libev/ev%2B%2B.h

#ifndef EVPP_H__
#define EVPP_H__

#include "ev.h"

namespace ev {

  template<class watcher>
  class callback
  {
    struct object { };

    void *obj;
    void (object::*meth)(watcher &, int);

    /* a proxy is a kind of recipe on how to call a specific class method */
    struct proxy_base {
      virtual void call (void *obj, void (object::*meth)(watcher &, int), watcher &w, int) const = 0;
    };
    template<class O1, class O2>
    struct proxy : proxy_base {
      virtual void call (void *obj, void (object::*meth)(watcher &, int), watcher &w, int e) const
      {
        ((reinterpret_cast<O1 *>(obj)) ->* (reinterpret_cast<void (O2::*)(watcher &, int)>(meth)))
          (w, e);
      }
    };

    proxy_base *prxy;

  public:
    template<class O1, class O2>
    explicit callback (O1 *object, void (O2::*method)(watcher &, int))
    {
      static proxy<O1,O2> p;
      obj  = reinterpret_cast<void *>(object);
      meth = reinterpret_cast<void (object::*)(watcher &, int)>(method);
      prxy = &p;
    }

    void call (watcher *w, int e) const
    {
      return prxy->call (obj, meth, *w, e);
    }
  };

  enum {
    UNDEF    = EV_UNDEF,
    NONE     = EV_NONE,
    READ     = EV_READ,
    WRITE    = EV_WRITE,
    TIMEOUT  = EV_TIMEOUT,
    PERIODIC = EV_PERIODIC,
    SIGNAL   = EV_SIGNAL,
    CHILD    = EV_CHILD,
    STAT     = EV_STAT,
    IDLE     = EV_IDLE,
    CHECK    = EV_CHECK,
    PREPARE  = EV_PREPARE,
    FORK     = EV_FORK,
    EMBED    = EV_EMBED,
    ERROR    = EV_ERROR,
  };

  typedef ev_tstamp tstamp;

  inline ev_tstamp now (EV_P)
  {
    return ev_now (EV_A);
  }

  #if EV_MULTIPLICITY

    #define EV_CONSTRUCT(cppstem)                                                       \
      EV_P;                                                                             \
                                                                                        \
      void set (EV_P)                                                                   \
      {                                                                                 \
        this->EV_A = EV_A;                                                              \
      }                                                                                 \
                                                                                        \
      template<class O1, class O2>                                                      \
      explicit cppstem (O1 *object, void (O2::*method)(cppstem &, int), EV_P = ev_default_loop (0)) \
      : callback<cppstem> (object, method), EV_A (EV_A)

  #else

    #define EV_CONSTRUCT(cppstem)                                                       \
      template<class O1, class O2>                                                      \
      explicit cppstem (O1 *object, void (O2::*method)(cppstem &, int))                 \
      : callback<cppstem> (object, method)

  #endif

  /* using a template here would require quite a bit more lines,
   * so a macro solution was chosen */
  #define EV_BEGIN_WATCHER(cppstem,cstem)                                               \
                                                                                        \
  struct cppstem : ev_ ## cstem, callback<cppstem>                                      \
  {                                                                                     \
    EV_CONSTRUCT (cppstem)                                                              \
    {                                                                                   \
      ev_init (static_cast<ev_ ## cstem *>(this), thunk);                               \
    }                                                                                   \
                                                                                        \
    bool is_active () const                                                             \
    {                                                                                   \
      return ev_is_active (static_cast<const ev_ ## cstem *>(this));                    \
    }                                                                                   \
                                                                                        \
    bool is_pending () const                                                            \
    {                                                                                   \
      return ev_is_pending (static_cast<const ev_ ## cstem *>(this));                   \
    }                                                                                   \
                                                                                        \
    void start ()                                                                       \
    {                                                                                   \
      ev_ ## cstem ## _start (EV_A_ static_cast<ev_ ## cstem *>(this));                 \
    }                                                                                   \
                                                                                        \
    void stop ()                                                                        \
    {                                                                                   \
      ev_ ## cstem ## _stop (EV_A_ static_cast<ev_ ## cstem *>(this));                  \
    }                                                                                   \
                                                                                        \
    void operator ()(int events = EV_UNDEF)                                             \
    {                                                                                   \
      return call (this, events);                                                       \
    }                                                                                   \
                                                                                        \
    ~cppstem ()                                                                         \
    {                                                                                   \
      stop ();                                                                          \
    }                                                                                   \
                                                                                        \
  private:                                                                              \
                                                                                        \
    cppstem (const cppstem &o)                                                          \
    : callback<cppstem> (this, (void (cppstem::*)(cppstem &, int))0)                    \
    { /* disabled */ }                                                                  \
                                                                                        \
    void operator =(const cppstem &o) { /* disabled */ }                                \
                                                                                        \
    static void thunk (EV_P_ struct ev_ ## cstem *w, int revents)                       \
    {                                                                                   \
      (*static_cast<cppstem *>(w))(revents);                                            \
    }                                                                                   \
                                                                                        \
  public:

