cxx/test/containers/associative/map/map.modifiers/emplace_hint.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// <map>

// class map

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

#include <map>
#include <cassert>

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

int main()
{
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
    {
        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(), 1);
        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(), 1);
        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(), 2);
        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);
    }
#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
}