boost库之asio库， 定时器

#include <iostream>
using namespace std;

#include <boost/asio.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
using namespace boost;
using namespace boost::asio;

int main(int argc, char*argv[])
{
io_service ios;
deadline_timer t(ios, posix_time::seconds(3));

cout<<t.expires_from_now()<<", "<<t.expires_at()<<endl;

t.wait();
cout<<"hello"<<endl;

return 0;
}

#include <iostream>
using namespace std;

#include <boost/asio.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
using namespace boost;
using namespace boost::asio;

void print(const system::error_code& e)
{
cout<<"async hello."<<endl;
}

int main(int argc, char*argv[])
{
io_service ios;
deadline_timer t(ios, posix_time::seconds(3));

t.async_wait(print);

ios.run();

return 0;
}

#include <iostream>
using namespace std;

#include <boost/asio.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/bind.hpp>
using namespace boost;
using namespace boost::asio;

class a_timer
{
public:
template<typename F>
a_timer(io_service &ios, int c, F func) : count(0), max_count(c), t(ios, posix_time::millisec(500)), f(func)
{
t.async_wait(boost::bind(&a_timer::func_proc, this, boost::asio::placeholders::error));
}

void func_proc(const system::error_code& e)
{
if(count >= max_count)
return;

++count;

f();

t.expires_at(t.expires_at() + posix_time::millisec(500));
t.async_wait(boost::bind(&a_timer::func_proc, this, boost::asio::placeholders::error));
}

private:
int count, max_count;
deadline_timer t;
boost::function<void ()> f;
};

void print1()
{
cout<<"timer 1."<<endl;
}

void print2()
{
cout<<"timer 2."<<endl;
}

int main(int argc, char*argv[])
{
io_service ios;
a_timer a1(ios, 5, print1);
a_timer a2(ios, 3, print2);
ios.run();

return 0;
}