1//===----------------------------------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is dual licensed under the MIT and the University of Illinois Open 6// Source Licenses. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10// UNSUPPORTED: c++98, c++03 11 12// <queue> 13 14// template <class... Args> reference emplace(Args&&... args); 15// return type is 'reference' in C++17; 'void' before 16 17 18#include <queue> 19#include <cassert> 20 21#include "test_macros.h" 22 23#include "../../../Emplaceable.h" 24 25int main() 26{ 27 typedef Emplaceable T; 28 std::queue<Emplaceable> q; 29#if TEST_STD_VER > 14 30 T& r1 = q.emplace(1, 2.5); 31 assert(&r1 == &q.back()); 32 T& r2 = q.emplace(2, 3.5); 33 assert(&r2 == &q.back()); 34 T& r3 = q.emplace(3, 4.5); 35 assert(&r3 == &q.back()); 36 assert(&r1 == &q.front()); 37#else 38 q.emplace(1, 2.5); 39 q.emplace(2, 3.5); 40 q.emplace(3, 4.5); 41#endif 42 43 assert(q.size() == 3); 44 assert(q.front() == Emplaceable(1, 2.5)); 45 assert(q.back() == Emplaceable(3, 4.5)); 46} 47