test/std/containers/associative/multimap/multimap.cons/default_noexcept.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
//
//===----------------------------------------------------------------------===//

// <map>

// multimap()
//    noexcept(
//        is_nothrow_default_constructible<allocator_type>::value &&
//        is_nothrow_default_constructible<key_compare>::value &&
//        is_nothrow_copy_constructible<key_compare>::value);

// This tests a conforming extension

// UNSUPPORTED: c++98, c++03

#include <map>
#include <cassert>

#include "test_macros.h"
#include "MoveOnly.h"
#include "test_allocator.h"

template <class T>
struct some_comp
{
    typedef T value_type;
    some_comp();
    bool operator()(const T&, const T&) const { return false; }
};

int main()
{
    typedef std::pair<const MoveOnly, MoveOnly> V;
#if defined(_LIBCPP_VERSION)
    {
        typedef std::multimap<MoveOnly, MoveOnly> C;
        static_assert(std::is_nothrow_default_constructible<C>::value, "");
    }
    {
        typedef std::multimap<MoveOnly, MoveOnly, std::less<MoveOnly>, test_allocator<V>> C;
        static_assert(std::is_nothrow_default_constructible<C>::value, "");
    }
#endif // _LIBCPP_VERSION
    {
        typedef std::multimap<MoveOnly, MoveOnly, std::less<MoveOnly>, other_allocator<V>> C;
        static_assert(!std::is_nothrow_default_constructible<C>::value, "");
    }
    {
        typedef std::multimap<MoveOnly, MoveOnly, some_comp<MoveOnly>> C;
        static_assert(!std::is_nothrow_default_constructible<C>::value, "");
    }
}