libcxx/test/std/utilities/function.objects/comparisons/transparent_three_way.compile.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // UNSUPPORTED: c++03, c++11, c++14, c++17
  10
  11 #include <functional>
  12
  13 template<class T>
  14 concept Transparent = requires {
  15     typename T::is_transparent;
  16 };
  17
  18 static_assert(Transparent<std::compare_three_way>);