  #define EV_END_WATCHER(cppstem,cstem)                                                 \
  };

  EV_BEGIN_WATCHER (io, io)
    void set (int fd, int events)
    {
      int active = is_active ();
      if (active) stop ();
      ev_io_set (static_cast<ev_io *>(this), fd, events);
      if (active) start ();
    }

    void set (int events)
    {
      int active = is_active ();
      if (active) stop ();
      ev_io_set (static_cast<ev_io *>(this), fd, events);
      if (active) start ();
    }

    void start (int fd, int events)
    {
      set (fd, events);
      start ();
    }
  EV_END_WATCHER (io, io)

  EV_BEGIN_WATCHER (timer, timer)
    void set (ev_tstamp after, ev_tstamp repeat = 0.)
    {
      int active = is_active ();
      if (active) stop ();
      ev_timer_set (static_cast<ev_timer *>(this), after, repeat);
      if (active) start ();
    }

    void start (ev_tstamp after, ev_tstamp repeat = 0.)
    {
      set (after, repeat);
      start ();
    }

    void again ()
    {
      ev_timer_again (EV_A_ static_cast<ev_timer *>(this));
    }
  EV_END_WATCHER (timer, timer)

  #if EV_PERIODIC_ENABLE
  EV_BEGIN_WATCHER (periodic, periodic)
    void set (ev_tstamp at, ev_tstamp interval = 0.)
    {
      int active = is_active ();
      if (active) stop ();
      ev_periodic_set (static_cast<ev_periodic *>(this), at, interval, 0);
      if (active) start ();
    }

    void start (ev_tstamp at, ev_tstamp interval = 0.)
    {
      set (at, interval);
      start ();
    }

    void again ()
    {
      ev_periodic_again (EV_A_ static_cast<ev_periodic *>(this));
    }
  EV_END_WATCHER (periodic, periodic)
  #endif

  EV_BEGIN_WATCHER (sig, signal)
    void set (int signum)
    {
      int active = is_active ();
      if (active) stop ();
      ev_signal_set (static_cast<ev_signal *>(this), signum);
      if (active) start ();
    }

    void start (int signum)
    {
      set (signum);
      start ();
    }
  EV_END_WATCHER (sig, signal)

  EV_BEGIN_WATCHER (child, child)
    void set (int pid)
    {
      int active = is_active ();
      if (active) stop ();
      ev_child_set (static_cast<ev_child *>(this), pid);
      if (active) start ();
    }

    void start (int pid)
    {
      set (pid);
      start ();
    }
  EV_END_WATCHER (child, child)

  #if EV_STAT_ENABLE
  EV_BEGIN_WATCHER (stat, stat)
    void set (const char *path, ev_tstamp interval = 0.)
    {
      int active = is_active ();
      if (active) stop ();
      ev_stat_set (static_cast<ev_stat *>(this), path, interval);
      if (active) start ();
    }

    void start (const char *path, ev_tstamp interval = 0.)
    {
      set (path, interval);
      start ();
    }

    void update ()
    {
      ev_stat_stat (EV_A_ static_cast<ev_stat *>(this));
    }
  EV_END_WATCHER (stat, stat)
  #endif

  EV_BEGIN_WATCHER (idle, idle)
    void set () { }
  EV_END_WATCHER (idle, idle)

  EV_BEGIN_WATCHER (prepare, prepare)
    void set () { }
  EV_END_WATCHER (prepare, prepare)

  EV_BEGIN_WATCHER (check, check)
    void set () { }
  EV_END_WATCHER (check, check)

  #if EV_EMBED_ENABLE
  EV_BEGIN_WATCHER (embed, embed)
    void set (struct ev_loop *loop)
    {
      int active = is_active ();
      if (active) stop ();
      ev_embed_set (static_cast<ev_embed *>(this), loop);
      if (active) start ();
    }

    void start (struct ev_loop *embedded_loop)
    {
      set (embedded_loop);
      start ();
    }

    void sweep ()
    {
      ev_embed_sweep (EV_A_ static_cast<ev_embed *>(this));
    }
  EV_END_WATCHER (embed, embed)
  #endif

