libev/ev%2B%2B.h

#ifndef EVPP_H__
#define EVPP_H__

/* work in progress, don't use unless you know what you are doing */

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);
    }
  };

  #include "ev.h"

  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_DECLARE_WATCHER(cppstem,cstem)                                             \
                                                                                        \
  extern "C" void cb_ ## cppstem (struct ev_ ## cstem *w, int revents);                 \
                                                                                        \
  struct cppstem : ev_ ## cstem, callback<cppstem>                                      \
  {                                                                                     \
    EV_CONSTRUCT (cppstem)                                                              \
    {                                                                                   \
      ev_init (static_cast<ev_ ## cstem *>(this), cb_ ## cppstem);                      \
    }                                                                                   \
                                                                                        \
    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);                                                       \
    }                                                                                   \
                                                                                        \
  private:                                                                              \
                                                                                        \
    cppstem (const cppstem &o)                                                          \
    : callback<cppstem> (this, (void (cppstem::*)(cppstem &, int))0)                    \
    { /* disabled */ }                                                                  \
    void operator =(const cppstem &o) { /* disabled */ }                                \
                                                                                        \
  public:

  EV_DECLARE_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_DECLARE_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_DECLARE_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_DECLARE_WATCHER (idle, idle)
  };

  EV_DECLARE_WATCHER (prepare, prepare)
  };

  EV_DECLARE_WATCHER (check, check)
  };

  EV_DECLARE_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_DECLARE_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 ();
    }
  };

  #undef EV_CONSTRUCT
  #undef EV_DECLARE_WATCHER
}

#endif

Revision:	1.1
Committed:	Sat Nov 10 21:19:30 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Log Message:	first rough cut at c++ interface
#	User	Rev	Content
1	root	1.1	#ifndef EVPP_H__
2			#define EVPP_H__
3
4			/* work in progress, don't use unless you know what you are doing */
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			#include "ev.h"
48
49			typedef ev_tstamp tstamp;
50
51			inline ev_tstamp now (EV_P)
52			{
53			return ev_now (EV_A);
54			}
55
56			#if EV_MULTIPLICITY
57
58			#define EV_CONSTRUCT(cppstem) \
59			EV_P; \
60			\
61			void set (EV_P) \
62			{ \
63			this->EV_A = EV_A; \
64			} \
65			\
66			template<class O1, class O2> \
67			explicit cppstem (O1 object, void (O2::method)(cppstem &, int), EV_P = ev_default_loop (0)) \
68			: callback<cppstem> (object, method), EV_A (EV_A)
69
70			#else
71
72			#define EV_CONSTRUCT(cppstem) \
73			template<class O1, class O2> \
74			explicit cppstem (O1 object, void (O2::method)(cppstem &, int)) \
75			: callback<cppstem> (object, method)
76
77			#endif
78
79			/* using a template here would require quite a bit more lines,
80			* so a macro solution was chosen */
81			#define EV_DECLARE_WATCHER(cppstem,cstem) \
82			\
83			extern "C" void cb_ ## cppstem (struct ev_ ## cstem *w, int revents); \
84			\
85			struct cppstem : ev_ ## cstem, callback<cppstem> \
86			{ \
87			EV_CONSTRUCT (cppstem) \
88			{ \
89			ev_init (static_cast<ev_ ## cstem *>(this), cb_ ## cppstem); \
90			} \
91			\
92			bool is_active () const \
93			{ \
94			return ev_is_active (static_cast<const ev_ ## cstem *>(this)); \
95			} \
96			\
97			bool is_pending () const \
98			{ \
99			return ev_is_pending (static_cast<const ev_ ## cstem *>(this)); \
100			} \
101			\
102			void start () \
103			{ \
104			ev_ ## cstem ## _start (EV_A_ static_cast<ev_ ## cstem *>(this)); \
105			} \
106			\
107			void stop () \
108			{ \
109			ev_ ## cstem ## _stop (EV_A_ static_cast<ev_ ## cstem *>(this)); \
110			} \
111			\
112			void operator ()(int events = EV_UNDEF) \
113			{ \
114			return call (this, events); \
115			} \
116			\
117			private: \
118			\
119			cppstem (const cppstem &o) \
120			: callback<cppstem> (this, (void (cppstem::*)(cppstem &, int))0) \
121			{ /* disabled */ } \
122			void operator =(const cppstem &o) { /* disabled */ } \
123			\
124			public:
125
126			EV_DECLARE_WATCHER (io, io)
127			void set (int fd, int events)
128			{
129			int active = is_active ();
130			if (active) stop ();
131			ev_io_set (static_cast<ev_io *>(this), fd, events);
132			if (active) start ();
133			}
134
135			void set (int events)
136			{
137			int active = is_active ();
138			if (active) stop ();
139			ev_io_set (static_cast<ev_io *>(this), fd, events);
140			if (active) start ();
141			}
142
143			void start (int fd, int events)
144			{
145			set (fd, events);
146			start ();
147			}
148			};
149
150			EV_DECLARE_WATCHER (timer, timer)
151			void set (ev_tstamp after, ev_tstamp repeat = 0.)
152			{
153			int active = is_active ();
154			if (active) stop ();
155			ev_timer_set (static_cast<ev_timer *>(this), after, repeat);
156			if (active) start ();
157			}
158
159			void start (ev_tstamp after, ev_tstamp repeat = 0.)
160			{
161			set (after, repeat);
162			start ();
163			}
164
165			void again ()
166			{
167			ev_timer_again (EV_A_ static_cast<ev_timer *>(this));
168			}
169			};
170
171			EV_DECLARE_WATCHER (periodic, periodic)
172			void set (ev_tstamp at, ev_tstamp interval = 0.)
173			{
174			int active = is_active ();
175			if (active) stop ();
176			ev_periodic_set (static_cast<ev_periodic *>(this), at, interval, 0);
177			if (active) start ();
178			}
179
180			void start (ev_tstamp at, ev_tstamp interval = 0.)
181			{
182			set (at, interval);
183			start ();
184			}
185
186			void again ()
187			{
188			ev_periodic_again (EV_A_ static_cast<ev_periodic *>(this));
189			}
190			};
191
192			EV_DECLARE_WATCHER (idle, idle)
193			};
194
195			EV_DECLARE_WATCHER (prepare, prepare)
196			};
197
198			EV_DECLARE_WATCHER (check, check)
199			};
200
201			EV_DECLARE_WATCHER (sig, signal)
202			void set (int signum)
203			{
204			int active = is_active ();
205			if (active) stop ();
206			ev_signal_set (static_cast<ev_signal *>(this), signum);
207			if (active) start ();
208			}
209
210			void start (int signum)
211			{
212			set (signum);
213			start ();
214			}
215			};
216
217			EV_DECLARE_WATCHER (child, child)
218			void set (int pid)
219			{
220			int active = is_active ();
221			if (active) stop ();
222			ev_child_set (static_cast<ev_child *>(this), pid);
223			if (active) start ();
224			}
225
226			void start (int pid)
227			{
228			set (pid);
229			start ();
230			}
231			};
232
233			#undef EV_CONSTRUCT
234			#undef EV_DECLARE_WATCHER
235			}
236
237			#endif
238