forward.pass.cpp revision 73d21a4f0774d3fadab98e690619a359cfb160a3 
1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// test forward
11
12#include <utility>
13#include <cassert>
14
15struct A
16{
17};
18
19A source() {return A();}
20const A csource() {return A();}
21
22typedef char one;
23struct two {one _[2];};
24struct four {one _[4];};
25struct eight {one _[8];};
26
27one test(A&);
28two test(const A&);
29
30#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
31
32four test(A&&);
33eight test(const A&&);
34
35#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
36
37int main()
38{
39    A a;
40    const A ca = A();
41
42#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
43    static_assert(sizeof(test(std::forward<A&>(a))) == 1, "");
44    static_assert(sizeof(test(std::forward<A>(a))) == 4, "");
45    static_assert(sizeof(test(std::forward<A>(source()))) == 4, "");
46
47    static_assert(sizeof(test(std::forward<const A&>(a))) == 2, "");
48//    static_assert(sizeof(test(std::forward<const A&>(source()))) == 2, "");
49    static_assert(sizeof(test(std::forward<const A>(a))) == 8, "");
50    static_assert(sizeof(test(std::forward<const A>(source()))) == 8, "");
51
52    static_assert(sizeof(test(std::forward<const A&>(ca))) == 2, "");
53//    static_assert(sizeof(test(std::forward<const A&>(csource()))) == 2, "");
54    static_assert(sizeof(test(std::forward<const A>(ca))) == 8, "");
55    static_assert(sizeof(test(std::forward<const A>(csource()))) == 8, "");
56
57#else  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
58
59    static_assert(sizeof(test(std::forward<A&>(a))) == 1, "");
60    static_assert(sizeof(test(std::forward<A>(a))) == 1, "");
61//    static_assert(sizeof(test(std::forward<A>(source()))) == 2, "");
62
63    static_assert(sizeof(test(std::forward<const A&>(a))) == 2, "");
64    static_assert(sizeof(test(std::forward<const A&>(source()))) == 2, "");
65    static_assert(sizeof(test(std::forward<const A>(a))) == 2, "");
66    static_assert(sizeof(test(std::forward<const A>(source()))) == 2, "");
67
68    static_assert(sizeof(test(std::forward<const A&>(ca))) == 2, "");
69    static_assert(sizeof(test(std::forward<const A&>(csource()))) == 2, "");
70    static_assert(sizeof(test(std::forward<const A>(ca))) == 2, "");
71    static_assert(sizeof(test(std::forward<const A>(csource()))) == 2, "");
72#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
73}
74