boost.log（二）过滤

#include <iostream>
#include <boost/log/core.hpp>
#include <boost/log/trivial.hpp>
#include <boost/log/expressions.hpp>
void init()
{
	boost::log::core::get()->set_filter(boost::log::trivial::severity >= boost::log::trivial::info);
}
int main(int, char*[])
{
	init();
	BOOST_LOG_TRIVIAL(trace) << "A trace severity message";
	BOOST_LOG_TRIVIAL(debug) << "A debug severity message";
	BOOST_LOG_TRIVIAL(info) << "An informational severity message";
	BOOST_LOG_TRIVIAL(warning) << "A warning severity message";
	BOOST_LOG_TRIVIAL(error) << "An error severity message";
	BOOST_LOG_TRIVIAL(fatal) << "A fatal severity message";
	system("pause");
	return 0;
}