test/std/experimental/utilities/propagate_const/propagate_const.nonmembers/propagate_const.relops/less_than.pass.cpp

//<=----------------------------------------------------------------------<=//
//
// 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++98, c++03, c++11

// <propagate_const>

// template <class T> constexpr bool operator<(const propagate_const<T>& x, const propagate_const<T>& y);
// template <class T> constexpr bool operator<(const T& x, const propagate_const<T>& y);
// template <class T> constexpr bool operator<(const propagate_const<T>& x, const T& y);

#include <experimental/propagate_const>
#include "test_macros.h"
#include "propagate_const_helpers.h"
#include <cassert>

using std::experimental::propagate_const;

constexpr bool operator<(const X &lhs, const X &rhs) {
  return lhs.i_ < rhs.i_;
}

int main(int, char**) {
  constexpr X x1_1(1);
  constexpr X x2_1(1);
  constexpr X x3_2(2);

  static_assert(!(x1_1 < x2_1), "");
  static_assert(x1_1 < x3_2, "");

  typedef propagate_const<X> P;

  constexpr P p1_1(1);
  constexpr P p2_1(1);
  constexpr P p3_2(2);

  static_assert(!(p1_1 < p2_1), "");
  static_assert(p1_1 < p3_2, "");

  static_assert(!(x1_1 < p1_1), "");
  static_assert(x1_1 < p3_2, "");

  static_assert(!(p1_1 < x1_1), "");
  static_assert(p1_1 < x3_2, "");

  return 0;
}