Is it possible to defer member initialization to the constructor body?

Question

I have a class with an object as a member which doesn\'t have a default constructor. I\'d like to initialize this member in the constructor, but it seems that in C++ I can\'

Answer 1

Another option in this case is to work around the issue by creating a static function to build ep:

#include 
#include 

using boost::asio::ip::udp;

template
class udp_sock
{
    public:
        udp_sock(std::string host, unsigned short port);
    private:
        static udp::endpoint build_ep(const std::string &host,
          unsigned short port, boost::asio::io_service &io_service);

        boost::asio::io_service _io_service;
        udp::socket _sock;
        boost::array _buf;
};

template
udp::endpoint udp_sock::build_ep(const std::string &host,
  unsigned short port, boost::asio::io_service &io_service)
{
    udp::resolver res(io_service);
    udp::resolver::query query(udp::v4(), host, "spec");
    udp::endpoint ep = *res.resolve(query);
    ep.port(port);
    return ep;
}

template
udp_sock::udp_sock(std::string host = "localhost",
  unsigned short port = 50000)
    : _sock(_io_service, build_ep(host, port, _io_service))
{
}