First Socket Program

#include <iostream>
#include <boost/asio.hpp>
#include <boost/algorithm/string/compare.hpp>
#include <boost/lexical_cast.hpp>

int main(int argc, const char* argv[])
{
    using boost::asio::ip::tcp;
    enum { PORT = 12580 };
    if ( argc == 2 && boost::is_iequal()(argv[1], (const char*)"server") == 0 )
    {
        boost::asio::io_service io_service;
        tcp::endpoint endpoint( tcp::v4(), PORT );
        tcp::acceptor acceptor( io_service, endpoint );

        tcp::iostream stream;
        boost::system::error_code ec;
        for (;;)
        {
            acceptor.accept( *stream.rdbuf(), ec );
            if (!ec)
                std::cout << stream.rdbuf();
            else
            {
                std::cerr << "链接已中断：" << stream.error().message() << std::endl;
                return 0;
            }
        }
    }
    else if ( argc == 3 && boost::is_iequal()(argv[1], (const char*)"client") == 0 )
    {
        tcp::iostream stream( argv[2], boost::lexical_cast<std::string>(PORT) );
        if (!stream)
        {
            std::cerr << "链接失败：" << stream.error().message() << std::endl;
            return 1;
        }

        std::string line;
        for (;;)
        {
            std::getline(std::cin, line);
            stream << line << std::endl;
        }
    }
    else
    {
        std::cerr << "用法：\n\t"<< argv[0] << " server / client <host>" << std::endl;
        return 1;
    }
}