libstdc++-v3/testsuite/20_util/function_objects/mem_fn/68982.cc

   1 // Copyright (C) 2015-2023 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-do compile { target c++11 } }
  19
  20 #include <functional>
  21
  22 namespace n
  23 {
  24   template<typename T> struct identity { using type = T; };
  25
  26   template<typename T>
  27     T&&
  28     forward(typename identity<T>::type& t)
  29     { return static_cast<T&&>(t); }
  30
  31   struct X { };
  32 }
  33
  34 struct server
  35 {
  36   void action(n::X) { }
  37
  38   void act() {
  39     auto f = std::mem_fn(&server::action);
  40     n::X x;
  41     f(this, x);
  42   }
  43 };
  44