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// { dg-options "-std=gnu++0x" }
 
// Copyright (C) 2009, 2010 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/>.
 
// 25.2.11 random_shuffle()
 
// XXX FIXME:  parallel-mode should deal correctly with moveable-only types
// per C++0x, at minimum smoothly fall back to serial.
#undef _GLIBCXX_PARALLEL
 
#include <algorithm>
#include <testsuite_hooks.h>
#include <testsuite_iterators.h>
#include <testsuite_rvalref.h>
 
using __gnu_test::test_container;
using __gnu_test::random_access_iterator_wrapper;
using __gnu_test::rvalstruct;
 
typedef test_container<rvalstruct, random_access_iterator_wrapper> Container;
 
const int N = 200000;
int A[N];
 
void fill_ascending()
{
  for (int i = 0; i < N; ++i)
    A[i] = i;
}
 
void
test01()
{
  bool test __attribute__((unused)) = true;
 
  fill_ascending();
  rvalstruct rv[N];
  std::copy(A, A + N, rv);
  Container con(rv, rv + N);
  std::random_shuffle(con.begin(), con.end());
 
  // The chance that random_shuffle leaves the order as is by coincidence
  // is negligible, so we expect it to be permuted
  VERIFY( !std::equal(rv, rv + N, A) );
 
  std::sort(con.begin(), con.end());
  VERIFY( std::equal(rv, rv + N, A) );
}
 
int random_generator(int)
{ return 0; }
 
void
test02()
{
  bool test __attribute__((unused)) = true;
 
  fill_ascending();
  rvalstruct rv[10] = {1,2,3,4,5,6,7,8,9,10};
  int result[10] = {10,1,2,3,4,5,6,7,8,9};
  Container con(rv, rv + 10);
  std::random_shuffle(con.begin(), con.end(), random_generator);
  // The above answer was generated by hand. It is not required by the standard,
  // but is produced by the current algorithm.
  VERIFY( std::equal(rv, rv + 10, result) );
}
 
int
main()
{
  test01();
  test02();
  return 0;
}