boost::signal2

// 忽略警告
#define _SCL_SECURE_NO_WARNINGS
#pragma warning(disable : 4996)
#include 
#include 
#include 
#include 
using namespace std;
#include 
#include 
#include 
void slots1()
{
	cout << "slots1 call:" << endl;
}


int slots2(int &a)
{
	cout << "slots2 call:    " << ++a << "    ok" << endl;
	return 2222;
}

int slots3(int &a)
{
	cout << "slots3 call:    " << a++ << "    ok" << endl;
	return 3333;
}

struct Hello
{
	void operator()() const
	{
		std::cout << "Hello" << endl;
	}
};

// 合并器
template
class Combiner1
{
	T v;
public:
	typedef std::pair result_type;
	Combiner1(T t = T()) :v(t){}

	template
	result_type operator()(InputIterator begin, InputIterator end) const
	{
		if (begin == end){ return result_type(); }
		vector vec(begin, end);
		T sum = std::accumulate(vec.begin(), vec.end(), v);	// 求和
		T max = *std::max_element(vec.begin(), vec.end());	// 最大值
		return result_type(sum, max);// retuen pair
	}
};

// 满足值大于30则终止迭代，不再调用剩余插槽
template
class Combiner2
{
	T v;
public:
	typedef void result_type;
	Combiner2(T t = T()) :v(t){}

	template
	result_type operator()(InputIterator begin, InputIterator end) const
	{
		while (begin != end)
		{
			if (*begin > 30)
				return;
			else
				++begin;
		}
		return;
	}
};

template
struct soltss 
{
	int operator()(int x)
	{
		cout << "slotss" << N << endl;
		return x * N;
	}
};


int main()
{
	boost::signals2::signal sig;// <> 中void为返回值类型，（）中是参数类型
	sig.connect(&slots1);// 绑定函数sig.connect(slots1);
	sig.connect(Hello());
	sig();// 触发函数   slots1 call:/Hello

	boost::signals2::signal sig1;
	// 参数1：组编号 可以缺省                                                            num值  和  调用顺序

	// 参数3：插入到该组的位置
	boost::signals2::connection s1 = sig1.connect(0, &slots2, boost::signals2::at_back);	// 5 2
	boost::signals2::connection s2 = sig1.connect(0, &slots3, boost::signals2::at_front);	// 7 1
	boost::signals2::connection s3 = sig1.connect(1, &slots2, boost::signals2::at_front);	// 8 3
	boost::signals2::connection s4 = sig1.connect(1, &slots3, boost::signals2::at_back);	// 8 4


	// 没有组号为 8 8 6 8   3 2 1 4
	int num = 5;
	cout << *sig1(num) << endl;// 输出 最后一个信号绑定的函数的返回值   3333

	{
		boost::signals2::shared_connection_block block(s1);// {}暂时阻塞信号
		cout << "信号数量：" << sig1.num_slots() << endl;//  数量为4
		s1.blocked() ? cout << "s1被阻塞" << endl : cout << "s1未被阻塞" << endl;//s1被阻塞
		num = 5;
		cout << *sig1(num) << endl;// 少s1的输出    577  3333

		block.unblock();// 重新启用信号
		s1.blocked() ? cout << "s1被阻塞" << endl : cout << "s1未被阻塞" << endl;//s1未被阻塞
		num = 5;
		cout << *sig1(num) << endl;// 正常输出
	}

	num = 5;
	cout << *sig1(num) << endl;

	s1.connected() ? cout << "s1已连接!" << endl : cout << "s1未连接!" << endl;// s1已连接!
	s1.disconnect();// 断开信号s1
	s1.connected() ? cout << "s1已连接!" << endl : cout << "s1未连接!" << endl;//s1未连接!
	cout << "信号数量：" << sig1.num_slots() << endl;// 3
	sig1.disconnect(0);// 断开组0所有信号
	cout << "信号数量：" << sig1.num_slots() << endl;// 2
	sig1.disconnect(&slots2);
	cout << "信号数量：" << sig1.num_slots() << endl;// 1
	sig1.disconnect_all_slots();// 断开所有信号
	cout << "信号数量：" << sig1.num_slots() << endl;// 0
	cout << sig1.empty() << endl;// true


	boost::signals2::signal sig2;
	sig2.connect(&slots2);
	cout << "信号数量：" << sig2.num_slots() << endl;// 1 
	{
		boost::signals2::scoped_connection sc = sig2.connect(&slots3);
		//sc.disconnect();
		sc.blocked() ? cout << "sc被阻塞" << endl : cout << "sc未被阻塞" << endl;//sc未被阻塞
		sc.connected() ? cout << "sc已连接!" << endl : cout << "sc未连接!" << endl;//sc已连接!
		cout << "信号数量：" << sig2.num_slots() << endl;// 2
		num = 5;
		cout << *sig2(num) << endl; // 6 6
		// 离开作用域 sc与sig2的连接自动断开
	}
	cout << "信号数量：" << sig2.num_slots() << endl;// 1


	// 合并器(得到和、最大值)
    // 默认合并器boost::signals2::optional_last_value
	typedef boost::signals2::signal> signal_t;
	signal_t sig3;
	sig3.connect(soltss<10>());
	boost::shared_ptr> ps(new soltss<100>);

	// 自动管理插槽的连接
	sig3.connect(signal_t::slot_type(boost::ref(*ps)).track(ps));
	assert(sig3.num_slots() == 2);
	ps.reset();// 销毁插槽, 该槽自动断开
	assert(sig3.num_slots() == 1);

	sig3.connect(soltss<20>());
	sig3.connect(soltss<50>());

	sig3(2);// slotss10 20 50
	//cout << res.first << "," << res.second << endl;// 160,100


	// slot - function - bind
	typedef boost::signals2::signal signal_t1;
	signal_t1 sig4;
	// 直接跟踪function
	boost::function funcc = boost::ref(slots2);
	//boost::function funcc = boost::bind(&slots2, _1);
	sig4.connect(funcc);
	// bind绑定
	sig4.connect(signal_t1::slot_type(&slots2,_1));// 类成员函数则  (类::函数名,对象/对象指针,占位符)
	num = 5;
	sig4(num);// 6 7
	getchar();
}