TheRock/compiler/amd-llvm/libcxx/test/std/containers/associative/map/compare.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
//
//===----------------------------------------------------------------------===//

// <map>

// template <class Key, class T, class Compare = less<Key>,
//           class Allocator = allocator<pair<const Key, T>>>
// class map // constexpr since C++26

// https://llvm.org/PR16538
// https://llvm.org/PR16549

#include <map>
#include <utility>
#include <cassert>

#include "test_macros.h"

struct Key {
  template <typename T>
  TEST_CONSTEXPR_CXX26 Key(const T&) {}
  TEST_CONSTEXPR_CXX26 bool operator<(const Key&) const { return false; }
};

TEST_CONSTEXPR_CXX26 bool test() {
  typedef std::map<Key, int> MapT;
  typedef MapT::iterator Iter;
  typedef std::pair<Iter, bool> IterBool;
  {
    MapT m_empty;
    MapT m_contains;
    m_contains[Key(0)] = 42;

    Iter it = m_empty.find(Key(0));
    assert(it == m_empty.end());
    it = m_contains.find(Key(0));
    assert(it != m_contains.end());
  }
  {
    MapT map;
    IterBool result = map.insert(std::make_pair(Key(0), 42));
    assert(result.second);
    assert(result.first->second == 42);
    IterBool result2 = map.insert(std::make_pair(Key(0), 43));
    assert(!result2.second);
    assert(map[Key(0)] == 42);
  }
  return true;
}

int main(int, char**) {
  test();
#if TEST_STD_VER >= 26
  static_assert(test());
#endif
  return 0;
}