* eventxx::dispatcher& d;
* int i;
* handler(eventxx::dispatcher& d): d(d), i(0) {}
- * void operator() (int signum, short event)
+ * void operator() (int signum, eventxx::type event)
* {
* if (i < 5) std::cout << "keep going...\n";
* else
* @section Status
*
* This library has not been widely used yet, so it lacks proper testing.
- * Because templates are not even compiled when they are not used, don't have to
- * be surprised if you catch a piece of code that doesn't compile. The library
+ * Because templates are not even compiled when they are not used, don't be
+ * surprised if you catch a piece of code that doesn't compile. The library
* has no support for buffered events yet. It doesn't support the HTTP stuff,
* and probably never will because that has nothing to do with event handling.
*
*
* @author Leandro Lucarella <llucax+eventxx@gmail.com>
*
- * @version 0.1
+ * @version 0.4
*
* @par License
* This program is under the BOLA license (see
* callbacks.
*/
+/** @example wrapped-functor-way.cpp
+ *
+ * This is a simple example illustrating the usage with an arbitrary member
+ * function as an event handler callbacks.
+ */
+
/** @example mixed-way.cpp
*
* This is a simple example illustrating the usage with a mix of C-like callbacks
};
-/// C function used as callback in the C API.
-typedef void (*ccallback_type)(int, short, void*);
-
-
/**
* Time used for timeout values.
*
* function objects (see eventxx::event, eventxx::timer and eventxx::signal
* templates). The former are just typedef'ed specialization of the later.
*
+ * A member function wrapper functor (eventxx::mem_cb) is also included,
+ * so you can use any member function (method) as an event handler.
+ *
+ * Please note that C-like function callback take a short as the type of event,
+ * while functors (or member functions) use eventxx::type.
+ *
* All events derive from a plain class (not template) eventxx::basic_event, one
* of the main utilities of it (besides containing common code ;) is to be used
* in STL containers.
*/
//@{
+
+/// C function used as callback in the C API.
+typedef void (*ccallback_type)(int, short, void*);
+
+
/**
* Type of events.
*
PERSIST = EV_PERSIST ///< Not really an event, is an event modifier.
};
+type operator| (const type& t1, const type& t2)
+{
+ int r = static_cast< int >(t1) | static_cast< int >(t2);
+ return *reinterpret_cast< type* >(&r);
+}
+
+
/**
* Basic event from which all events derive.
*
* @param ev Type of events to monitor (see eventxx::type).
* @param handler Callback functor.
*/
- event(int fd, short ev, F& handler) throw()
+ event(int fd, type ev, F& handler) throw()
{
- event_set(this, fd, ev, &wrapper,
+ event_set(this, fd, static_cast< short >(ev), &wrapper,
reinterpret_cast< void* >(&handler));
}
* @param handler C-style callback function.
* @param arg Arbitrary pointer to pass to the handler as argument.
*/
- event(int fd, short ev, ccallback_type handler, void* arg = 0) throw()
+ event(int fd, type ev, ccallback_type handler, void* arg = 0) throw()
{
- event_set(this, fd, ev, handler, arg);
+ event_set(this, fd, static_cast< short >(ev), handler, arg);
}
protected:
/// Shortcut to C-style signal handler.
typedef eventxx::signal< ccallback_type > csignal;
+/**
+ * Helper functor to use an arbitrary member function as an event handler.
+ *
+ * With this wrapper, you can use any object method, which accepts the right
+ * parameters (int, short) and returns void, as an event handler. This way you
+ * don't have to overload the operator() which can be confusing depending on the
+ * context.
+ *
+ * You can see an usage example in the Examples Section.
+ */
+template < typename O, typename M >
+struct mem_cb
+{
+
+ /**
+ * Member function callback constructor.
+ *
+ * It expects to receive a class as the first parameter (O), and a
+ * member function (of that class O) as the second parameter.
+ *
+ * When this instance is called with fd and ev as function arguments,
+ * object.method(fd, ev) will be called.
+ *
+ * @param object Object to be used.
+ * @param method Method to be called.
+ */
+ mem_cb(O& object, M method) throw():
+ _object(object), _method(method) {}
+
+ void operator() (int fd, type ev) { (_object.*_method)(fd, ev); }
+ protected:
+ O& _object;
+ M _method;
+
+}; // struct mem_cb
//@}
template < typename F >
void add_once(int fd, type ev, F& handler)
{
- internal::event_once(fd, ev, &dispatcher::wrapper< F >,
- reinterpret_cast< void* >(&handler), 0);
+ internal::event_once(fd, static_cast< short>(ev),
+ &dispatcher::wrapper< F >,
+ reinterpret_cast< void* >(&handler), 0);
}
/**
*/
void add_once(int fd, type ev, ccallback_type handler, void* arg)
{
- internal::event_once(fd, ev, handler, arg, 0);
+ internal::event_once(fd, static_cast< short >(ev), handler,
+ arg, 0);
}
/**
template < typename F >
void add_once(int fd, type ev, F& handler, const time& to)
{
- internal::event_once(fd, ev, &dispatcher::wrapper< F >,
- reinterpret_cast< void* >(&handler),
- // XXX HACK libevent don't use const
- const_cast< time* >(&to));
+ internal::event_once(fd, static_cast< short >(ev),
+ &dispatcher::wrapper< F >,
+ reinterpret_cast< void* >(&handler),
+ // XXX HACK libevent don't use const
+ const_cast< time* >(&to));
}
/**
void add_once(int fd, type ev, ccallback_type handler, void* arg,
const time& to)
{
- internal::event_once(fd, ev, handler, arg,
+ internal::event_once(fd, static_cast< short >(ev), handler, arg,
// XXX HACK libevent don't use const
const_cast< time* >(&to));
}
protected:
internal::event_base* _event_base;
template < typename F >
- static void wrapper(int fd, type ev, void* h)
+ static void wrapper(int fd, short ev, void* h)
{
F& handler = *reinterpret_cast< F* >(h);
handler(fd, *reinterpret_cast< type* >(&ev));
}; // struct dispatcher
-
-} // namespace event
+} // namespace eventxx
#endif // _EVENTXX_HPP_
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