libstdc++-v3/testsuite/20_util/tuple/48476.cc

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2011-2020 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <tuple>
  21 #include <type_traits>
  22 #include <memory>
  23 #include <testsuite_hooks.h>
  24
  25 template<typename T>
  26   typename std::decay<T>::type copy(T&& x)
  27   { return std::forward<T>(x); }
  28
  29 // libstdc++/48476
  30 void test01()
  31 {
  32   std::shared_ptr<int> p(new int()), q, r;
  33
  34   std::tuple<std::shared_ptr<int>&, int>  t0(p, 23), t1(q, 0);
  35   t1 = copy(t0);  // shall be equivalent to
  36                   // q = p; std::get<1>(t1) = std::get<1>(t0);
  37   VERIFY( q == p );
  38
  39   std::tuple<std::shared_ptr<int>&, char> t2(r, 0);
  40   t2 = copy(t1);  // shall be equivalent to
  41                   // r = q; std::get<1>(t2) = std::get<1>(t1);
  42   VERIFY( r == q );
  43 }
  44
  45 int main()
  46 {
  47   test01();
  48   return 0;
  49 }