  #undef EV_CONSTRUCT
  #undef EV_BEGIN_WATCHER
  #undef EV_END_WATCHER
}

#endif

Revision:	1.9
Committed:	Tue Nov 27 10:59:10 2007 UTC (16 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.8:	+4 -1 lines
Log Message:	docs
#	Content
1	#ifndef EVPP_H__
2	#define EVPP_H__
3
4	#include "ev.h"
5
6	namespace ev {
7
8	template<class watcher>
9	class callback
10	{
11	struct object { };
12
13	void *obj;
14	void (object::*meth)(watcher &, int);
15
16	/* a proxy is a kind of recipe on how to call a specific class method */
17	struct proxy_base {
18	virtual void call (void obj, void (object::meth)(watcher &, int), watcher &w, int) const = 0;
19	};
20	template<class O1, class O2>
21	struct proxy : proxy_base {
22	virtual void call (void obj, void (object::meth)(watcher &, int), watcher &w, int e) const
23	{
24	((reinterpret_cast<O1 >(obj)) -> (reinterpret_cast<void (O2::*)(watcher &, int)>(meth)))
25	(w, e);
26	}
27	};
28
29	proxy_base *prxy;
30
31	public:
32	template<class O1, class O2>
33	explicit callback (O1 object, void (O2::method)(watcher &, int))
34	{
35	static proxy<O1,O2> p;
36	obj = reinterpret_cast<void *>(object);
37	meth = reinterpret_cast<void (object::*)(watcher &, int)>(method);
38	prxy = &p;
39	}
40
41	void call (watcher *w, int e) const
42	{
43	return prxy->call (obj, meth, *w, e);
44	}
45	};
46
47	enum {
48	UNDEF = EV_UNDEF,
49	NONE = EV_NONE,
50	READ = EV_READ,
51	WRITE = EV_WRITE,
52	TIMEOUT = EV_TIMEOUT,
53	PERIODIC = EV_PERIODIC,
54	SIGNAL = EV_SIGNAL,
55	CHILD = EV_CHILD,
56	STAT = EV_STAT,
57	IDLE = EV_IDLE,
58	CHECK = EV_CHECK,
59	PREPARE = EV_PREPARE,
60	FORK = EV_FORK,
61	EMBED = EV_EMBED,
62	ERROR = EV_ERROR,
63	};
64
65	typedef ev_tstamp tstamp;
66
67	inline ev_tstamp now (EV_P)
68	{
69	return ev_now (EV_A);
70	}
71
72	#if EV_MULTIPLICITY
73
74	#define EV_CONSTRUCT(cppstem) \
75	EV_P; \
76	\
77	void set (EV_P) \
78	{ \
79	this->EV_A = EV_A; \
80	} \
81	\
82	template<class O1, class O2> \
83	explicit cppstem (O1 object, void (O2::method)(cppstem &, int), EV_P = ev_default_loop (0)) \
84	: callback<cppstem> (object, method), EV_A (EV_A)
85
86	#else
87
88	#define EV_CONSTRUCT(cppstem) \
89	template<class O1, class O2> \
90	explicit cppstem (O1 object, void (O2::method)(cppstem &, int)) \
91	: callback<cppstem> (object, method)
92
93	#endif
94
95	/* using a template here would require quite a bit more lines,
96	* so a macro solution was chosen */
97	#define EV_BEGIN_WATCHER(cppstem,cstem) \
98	\
99	struct cppstem : ev_ ## cstem, callback<cppstem> \
100	{ \
101	EV_CONSTRUCT (cppstem) \
102	{ \
103	ev_init (static_cast<ev_ ## cstem *>(this), thunk); \
104	} \
105	\
106	bool is_active () const \
107	{ \
108	return ev_is_active (static_cast<const ev_ ## cstem *>(this)); \
109	} \
110	\
111	bool is_pending () const \
112	{ \
113	return ev_is_pending (static_cast<const ev_ ## cstem *>(this)); \
114	} \
115	\
116	void start () \
117	{ \
118	ev_ ## cstem ## _start (EV_A_ static_cast<ev_ ## cstem *>(this)); \
119	} \
120	\
121	void stop () \
122	{ \
123	ev_ ## cstem ## _stop (EV_A_ static_cast<ev_ ## cstem *>(this)); \
124	} \
125	\
126	void operator ()(int events = EV_UNDEF) \
127	{ \
128	return call (this, events); \
129	} \
130	\
131	~cppstem () \
132	{ \
133	stop (); \
134	} \
135	\
136	private: \
137	\
138	cppstem (const cppstem &o) \
139	: callback<cppstem> (this, (void (cppstem::*)(cppstem &, int))0) \
140	{ /* disabled */ } \
141	\
142	void operator =(const cppstem &o) { /* disabled */ } \
143	\
144	static void thunk (EV_P_ struct ev_ ## cstem *w, int revents) \
145	{ \
146	(static_cast<cppstem >(w))(revents); \
147	} \
148	\
149	public:
150
