1*3df094d3SArthur O'Dwyer //===----------------------------------------------------------------------===//
2*3df094d3SArthur O'Dwyer //
3*3df094d3SArthur O'Dwyer // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4*3df094d3SArthur O'Dwyer // See https://llvm.org/LICENSE.txt for license information.
5*3df094d3SArthur O'Dwyer // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6*3df094d3SArthur O'Dwyer //
7*3df094d3SArthur O'Dwyer //===----------------------------------------------------------------------===//
8*3df094d3SArthur O'Dwyer 
9*3df094d3SArthur O'Dwyer // UNSUPPORTED: c++03, c++11, c++14, c++17
10*3df094d3SArthur O'Dwyer 
11*3df094d3SArthur O'Dwyer #include <functional>
12*3df094d3SArthur O'Dwyer 
13*3df094d3SArthur O'Dwyer template<class T>
14*3df094d3SArthur O'Dwyer concept Transparent = requires {
15*3df094d3SArthur O'Dwyer     typename T::is_transparent;
16*3df094d3SArthur O'Dwyer };
17*3df094d3SArthur O'Dwyer 
18*3df094d3SArthur O'Dwyer static_assert(Transparent<std::compare_three_way>);
19