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// Copyright (C) 2011 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 3, 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 COPYING3.  If not see

// <http://www.gnu.org/licenses/>.

//

// { dg-do compile }

// { dg-options "-std=gnu++0x" }

#include <unordered_map>

struct X

{

  template<typename T>

  X(T&) {}

};

struct X_hash

{ std::size_t operator()(const X&) const { return 0; } };

bool operator==(const X&, const X&) { return false; }

// LWG 2059.

void erasor(std::unordered_map<X, int, X_hash>& s, X x)

{

  std::unordered_map<X, int, X_hash>::iterator it = s.find(x);

  if (it != s.end())

    s.erase(it);

}