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
#	User	Rev	Content
1	root	1.1	#ifndef EVPP_H__
2			#define EVPP_H__
3
4	root	1.7	#include "ev.h"
5	root	1.1
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	root	1.2	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	root	1.9	CHILD = EV_CHILD,
56			STAT = EV_STAT,
57	root	1.2	IDLE = EV_IDLE,
58			CHECK = EV_CHECK,
59			PREPARE = EV_PREPARE,
60	root	1.9	FORK = EV_FORK,
61			EMBED = EV_EMBED,
62	root	1.2	ERROR = EV_ERROR,
63			};
64
65	root	1.1	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	root	1.4	#define EV_BEGIN_WATCHER(cppstem,cstem) \
98	root	1.1	\
99			struct cppstem : ev_ ## cstem, callback<cppstem> \
100			{ \
101			EV_CONSTRUCT (cppstem) \
102			{ \
103	root	1.6	ev_init (static_cast<ev_ ## cstem *>(this), thunk); \
104	root	1.1	} \
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	root	1.3	~cppstem () \
132			{ \
133			stop (); \
134			} \
135			\
136	root	1.1	private: \
137			\
138			cppstem (const cppstem &o) \
139			: callback<cppstem> (this, (void (cppstem::*)(cppstem &, int))0) \
140			{ /* disabled */ } \
141	root	1.6	\
142	root	1.1	void operator =(const cppstem &o) { /* disabled */ } \
143			\
144	root	1.6	static void thunk (EV_P_ struct ev_ ## cstem *w, int revents) \
145			{ \
146			(static_cast<cppstem >(w))(revents); \
147			} \
148			\
149	root	1.1	public:
150
151	root	1.4	#define EV_END_WATCHER(cppstem,cstem) \
152	root	1.6	};
153	root	1.4
154			EV_BEGIN_WATCHER (io, io)
155	root	1.1	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	root	1.4	EV_END_WATCHER (io, io)
177	root	1.1
178	root	1.4	EV_BEGIN_WATCHER (timer, timer)
179	root	1.1	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	root	1.4	EV_END_WATCHER (timer, timer)
198	root	1.1
199	root	1.8	#if EV_PERIODIC_ENABLE
200	root	1.4	EV_BEGIN_WATCHER (periodic, periodic)
201	root	1.1	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	root	1.4	EV_END_WATCHER (periodic, periodic)
220	root	1.3	#endif
221	root	1.1
222	root	1.4	EV_BEGIN_WATCHER (sig, signal)
223	root	1.1	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	root	1.4	EV_END_WATCHER (sig, signal)
237	root	1.1
238	root	1.4	EV_BEGIN_WATCHER (child, child)
239	root	1.1	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	root	1.4	EV_END_WATCHER (child, child)
253	root	1.1
254	root	1.8	#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	root	1.7
281	root	1.8	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	root	1.7	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	root	1.1	#undef EV_CONSTRUCT
313	root	1.4	#undef EV_BEGIN_WATCHER
314	root	1.7	#undef EV_END_WATCHER
315	root	1.1	}
316
317			#endif
318