text: //===----------------------------------------------------------------------===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  
  // UNSUPPORTED: c++03, c++11, c++14, c++17
  
  // template<class F, class... Args>
  // concept strict_weak_order;
  
  #include <concepts>
  
  static_assert(std::strict_weak_order<bool(int, int), int, int>);
  static_assert(std::strict_weak_order<bool(int, int), double, double>);
  static_assert(std::strict_weak_order<bool(int, double), double, double>);
  
  static_assert(!std::strict_weak_order<bool (*)(), int, double>);
  static_assert(!std::strict_weak_order<bool (*)(int), int, double>);
  static_assert(!std::strict_weak_order<bool (*)(double), int, double>);
  
  static_assert(!std::strict_weak_order<bool(double, double*), double, double*>);
  static_assert(!std::strict_weak_order<bool(int&, int&), double&, double&>);
  
  struct S1 {};
  static_assert(std::strict_weak_order<bool (S1::*)(S1*), S1*, S1*>);
  static_assert(std::strict_weak_order<bool (S1::*)(S1&), S1&, S1&>);
  
  struct S2 {};
  
  struct P1 {
    bool operator()(S1, S1) const;
  };
  static_assert(std::strict_weak_order<P1, S1, S1>);
  
  struct P2 {
    bool operator()(S1, S1) const;
    bool operator()(S1, S2) const;
  };
  static_assert(!std::strict_weak_order<P2, S1, S2>);
  
  struct P3 {
    bool operator()(S1, S1) const;
    bool operator()(S1, S2) const;
    bool operator()(S2, S1) const;
  };
  static_assert(!std::strict_weak_order<P3, S1, S2>);
  
  struct P4 {
    bool operator()(S1, S1) const;
    bool operator()(S1, S2) const;
    bool operator()(S2, S1) const;
    bool operator()(S2, S2) const;
  };
  static_assert(std::strict_weak_order<P4, S1, S2>);
  
  int main(int, char**) { return 0; }
  