boost thread

#include <cassert>
#include <iostream>

#include <boost/ref.hpp>
#include <boost/thread.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/atomic.hpp>
#include <boost/bind.hpp>

using namespace std;
using namespace boost;

void double_int(int & i){
	i *= 2;
}

int f(int a,int b){
	return a+b;
}
int g(int a,int b,int c){
	return a+b*c;
}

struct A{
	int add(int a,int b){
		return a+b;
	}
};

mutex io_mu;

void printing(atomic_int& x, const string& str){
	for(int i=0;i<5;++i){
		mutex::scoped_lock lock(io_mu);
		cout<<this_thread::get_id()<<":"<< str<<++x<<endl;
		this_thread::sleep_for(chrono::seconds(1));
	}
}

int main(){
	/*
	A a;
	int r3 = boost::bind(&A::add, a, 1, 2)();
	auto r4 = boost::bind(&A::add, a, _1, 20)(100);
	cout<<r3<<endl;
	cout<<r4<<endl;
	//cout<<typeid(r4).name()<<endl;
	*/
	/*
	int r1 = boost::bind(f,_1,_2)(11,22);
	int r2 = boost::bind(g,_3,_2,_1)(10,2,3);
	cout<<"r1="<<r1<<",r2="<<r2<<endl;
	*/

	atomic_int x(0);
	auto e1 = boost::bind(printing, boost::ref(x), "hello");
	auto e2 = boost::bind(printing, boost::ref(x), "boost");

	thread_group tg;
	tg.create_thread(e1);
	tg.create_thread(e2);
	tg.join_all();

	/*
	atomic_int x(0);
	auto e1 = boost::bind(printing, boost::ref(x), "hello");
	auto e2 = boost::bind(printing, boost::ref(x), "boost");

	thread t1(e1);
	thread t2(e2);

	t1.join();
	t2.join();
	*/

	//this_thread::sleep_for(chrono::seconds(2));

	/*
	int i = 10;
	cout<<i<<endl;
	double_int(ref(i));
	cout<<i<<endl;
	*/
	/*
	int x = 10;
	reference_wrapper<int> rw(x);
	assert( x == rw);
	(int &)rw =  100;
	cout<<"rw="<<rw<<endl;
	cout<<"x="<<x<<endl;

	reference_wrapper<int> rw2(rw);
	(int &)rw2 = 101;
	cout<<"rw="<<rw<<endl;
	cout<<"x="<<x<<endl;

	auto rw3 = ref(x);
	cout<< typeid(rw3).name()<<endl;

	auto rw4 = cref(x);
	cout<< typeid(rw4).name()<<endl;
	*/
	std::system("pause");
	return 0;
}