// 2001-04-06 gdr// Copyright (C) 2000, 2005 Free Software Foundation, Inc.//// This file is part of the GNU ISO C++ Library. This library is free// software; you can redistribute it and/or modify it under the// terms of the GNU General Public License as published by the// Free Software Foundation; either version 2, or (at your option)// any later version.// This library is distributed in the hope that it will be useful,// but WITHOUT ANY WARRANTY; without even the implied warranty of// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the// GNU General Public License for more details.// You should have received a copy of the GNU General Public License along// with this library; see the file COPYING. If not, write to the Free// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,// USA.#include <vector>#include <algorithm>//// 25.1.8 Make sure std::equal doesn't make any extra assumption// about operator== and operator!=//struct X { };bool operator==(X, X) { return true; }// Not implemented on purpose. { dg-do link }bool operator!=(X, X);int main(){std::vector<X> v, w;return !std::equal(v.begin(), v.end(), w.begin());}