Endpoint

Endpoint is composed of "IP address + port":

basic_endpoint(const boost::asio::ip::address& addr, unsigned short port_num)
    : impl_(addr, port_num)
{
}

Client uses endpoint to designate server address, and server application uses endpoint to identify which address will be used to listen and accept connections. An example of creating TCP endpoint is like this:

boost::asio::ip::tcp::endpoint endpoint{
        boost::asio::ip::make_address("127.0.0.1"),
        3303};

Usually, the server needs to listen to all the address of current machine, and it can resort to another constructor of basic_endpoint:

basic_endpoint(const InternetProtocol& internet_protocol,
      unsigned short port_num)
    : impl_(internet_protocol.family(), port_num)
{
}

An example of creating and UDP server who listens to all IPv6 addresses:

boost::asio::ip::udp::endpoint endpoint{
        boost::asio::ip::udp::v6(),
        3303};