1 // Copyright (C) 2018-2019 Free Software Foundation, Inc.
2 //
3 // This file is part of the GNU ISO C++ Library.  This library is free
4 // software; you can redistribute it and/or modify it under the
5 // terms of the GNU General Public License as published by the
6 // Free Software Foundation; either version 3, or (at your option)
7 // any later version.
8 
9 // This library is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 // GNU General Public License for more details.
13 
14 // You should have received a copy of the GNU General Public License along
15 // with this library; see the file COPYING3.  If not see
16 // <http://www.gnu.org/licenses/>.
17 
18 // { dg-options "-std=gnu++17" }
19 // { dg-do compile { target c++17 } }
20 
21 #include <functional>
22 
23 void
test01()24 test01()
25 {
26   int i = 0;
27   std::reference_wrapper rw0(i);
28   [[maybe_unused]] std::reference_wrapper<int>* p0 = &rw0;
29   [[maybe_unused]] int& r0 = rw0;
30 
31   std::reference_wrapper rw1(rw0);
32   [[maybe_unused]] std::reference_wrapper<int>* p1 = &rw1;
33   [[maybe_unused]] int& r1 = rw1;
34 }
35 
36 void
test02()37 test02()
38 {
39   const int i = 0;
40   std::reference_wrapper rw0(i);
41   [[maybe_unused]] std::reference_wrapper<const int>* p0 = &rw0;
42 
43   std::reference_wrapper rw1(rw0);
44   [[maybe_unused]] std::reference_wrapper<const int>* p1 = &rw1;
45 }
46