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 main()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