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

// Copyright (C) 2008, 2009 Free Software Foundation

//

// 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/>.

// 20.8.13.2 Template class shared_ptr [util.smartptr.shared]

#include <memory>

#include <testsuite_hooks.h>

struct A { };

namespace std

{

  template<>

    struct less<A*> : binary_function<A*,A*,bool>

    {

      static int count;

      bool operator()(A* l, A* r) { ++count; return l < r; }

    };

  int less<A*>::count = 0;

}

// 20.8.13.2.7 shared_ptr comparison [util.smartptr.shared.cmp]

int

test01()

{

  bool test __attribute__((unused)) = true;

  std::less<std::shared_ptr<A>> less;

  // test empty shared_ptrs compare equivalent

  std::shared_ptr<A> p1;

  std::shared_ptr<A> p2;

  VERIFY( !less(p1, p2) && !less(p2, p1) );

  VERIFY( std::less<A*>::count == 2 );

  return 0;

}

// Construction from pointer

int

test02()

{

  bool test __attribute__((unused)) = true;

  std::less<std::shared_ptr<A>> less;

  std::shared_ptr<A> empty;

  std::shared_ptr<A> p1(new A);

  std::shared_ptr<A> p2(new A);

  VERIFY( less(p1, p2) || less(p2, p1) );

  VERIFY( !(less(p1, p2) && less(p2, p1)) );

  p1.reset();

  VERIFY( !less(p1, empty) && !less(empty, p1) );

  p2.reset();

  VERIFY( !less(p1, p2) && !less(p2, p1) );

  return 0;

}

// Aliasing

int

test03()

{

  bool test __attribute__((unused)) = true;

  std::less<std::shared_ptr<A>> less;

  A a;

  std::shared_ptr<A> p1(new A);

  std::shared_ptr<A> p2(p1, &a);

  VERIFY( less(p1, p2) || less(p2, p1) );

  return 0;

}

int

main()

{

  test01();

  test02();

  test03();

  return 0;

}