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

You could turn the _sock member into a smart pointer:

#include 
#include 
#include 

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

template
class udp_sock
{
    public:
        udp_sock(std::string host, unsigned short port);
    private:
        boost::asio::io_service _io_service;
        boost::scoped_ptr _sock_ptr;
        boost::array _buf;
};

template
udp_sock::udp_sock(std::string host = "localhost",
  unsigned short port = 50000)
{
    udp::resolver res(_io_service);
    udp::resolver::query query(udp::v4(), host, "spec");
    udp::endpoint ep = *res.resolve(query);
    ep.port(port);
    _sock_ptr.reset(new udp::socket(_io_service, ep));
}