#include "X.h"

#include <boost/bind.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/thread/once.hpp>

X::X( int i)
: i_( i)
{}

int X::get_i()
{ return i_; }


struct Y
{
	boost::shared_ptr< X >	x_ptr;

	void init()
	{ x_ptr = boost::shared_ptr< X >( new X( 1) ); }

	Y()
	: x_ptr()
	{
		boost::once_flag f = BOOST_ONCE_INIT;
		boost::call_once( f, boost::bind( & Y::init, this) );
	}
};


X & get_default_X()
{
	static Y y;
	return * y.x_ptr.get();
}