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comparison gcc/testsuite/g++.dg/cpp0x/Wpessimizing-move3.C @ 131:84e7813d76e9

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gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
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111:04ced10e8804 131:84e7813d76e9
1 // PR c++/86981
2 // { dg-do compile { target c++11 } }
3 // { dg-options "-Wpessimizing-move" }
4
5 // Define std::move.
6 namespace std {
7 template<typename _Tp>
8 struct remove_reference
9 { typedef _Tp type; };
10
11 template<typename _Tp>
12 struct remove_reference<_Tp&>
13 { typedef _Tp type; };
14
15 template<typename _Tp>
16 struct remove_reference<_Tp&&>
17 { typedef _Tp type; };
18
19 template<typename _Tp>
20 constexpr typename std::remove_reference<_Tp>::type&&
21 move(_Tp&& __t) noexcept
22 { return static_cast<typename std::remove_reference<_Tp>::type&&>(__t); }
23 }
24
25 struct T { };
26 struct U { U(T); };
27
28 template<typename Tp>
29 T
30 fn1 ()
31 {
32 T t;
33 // Non-dependent type.
34 return std::move (t); // { dg-warning "moving a local object in a return statement prevents copy elision" }
35 }
36
37 template<typename Tp1, typename Tp2>
38 Tp1
39 fn2 ()
40 {
41 Tp2 t;
42 return std::move (t); // { dg-warning "moving a local object in a return statement prevents copy elision" }
43 }
44
45 template<typename Tp1, typename Tp2>
46 Tp1
47 fn3 ()
48 {
49 Tp2 t;
50 return std::move (t);
51 }
52
53 int
54 main ()
55 {
56 fn1<T>();
57 fn2<T, T>();
58 fn3<U, T>();
59 }