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 // <stack> 13 14 // template <class... Args> reference emplace(Args&&... args); 15 // return type is 'reference' in C++17; 'void' before 16 17 #include <stack> 18 #include <cassert> 19 20 #include "test_macros.h" 21 22 #include "../../../Emplaceable.h" 23 main()24int main() 25 { 26 typedef Emplaceable T; 27 std::stack<Emplaceable> q; 28 #if TEST_STD_VER > 14 29 T& r1 = q.emplace(1, 2.5); 30 assert(&r1 == &q.top()); 31 T& r2 = q.emplace(2, 3.5); 32 assert(&r2 == &q.top()); 33 T& r3 = q.emplace(3, 4.5); 34 assert(&r3 == &q.top()); 35 #else 36 q.emplace(1, 2.5); 37 q.emplace(2, 3.5); 38 q.emplace(3, 4.5); 39 #endif 40 assert(q.size() == 3); 41 assert(q.top() == Emplaceable(3, 4.5)); 42 } 43