llvm-project/libcxx/test/std/containers/associative/map/map.modifiers/emplace_hint.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

// <map>

// class map

// template <class... Args>
//   iterator emplace_hint(const_iterator position, Args&&... args);

#include <map>
#include <cassert>

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

int main(int, char**)
{
    {
        typedef std::map<int, DefaultOnly> M;
        typedef M::iterator R;
        M m;
        assert(DefaultOnly::count == 0);
        R r = m.emplace_hint(m.end());
        assert(r == m.begin());
        assert(m.size() == 1);
        assert(m.begin()->first == 0);
        assert(m.begin()->second == DefaultOnly());
        assert(DefaultOnly::count == 1);
        r = m.emplace_hint(m.end(), std::piecewise_construct,
                                       std::forward_as_tuple(1),
                                       std::forward_as_tuple());
        assert(r == next(m.begin()));
        assert(m.size() == 2);
        assert(next(m.begin())->first == 1);
        assert(next(m.begin())->second == DefaultOnly());
        assert(DefaultOnly::count == 2);
        r = m.emplace_hint(m.end(), std::piecewise_construct,
                                       std::forward_as_tuple(1),
                                       std::forward_as_tuple());
        assert(r == next(m.begin()));
        assert(m.size() == 2);
        assert(next(m.begin())->first == 1);
        assert(next(m.begin())->second == DefaultOnly());
        assert(DefaultOnly::count == 2);
    }
    assert(DefaultOnly::count == 0);
    {
        typedef std::map<int, Emplaceable> M;
        typedef M::iterator R;
        M m;
        R r = m.emplace_hint(m.end(), std::piecewise_construct,
                                       std::forward_as_tuple(2),
                                       std::forward_as_tuple());
        assert(r == m.begin());
        assert(m.size() == 1);
        assert(m.begin()->first == 2);
        assert(m.begin()->second == Emplaceable());
        r = m.emplace_hint(m.end(), std::piecewise_construct,
                                    std::forward_as_tuple(1),
                                    std::forward_as_tuple(2, 3.5));
        assert(r == m.begin());
        assert(m.size() == 2);
        assert(m.begin()->first == 1);
        assert(m.begin()->second == Emplaceable(2, 3.5));
        r = m.emplace_hint(m.end(), std::piecewise_construct,
                                    std::forward_as_tuple(1),
                                    std::forward_as_tuple(2, 3.5));
        assert(r == m.begin());
        assert(m.size() == 2);
        assert(m.begin()->first == 1);
        assert(m.begin()->second == Emplaceable(2, 3.5));
    }
    {
        typedef std::map<int, double> M;
        typedef M::iterator R;
        M m;
        R r = m.emplace_hint(m.end(), M::value_type(2, 3.5));
        assert(r == m.begin());
        assert(m.size() == 1);
        assert(m.begin()->first == 2);
        assert(m.begin()->second == 3.5);
    }
    {
        typedef std::map<int, DefaultOnly, std::less<int>, min_allocator<std::pair<const int, DefaultOnly>>> M;
        typedef M::iterator R;
        M m;
        assert(DefaultOnly::count == 0);
        R r = m.emplace_hint(m.end());
        assert(r == m.begin());
        assert(m.size() == 1);
        assert(m.begin()->first == 0);
        assert(m.begin()->second == DefaultOnly());
        assert(DefaultOnly::count == 1);
        r = m.emplace_hint(m.end(), std::piecewise_construct,
                                       std::forward_as_tuple(1),
                                       std::forward_as_tuple());
        assert(r == next(m.begin()));
        assert(m.size() == 2);
        assert(next(m.begin())->first == 1);
        assert(next(m.begin())->second == DefaultOnly());
        assert(DefaultOnly::count == 2);
        r = m.emplace_hint(m.end(), std::piecewise_construct,
                                       std::forward_as_tuple(1),
                                       std::forward_as_tuple());
        assert(r == next(m.begin()));
        assert(m.size() == 2);
        assert(next(m.begin())->first == 1);
        assert(next(m.begin())->second == DefaultOnly());
        assert(DefaultOnly::count == 2);
    }
    assert(DefaultOnly::count == 0);
    {
        typedef std::map<int, Emplaceable, std::less<int>, min_allocator<std::pair<const int, Emplaceable>>> M;
        typedef M::iterator R;
        M m;
        R r = m.emplace_hint(m.end(), std::piecewise_construct,
                                       std::forward_as_tuple(2),
                                       std::forward_as_tuple());
        assert(r == m.begin());
        assert(m.size() == 1);
        assert(m.begin()->first == 2);
        assert(m.begin()->second == Emplaceable());
        r = m.emplace_hint(m.end(), std::piecewise_construct,
                                    std::forward_as_tuple(1),
                                    std::forward_as_tuple(2, 3.5));
        assert(r == m.begin());
        assert(m.size() == 2);
        assert(m.begin()->first == 1);
        assert(m.begin()->second == Emplaceable(2, 3.5));
        r = m.emplace_hint(m.end(), std::piecewise_construct,
                                    std::forward_as_tuple(1),
                                    std::forward_as_tuple(2, 3.5));
        assert(r == m.begin());
        assert(m.size() == 2);
        assert(m.begin()->first == 1);
        assert(m.begin()->second == Emplaceable(2, 3.5));
    }
    {
        typedef std::map<int, double, std::less<int>, min_allocator<std::pair<const int, double>>> M;
        typedef M::iterator R;
        M m;
        R r = m.emplace_hint(m.end(), M::value_type(2, 3.5));
        assert(r == m.begin());
        assert(m.size() == 1);
        assert(m.begin()->first == 2);
        assert(m.begin()->second == 3.5);
    }

  return 0;
}