// { dg-do compile }

// Copyright (C) 2007-2023 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/>.
//

#include <map>

// libstdc++/31440
struct DagNode
{ };

class MemoTable
{
public:
  void memoRewrite();

private:
  struct dagNodeLt;
  class MemoMap;

  MemoMap* memoMap;
};

struct MemoTable::dagNodeLt
{
  bool operator()(const DagNode*, const DagNode*) const;
};

class MemoTable::MemoMap
: public std::map<DagNode*, DagNode*, MemoTable::dagNodeLt>
{ };

void
MemoTable::memoRewrite()
{
  memoMap->find(0);
}