151	#define EV_END_WATCHER(cppstem,cstem) \
152	};
153
154	EV_BEGIN_WATCHER (io, io)
155	void set (int fd, int events)
156	{
157	int active = is_active ();
158	if (active) stop ();
159	ev_io_set (static_cast<ev_io *>(this), fd, events);
160	if (active) start ();
161	}
162
163	void set (int events)
164	{
165	int active = is_active ();
166	if (active) stop ();
167	ev_io_set (static_cast<ev_io *>(this), fd, events);
168	if (active) start ();
169	}
170
171	void start (int fd, int events)
172	{
173	set (fd, events);
174	start ();
175	}
176	EV_END_WATCHER (io, io)
177
178	EV_BEGIN_WATCHER (timer, timer)
179	void set (ev_tstamp after, ev_tstamp repeat = 0.)
180	{
181	int active = is_active ();
182	if (active) stop ();
183	ev_timer_set (static_cast<ev_timer *>(this), after, repeat);
184	if (active) start ();
185	}
186
187	void start (ev_tstamp after, ev_tstamp repeat = 0.)
188	{
189	set (after, repeat);
190	start ();
191	}
192
193	void again ()
194	{
195	ev_timer_again (EV_A_ static_cast<ev_timer *>(this));
196	}
197	EV_END_WATCHER (timer, timer)
198
199	#if EV_PERIODIC_ENABLE
200	EV_BEGIN_WATCHER (periodic, periodic)
201	void set (ev_tstamp at, ev_tstamp interval = 0.)
202	{
203	int active = is_active ();
204	if (active) stop ();
205	ev_periodic_set (static_cast<ev_periodic *>(this), at, interval, 0);
206	if (active) start ();
207	}
208
209	void start (ev_tstamp at, ev_tstamp interval = 0.)
210	{
211	set (at, interval);
212	start ();
213	}
214
215	void again ()
216	{
217	ev_periodic_again (EV_A_ static_cast<ev_periodic *>(this));
218	}
219	EV_END_WATCHER (periodic, periodic)
220	#endif
221
222	EV_BEGIN_WATCHER (sig, signal)
223	void set (int signum)
224	{
225	int active = is_active ();
226	if (active) stop ();
227	ev_signal_set (static_cast<ev_signal *>(this), signum);
228	if (active) start ();
229	}
230
231	void start (int signum)
232	{
233	set (signum);
234	start ();
235	}
236	EV_END_WATCHER (sig, signal)
237
238	EV_BEGIN_WATCHER (child, child)
239	void set (int pid)
240	{
241	int active = is_active ();
242	if (active) stop ();
243	ev_child_set (static_cast<ev_child *>(this), pid);
244	if (active) start ();
245	}
246
247	void start (int pid)
248	{
249	set (pid);
250	start ();
251	}
252	EV_END_WATCHER (child, child)
253
254	#if EV_STAT_ENABLE
255	EV_BEGIN_WATCHER (stat, stat)
256	void set (const char *path, ev_tstamp interval = 0.)
257	{
258	int active = is_active ();
259	if (active) stop ();
260	ev_stat_set (static_cast<ev_stat *>(this), path, interval);
261	if (active) start ();
262	}
263
264	void start (const char *path, ev_tstamp interval = 0.)
265	{
266	set (path, interval);
267	start ();
268	}
269
270	void update ()
271	{
272	ev_stat_stat (EV_A_ static_cast<ev_stat *>(this));
273	}
274	EV_END_WATCHER (stat, stat)
275	#endif
276
277	EV_BEGIN_WATCHER (idle, idle)
278	void set () { }
279	EV_END_WATCHER (idle, idle)
280
281	EV_BEGIN_WATCHER (prepare, prepare)
282	void set () { }
283	EV_END_WATCHER (prepare, prepare)
284
285	EV_BEGIN_WATCHER (check, check)
286	void set () { }
287	EV_END_WATCHER (check, check)
288
289	#if EV_EMBED_ENABLE
290	EV_BEGIN_WATCHER (embed, embed)
291	void set (struct ev_loop *loop)
292	{
293	int active = is_active ();
294	if (active) stop ();
295	ev_embed_set (static_cast<ev_embed *>(this), loop);
296	if (active) start ();
297	}
298
299	void start (struct ev_loop *embedded_loop)
300	{
301	set (embedded_loop);
302	start ();
303	}
304
305	void sweep ()
306	{
307	ev_embed_sweep (EV_A_ static_cast<ev_embed *>(this));
308	}
309	EV_END_WATCHER (embed, embed)
310	#endif
311
312	#undef EV_CONSTRUCT
313	#undef EV_BEGIN_WATCHER
314	#undef EV_END_WATCHER
315	}
316
317	#endif
318