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// test forward 11 12#include <utility> 13#include <cassert> 14 15#include "test_macros.h" 16 17struct A 18{ 19}; 20 21A source() {return A();} 22const A csource() {return A();} 23 24typedef char one; 25struct two {one _[2];}; 26struct four {one _[4];}; 27struct eight {one _[8];}; 28 29one test(A&); 30two test(const A&); 31 32int main() 33{ 34 A a; 35 const A ca = A(); 36 37 ((void)a); // Prevent unused warning 38 ((void)ca); // Prevent unused warning 39 40#if TEST_STD_VER < 11 41 static_assert(sizeof(test(std::forward<A&>(a))) == 1, ""); 42 static_assert(sizeof(test(std::forward<A>(a))) == 1, ""); 43 44 // Libc++'s C++03 implementation of 'forward' cannot accept true non-const 45 // rvalues. 46 // static_assert(sizeof(test(std::forward<A>(source()))) == 2, ""); 47 48 static_assert(sizeof(test(std::forward<const A&>(a))) == 2, ""); 49 static_assert(sizeof(test(std::forward<const A&>(source()))) == 2, ""); 50 static_assert(sizeof(test(std::forward<const A>(a))) == 2, ""); 51 static_assert(sizeof(test(std::forward<const A>(source()))) == 2, ""); 52 53 static_assert(sizeof(test(std::forward<const A&>(ca))) == 2, ""); 54 static_assert(sizeof(test(std::forward<const A&>(csource()))) == 2, ""); 55 static_assert(sizeof(test(std::forward<const A>(ca))) == 2, ""); 56 static_assert(sizeof(test(std::forward<const A>(csource()))) == 2, ""); 57#endif 58} 59