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,
    IDLE     = EV_IDLE,
    CHECK    = EV_CHECK,
    PREPARE  = EV_PREPARE,
    CHILD    = EV_CHILD,
    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_PERIODICS
  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 (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)

  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_MULTIPLICITY

  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:	1.7
Committed:	Sat Nov 24 09:48:37 2007 UTC (16 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-1_3
Changes since 1.6:	+30 -3 lines
Log Message:	document c++ api
#	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	IDLE = EV_IDLE,
56	CHECK = EV_CHECK,
57	PREPARE = EV_PREPARE,
58	CHILD = EV_CHILD,
59	ERROR = EV_ERROR,
60	};
61
62	typedef ev_tstamp tstamp;
63
64	inline ev_tstamp now (EV_P)
65	{
66	return ev_now (EV_A);
67	}
68
69	#if EV_MULTIPLICITY
70
71	#define EV_CONSTRUCT(cppstem) \
72	EV_P; \
73	\
74	void set (EV_P) \
75	{ \
76	this->EV_A = EV_A; \
77	} \
78	\
79	template<class O1, class O2> \
80	explicit cppstem (O1 object, void (O2::method)(cppstem &, int), EV_P = ev_default_loop (0)) \
81	: callback<cppstem> (object, method), EV_A (EV_A)
82
83	#else
84
85	#define EV_CONSTRUCT(cppstem) \
86	template<class O1, class O2> \
87	explicit cppstem (O1 object, void (O2::method)(cppstem &, int)) \
88	: callback<cppstem> (object, method)
89
90	#endif
91
92	/* using a template here would require quite a bit more lines,
93	* so a macro solution was chosen */
94	#define EV_BEGIN_WATCHER(cppstem,cstem) \
95	\
96	struct cppstem : ev_ ## cstem, callback<cppstem> \
97	{ \
98	EV_CONSTRUCT (cppstem) \
99	{ \
100	ev_init (static_cast<ev_ ## cstem *>(this), thunk); \
101	} \
102	\
103	bool is_active () const \
104	{ \
105	return ev_is_active (static_cast<const ev_ ## cstem *>(this)); \
106	} \
107	\
108	bool is_pending () const \
109	{ \
110	return ev_is_pending (static_cast<const ev_ ## cstem *>(this)); \
111	} \
112	\
113	void start () \
114	{ \
115	ev_ ## cstem ## _start (EV_A_ static_cast<ev_ ## cstem *>(this)); \
116	} \
117	\
118	void stop () \
119	{ \
120	ev_ ## cstem ## _stop (EV_A_ static_cast<ev_ ## cstem *>(this)); \
121	} \
122	\
123	void operator ()(int events = EV_UNDEF) \
124	{ \
125	return call (this, events); \
126	} \
127	\
128	~cppstem () \
129	{ \
130	stop (); \
131	} \
132	\
133	private: \
134	\
135	cppstem (const cppstem &o) \
136	: callback<cppstem> (this, (void (cppstem::*)(cppstem &, int))0) \
137	{ /* disabled */ } \
138	\
139	void operator =(const cppstem &o) { /* disabled */ } \
140	\
141	static void thunk (EV_P_ struct ev_ ## cstem *w, int revents) \
142	{ \
143	(static_cast<cppstem >(w))(revents); \
144	} \
145	\
146	public:
147
148	#define EV_END_WATCHER(cppstem,cstem) \
149	};
150
151	EV_BEGIN_WATCHER (io, io)
152	void set (int fd, int events)
153	{
154	int active = is_active ();
155	if (active) stop ();
156	ev_io_set (static_cast<ev_io *>(this), fd, events);
157	if (active) start ();
158	}
159
160	void set (int events)
161	{
162	int active = is_active ();
163	if (active) stop ();
164	ev_io_set (static_cast<ev_io *>(this), fd, events);
165	if (active) start ();
166	}
167
168	void start (int fd, int events)
169	{
170	set (fd, events);
171	start ();
172	}
173	EV_END_WATCHER (io, io)
174
175	EV_BEGIN_WATCHER (timer, timer)
176	void set (ev_tstamp after, ev_tstamp repeat = 0.)
177	{
178	int active = is_active ();
179	if (active) stop ();
180	ev_timer_set (static_cast<ev_timer *>(this), after, repeat);
181	if (active) start ();
182	}
183
184	void start (ev_tstamp after, ev_tstamp repeat = 0.)
185	{
186	set (after, repeat);
187	start ();
188	}
189
190	void again ()
191	{
192	ev_timer_again (EV_A_ static_cast<ev_timer *>(this));
193	}
194	EV_END_WATCHER (timer, timer)
195
196	#if EV_PERIODICS
197	EV_BEGIN_WATCHER (periodic, periodic)
198	void set (ev_tstamp at, ev_tstamp interval = 0.)
199	{
200	int active = is_active ();
201	if (active) stop ();
202	ev_periodic_set (static_cast<ev_periodic *>(this), at, interval, 0);
203	if (active) start ();
204	}
205
206	void start (ev_tstamp at, ev_tstamp interval = 0.)
207	{
208	set (at, interval);
209	start ();
210	}
211
212	void again ()
213	{
214	ev_periodic_again (EV_A_ static_cast<ev_periodic *>(this));
215	}
216	EV_END_WATCHER (periodic, periodic)
217	#endif
218
219	EV_BEGIN_WATCHER (idle, idle)
220	void set () { }
221	EV_END_WATCHER (idle, idle)
222
223	EV_BEGIN_WATCHER (prepare, prepare)
224	void set () { }
225	EV_END_WATCHER (prepare, prepare)
226
227	EV_BEGIN_WATCHER (check, check)
228	void set () { }
229	EV_END_WATCHER (check, check)
230
231	EV_BEGIN_WATCHER (sig, signal)
232	void set (int signum)
233	{
234	int active = is_active ();
235	if (active) stop ();
236	ev_signal_set (static_cast<ev_signal *>(this), signum);
237	if (active) start ();
238	}
239
240	void start (int signum)
241	{
242	set (signum);
243	start ();
244	}
245	EV_END_WATCHER (sig, signal)
246
247	EV_BEGIN_WATCHER (child, child)
248	void set (int pid)
249	{
250	int active = is_active ();
251	if (active) stop ();
252	ev_child_set (static_cast<ev_child *>(this), pid);
253	if (active) start ();
254	}
255
256	void start (int pid)
257	{
258	set (pid);
259	start ();
260	}
261	EV_END_WATCHER (child, child)
262
263	#if EV_MULTIPLICITY
264
265	EV_BEGIN_WATCHER (embed, embed)
266	void set (struct ev_loop *loop)
267	{
268	int active = is_active ();
269	if (active) stop ();
270	ev_embed_set (static_cast<ev_embed *>(this), loop);
271	if (active) start ();
272	}
273
274	void start (struct ev_loop *embedded_loop)
275	{
276	set (embedded_loop);
277	start ();
278	}
279
280	void sweep ()
281	{
282	ev_embed_sweep (EV_A_ static_cast<ev_embed *>(this));
283	}
284	EV_END_WATCHER (embed, embed)
285
286	#endif
287
288	#undef EV_CONSTRUCT
289	#undef EV_BEGIN_WATCHER
290	#undef EV_END_WATCHER
291	}
292
293	#endif
294