test/std/containers/unord/unord.map/unord.map.modifiers/emplace.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++03

// <unordered_map>

// template <class Key, class T, class Hash = hash<Key>, class Pred = equal_to<Key>,
//           class Alloc = allocator<pair<const Key, T>>>
// class unordered_map

// template <class... Args>
//     pair<iterator, bool> emplace(Args&&... args);

#include <unordered_map>
#include <cassert>

#include "test_macros.h"
#include "../../../Emplaceable.h"
#include "min_allocator.h"

int main(int, char**)
{
    {
        typedef std::unordered_map<int, Emplaceable> C;
        typedef std::pair<C::iterator, bool> R;
        C c;
        R r = c.emplace(std::piecewise_construct, std::forward_as_tuple(3),
                                                  std::forward_as_tuple());
        assert(r.second);
        assert(c.size() == 1);
        assert(r.first->first == 3);
        assert(r.first->second == Emplaceable());

        r = c.emplace(std::pair<const int, Emplaceable>(4, Emplaceable(5, 6)));
        assert(r.second);
        assert(c.size() == 2);
        assert(r.first->first == 4);
        assert(r.first->second == Emplaceable(5, 6));

        r = c.emplace(std::piecewise_construct, std::forward_as_tuple(5),
                                               std::forward_as_tuple(6, 7));
        assert(r.second);
        assert(c.size() == 3);
        assert(r.first->first == 5);
        assert(r.first->second == Emplaceable(6, 7));
    }
    {
        typedef std::unordered_map<int, Emplaceable, std::hash<int>, std::equal_to<int>,
                            min_allocator<std::pair<const int, Emplaceable>>> C;
        typedef std::pair<C::iterator, bool> R;
        C c;
        R r = c.emplace(std::piecewise_construct, std::forward_as_tuple(3),
                                                  std::forward_as_tuple());
        assert(r.second);
        assert(c.size() == 1);
        assert(r.first->first == 3);
        assert(r.first->second == Emplaceable());

        r = c.emplace(std::pair<const int, Emplaceable>(4, Emplaceable(5, 6)));
        assert(r.second);
        assert(c.size() == 2);
        assert(r.first->first == 4);
        assert(r.first->second == Emplaceable(5, 6));

        r = c.emplace(std::piecewise_construct, std::forward_as_tuple(5),
                                               std::forward_as_tuple(6, 7));
        assert(r.second);
        assert(c.size() == 3);
        assert(r.first->first == 5);
        assert(r.first->second == Emplaceable(6, 7));
    }

  return 0;
}