _To>
template <class _From>
struct __copy_cvref {
using type = __copy_cv_t<_From, _To>;
template <class _To>
using __apply _LIBCPP_NODEBUG = __copy_cv_t<_From, _To>;
};

template <class _From, class _To>
struct __copy_cvref<_From&, _To> {
using type = __add_lvalue_reference_t<__copy_cv_t<_From, _To> >;
template <class _From>
struct __copy_cvref<_From&> {
template <class _To>
using __apply _LIBCPP_NODEBUG = __add_lvalue_reference_t<__copy_cv_t<_From, _To> >;
};

template <class _From, class _To>
struct __copy_cvref<_From&&, _To> {
using type = __add_rvalue_reference_t<__copy_cv_t<_From, _To> >;
template <class _From>
struct __copy_cvref<_From&&> {
template <class _To>
using __apply _LIBCPP_NODEBUG = __add_rvalue_reference_t<__copy_cv_t<_From, _To> >;
};

template <class _From, class _To>
using __copy_cvref_t _LIBCPP_NODEBUG = typename __copy_cvref<_From, _To>::type;
using __copy_cvref_t _LIBCPP_NODEBUG = typename __copy_cvref<_From>::template __apply<_To>;

_LIBCPP_END_NAMESPACE_STD

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