boost bind copy parameter

bind_copy_parameter.cc

/*
 * test_bind.cc
 *
 *  Created on: Aug 10, 2014
 *      Author: damonhao
 */

#include <boost/shared_ptr.hpp>
#include <boost/bind.hpp>
#include <boost/function.hpp>

using namespace std;

typedef boost::shared_ptr<int> intPtr;

void haha(intPtr& a)
{
	cout << a.use_count() << endl;
	a.reset();
}

int main()
{

	intPtr ptr(new int(1));
	intPtr& ptr1 = ptr;
	cout << ptr.use_count() << endl;
	boost::function<void()> f1;
	f1 = boost::bind(haha, ptr1);
	f1();
	cout << ptr.use_count() << endl;
	return 0;
}

/*
output
1
2
1
*/