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
#	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			IDLE = EV_IDLE,
56			CHECK = EV_CHECK,
57			PREPARE = EV_PREPARE,
58			CHILD = EV_CHILD,
59			ERROR = EV_ERROR,
60			};
61
62	root	1.1	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	root	1.4	#define EV_BEGIN_WATCHER(cppstem,cstem) \
95	root	1.1	\
96			struct cppstem : ev_ ## cstem, callback<cppstem> \
97			{ \
98			EV_CONSTRUCT (cppstem) \
99			{ \
100	root	1.6	ev_init (static_cast<ev_ ## cstem *>(this), thunk); \
101	root	1.1	} \
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	root	1.3	~cppstem () \
129			{ \
130			stop (); \
131			} \
132			\
133	root	1.1	private: \
134			\
135			cppstem (const cppstem &o) \
136			: callback<cppstem> (this, (void (cppstem::*)(cppstem &, int))0) \
137			{ /* disabled */ } \
138	root	1.6	\
139	root	1.1	void operator =(const cppstem &o) { /* disabled */ } \
140			\
141	root	1.6	static void thunk (EV_P_ struct ev_ ## cstem *w, int revents) \
142			{ \
143			(static_cast<cppstem >(w))(revents); \
144			} \
145			\
146	root	1.1	public:
147
148	root	1.4	#define EV_END_WATCHER(cppstem,cstem) \
149	root	1.6	};
150	root	1.4
151			EV_BEGIN_WATCHER (io, io)
152	root	1.1	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	root	1.4	EV_END_WATCHER (io, io)
174	root	1.1
175	root	1.4	EV_BEGIN_WATCHER (timer, timer)
176	root	1.1	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	root	1.4	EV_END_WATCHER (timer, timer)
195	root	1.1
196	root	1.3	#if EV_PERIODICS
197	root	1.4	EV_BEGIN_WATCHER (periodic, periodic)
198	root	1.1	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	root	1.4	EV_END_WATCHER (periodic, periodic)
217	root	1.3	#endif
218	root	1.1
219	root	1.4	EV_BEGIN_WATCHER (idle, idle)
220	root	1.7	void set () { }
221	root	1.4	EV_END_WATCHER (idle, idle)
222	root	1.1
223	root	1.4	EV_BEGIN_WATCHER (prepare, prepare)
224	root	1.7	void set () { }
225	root	1.4	EV_END_WATCHER (prepare, prepare)
226	root	1.1
227	root	1.4	EV_BEGIN_WATCHER (check, check)
228	root	1.7	void set () { }
229	root	1.4	EV_END_WATCHER (check, check)
230	root	1.1
231	root	1.4	EV_BEGIN_WATCHER (sig, signal)
232	root	1.1	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	root	1.4	EV_END_WATCHER (sig, signal)
246	root	1.1
247	root	1.4	EV_BEGIN_WATCHER (child, child)
248	root	1.1	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	root	1.4	EV_END_WATCHER (child, child)
262	root	1.1
263	root	1.7	#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	root	1.1	#undef EV_CONSTRUCT
289	root	1.4	#undef EV_BEGIN_WATCHER
290	root	1.7	#undef EV_END_WATCHER
291	root	1.1	}
292
293			#endif
294