C++11 wrapper for XCB request-reply functions using variadic templates. Compilable example.

xpp

// g++ $(pkg-config --libs --cflags xcb) -std=c++11 -Wall xpp.cpp

#include <memory>
#include <xcb/xcb.h>

namespace xpp {

template<typename ... ARGS>
class Request {
  public:

    template<typename COOKIE, typename REPLY,
             COOKIE (*GET_COOKIE)(xcb_connection_t *, ARGS ...)>,
             REPLY *(*GET_REPLY)(xcb_connection_t *, COOKIE, xcb_generic_error_t **)>
    class Reply {
      public:
        Reply(xcb_connection_t * c, ARGS ... args) : m_c(c)
        {
          m_cookie = GET_COOKIE(m_c, args...);
        }

        const REPLY * const operator*(void)
        {
          if (! m_reply) {
            m_reply = std::shared_ptr<REPLY>(GET_REPLY(m_c, m_cookie, NULL));
          }
          return m_reply.get();
        }

        const REPLY * const operator->(void)
        {
          return *(*this);
        }

      private:
        xcb_connection_t * m_c;
        COOKIE m_cookie;
        std::shared_ptr<REPLY> m_reply;
    };
};

};

int main(int argc, char ** argv)
{
  xcb_connection_t * c;
  // ..

  xpp::Request<uint8_t, uint16_t, const char *>
     ::Reply<xcb_intern_atom_cookie_t, xcb_intern_atom_reply_t,
             &xcb_intern_atom, &xcb_intern_atom_reply>
    reply(c, 0, 6, "foobar");

  xcb_atom_t atom = (*reply)->atom;
             atom = reply->atom;

  return 0;
}