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// Copyright (C) 2001-2003

// William E. Kempf

//

// Distributed under the Boost Software License, Version 1.0. (See accompanying

// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

#define BOOST_THREAD_PROVIDES_ONCE_CXX11

#include <boost/thread/thread.hpp>

#include <boost/thread/once.hpp>

#include <cassert>

int value=0;

#ifdef BOOST_THREAD_PROVIDES_ONCE_CXX11

static boost::once_flag once;

//static boost::once_flag once2 = BOOST_ONCE_INIT;

#else

static boost::once_flag once = BOOST_ONCE_INIT;

//static boost::once_flag once2 = once;

#endif

void init()

{

++value;

}

void thread_proc()

{

boost::call_once(&init, once);

}

int main()

{

boost::thread_group threads;

for (int i=0; i<5; ++i)

threads.create_thread(&thread_proc);

threads.join_all();

assert(value == 1);

}