直白点说，就是对getaddrinfo()这个函数的适配。抽象点说就是解析器。
细节如下：
boost::asio::ip::tcp::resolver resolver(asioService);
boost::asio::ip::tcp::resolver::query queryEndpoints(boost::asio::ip::host_name(),"80");
boost::asio::ip::tcp::resolver::iterator endpoint_iterator = resolver.resolve(queryEndpoints);
;
for(boost::asio::ip::tcp::resolver::iterator iterNull;
endpoint_iterator != iterNull;
endpoint_iterator++)
{
std::cout << endpoint_iterator->endpoint() << std::endl;
}
上面的代码有这么几个类型：
boost::asio::ip::tcp::resolver
boost::asio::ip::tcp::resolver::query
boost::asio::ip::tcp::resolver::iterator
resolver抽线的是getaddrinfo()动作
boost::asio::ip::tcp::resolver::query抽象的是getaddrinfo()需要的参数
boost::asio::ip::tcp::resolver::iterator抽象的是getaddrinfo()的结果
这整个体系是抽象winsock sdk到stl思想