47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// UNSUPPORTED: c++98, c++03
|
|
|
|
// <queue>
|
|
|
|
// template <class... Args> reference emplace(Args&&... args);
|
|
// return type is 'reference' in C++17; 'void' before
|
|
|
|
|
|
#include <queue>
|
|
#include <cassert>
|
|
|
|
#include "test_macros.h"
|
|
|
|
#include "../../../Emplaceable.h"
|
|
|
|
int main()
|
|
{
|
|
typedef Emplaceable T;
|
|
std::queue<Emplaceable> q;
|
|
#if TEST_STD_VER > 14
|
|
T& r1 = q.emplace(1, 2.5);
|
|
assert(&r1 == &q.back());
|
|
T& r2 = q.emplace(2, 3.5);
|
|
assert(&r2 == &q.back());
|
|
T& r3 = q.emplace(3, 4.5);
|
|
assert(&r3 == &q.back());
|
|
assert(&r1 == &q.front());
|
|
#else
|
|
q.emplace(1, 2.5);
|
|
q.emplace(2, 3.5);
|
|
q.emplace(3, 4.5);
|
|
#endif
|
|
|
|
assert(q.size() == 3);
|
|
assert(q.front() == Emplaceable(1, 2.5));
|
|
assert(q.back() == Emplaceable(3, 4.5));
|
|
}
|