test/std/containers/unord/unord.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

// <unordered_set>

// template <class Value, class Hash = hash<Value>, class Pred = equal_to<Value>,
//           class Alloc = allocator<Value>>
// class unordered_set

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

#include <unordered_set>
#include <cassert>

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

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

        r = c.emplace(Emplaceable(5, 6));
        assert(c.size() == 2);
        assert(*r.first == Emplaceable(5, 6));
        assert(r.second);

        r = c.emplace(5, 6);
        assert(c.size() == 2);
        assert(*r.first == Emplaceable(5, 6));
        assert(!r.second);
    }
    {
        typedef std::unordered_set<Emplaceable, std::hash<Emplaceable>,
                      std::equal_to<Emplaceable>, min_allocator<Emplaceable>> C;
        typedef std::pair<C::iterator, bool> R;
        C c;
        R r = c.emplace();
        assert(c.size() == 1);
        assert(*r.first == Emplaceable());
        assert(r.second);

        r = c.emplace(Emplaceable(5, 6));
        assert(c.size() == 2);
        assert(*r.first == Emplaceable(5, 6));
        assert(r.second);

        r = c.emplace(5, 6);
        assert(c.size() == 2);
        assert(*r.first == Emplaceable(5, 6));
        assert(!r.second);
    }

  return 0;
}