libstdc++-v3/testsuite/20_util/bind/60497.cc

   1 // { dg-do compile { target c++11 } }
   2
   3 // Copyright (C) 2014-2024 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 // libstdc++/60497
  21
  22 #include <functional>
  23 #include <memory>
  24
  25 struct A;
  26 template<typename T> struct B { T t; };
  27
  28 using UP = std::unique_ptr<B<A>>;
  29
  30 bool f(UP&, UP&) { return true; }
  31
  32 bool g(UP& p)
  33 {
  34   auto binder = std::bind(f, std::ref(p), std::placeholders::_1);
  35   bool b1 = binder(std::ref(p));
  36   auto binderbinder = std::bind(binder, std::placeholders::_1);
  37   bool b2 = binderbinder(std::ref(p));
  38   return b1 && b2;
  39 }