diff options
Diffstat (limited to 'libcxx/include')
| -rw-r--r-- | libcxx/include/__functional_base | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/libcxx/include/__functional_base b/libcxx/include/__functional_base index 0d2c2fc6501..79017fe759b 100644 --- a/libcxx/include/__functional_base +++ b/libcxx/include/__functional_base @@ -548,16 +548,13 @@ template <class _Tp> void cref(const _Tp&&) = delete; #endif #if _LIBCPP_STD_VER > 11 -template <class _Tp1, class _Tp2 = void> -struct __is_transparent -{ -private: - struct __two {char __lx; char __lxx;}; - template <class _Up> static __two __test(...); - template <class _Up> static char __test(typename _Up::is_transparent* = 0); -public: - static const bool value = sizeof(__test<_Tp1>(0)) == 1; -}; +template <class _Tp, class, class = void> +struct __is_transparent : false_type {}; + +template <class _Tp, class _Up> +struct __is_transparent<_Tp, _Up, + typename __void_t<typename _Tp::is_transparent>::type> + : true_type {}; #endif // allocator_arg_t |
