libcxx/test/std/containers/associative/set/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++98, c++03

// <set>

// class set

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

#include <set>
#include <cassert>

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

int main()
{
    {
        typedef std::set<DefaultOnly> M;
        typedef std::pair<M::iterator, bool> R;
        M m;
        assert(DefaultOnly::count == 0);
        R r = m.emplace();
        assert(r.second);
        assert(r.first == m.begin());
        assert(m.size() == 1);
        assert(*m.begin() == DefaultOnly());
        assert(DefaultOnly::count == 1);

        r = m.emplace();
        assert(!r.second);
        assert(r.first == m.begin());
        assert(m.size() == 1);
        assert(*m.begin() == DefaultOnly());
        assert(DefaultOnly::count == 1);
    }
    assert(DefaultOnly::count == 0);
    {
        typedef std::set<Emplaceable> M;
        typedef std::pair<M::iterator, bool> R;
        M m;
        R r = m.emplace();
        assert(r.second);
        assert(r.first == m.begin());
        assert(m.size() == 1);
        assert(*m.begin() == Emplaceable());
        r = m.emplace(2, 3.5);
        assert(r.second);
        assert(r.first == next(m.begin()));
        assert(m.size() == 2);
        assert(*r.first == Emplaceable(2, 3.5));
        r = m.emplace(2, 3.5);
        assert(!r.second);
        assert(r.first == next(m.begin()));
        assert(m.size() == 2);
        assert(*r.first == Emplaceable(2, 3.5));
    }
    {
        typedef std::set<int> M;
        typedef std::pair<M::iterator, bool> R;
        M m;
        R r = m.emplace(M::value_type(2));
        assert(r.second);
        assert(r.first == m.begin());
        assert(m.size() == 1);
        assert(*r.first == 2);
    }
    {
        typedef std::set<int, std::less<int>, min_allocator<int>> M;
        typedef std::pair<M::iterator, bool> R;
        M m;
        R r = m.emplace(M::value_type(2));
        assert(r.second);
        assert(r.first == m.begin());
        assert(m.size() == 1);
        assert(*r.first == 2);
    }
}