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"

  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)
  EV_END_WATCHER (idle, idle)

  EV_BEGIN_WATCHER (prepare, prepare)
  EV_END_WATCHER (prepare, prepare)

  EV_BEGIN_WATCHER (check, check)
  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)

  #undef EV_CONSTRUCT
  #undef EV_BEGIN_WATCHER
}

#endif

Revision:	1.6
Committed:	Wed Nov 14 06:08:13 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-0_9, rel-1_1, rel-1_2
Changes since 1.5:	+8 -9 lines
Log Message:	use a static method as thunk, saving codesize and better hiding. didn't know this was possible
#	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	root	1.2	enum {
50			UNDEF = EV_UNDEF,
51			NONE = EV_NONE,
52			READ = EV_READ,
53			WRITE = EV_WRITE,
54			TIMEOUT = EV_TIMEOUT,
55			PERIODIC = EV_PERIODIC,
56			SIGNAL = EV_SIGNAL,
57			IDLE = EV_IDLE,
58			CHECK = EV_CHECK,
59			PREPARE = EV_PREPARE,
60			CHILD = EV_CHILD,
61			ERROR = EV_ERROR,
62			};
63
64	root	1.1	typedef ev_tstamp tstamp;
65
66			inline ev_tstamp now (EV_P)
67			{
68			return ev_now (EV_A);
69			}
70
71			#if EV_MULTIPLICITY
72
73			#define EV_CONSTRUCT(cppstem) \
74			EV_P; \
75			\
76			void set (EV_P) \
77			{ \
78			this->EV_A = EV_A; \
79			} \
80			\
81			template<class O1, class O2> \
82			explicit cppstem (O1 object, void (O2::method)(cppstem &, int), EV_P = ev_default_loop (0)) \
83			: callback<cppstem> (object, method), EV_A (EV_A)
84
85			#else
86
87			#define EV_CONSTRUCT(cppstem) \
88			template<class O1, class O2> \
89			explicit cppstem (O1 object, void (O2::method)(cppstem &, int)) \
90			: callback<cppstem> (object, method)
91
92			#endif
93
94			/* using a template here would require quite a bit more lines,
95			* so a macro solution was chosen */
96	root	1.4	#define EV_BEGIN_WATCHER(cppstem,cstem) \
97	root	1.1	\
98			struct cppstem : ev_ ## cstem, callback<cppstem> \
99			{ \
100			EV_CONSTRUCT (cppstem) \
101			{ \
102	root	1.6	ev_init (static_cast<ev_ ## cstem *>(this), thunk); \
103	root	1.1	} \
104			\
105			bool is_active () const \
106			{ \
107			return ev_is_active (static_cast<const ev_ ## cstem *>(this)); \
108			} \
109			\
110			bool is_pending () const \
111			{ \
112			return ev_is_pending (static_cast<const ev_ ## cstem *>(this)); \
113			} \
114			\
115			void start () \
116			{ \
117			ev_ ## cstem ## _start (EV_A_ static_cast<ev_ ## cstem *>(this)); \
118			} \
119			\
120			void stop () \
121			{ \
122			ev_ ## cstem ## _stop (EV_A_ static_cast<ev_ ## cstem *>(this)); \
123			} \
124			\
125			void operator ()(int events = EV_UNDEF) \
126			{ \
127			return call (this, events); \
128			} \
129			\
130	root	1.3	~cppstem () \
131			{ \
132			stop (); \
133			} \
134			\
135	root	1.1	private: \
136			\
137			cppstem (const cppstem &o) \
138			: callback<cppstem> (this, (void (cppstem::*)(cppstem &, int))0) \
139			{ /* disabled */ } \
140	root	1.6	\
141	root	1.1	void operator =(const cppstem &o) { /* disabled */ } \
142			\
143	root	1.6	static void thunk (EV_P_ struct ev_ ## cstem *w, int revents) \
144			{ \
145			(static_cast<cppstem >(w))(revents); \
146			} \
147			\
148	root	1.1	public:
149
150	root	1.4	#define EV_END_WATCHER(cppstem,cstem) \
151	root	1.6	};
152	root	1.4
153			EV_BEGIN_WATCHER (io, io)
154	root	1.1	void set (int fd, int events)
155			{
156			int active = is_active ();
157			if (active) stop ();
158			ev_io_set (static_cast<ev_io *>(this), fd, events);
159			if (active) start ();
160			}
161
162			void set (int events)
163			{
164			int active = is_active ();
165			if (active) stop ();
166			ev_io_set (static_cast<ev_io *>(this), fd, events);
167			if (active) start ();
168			}
169
170			void start (int fd, int events)
171			{
172			set (fd, events);
173			start ();
174			}
175	root	1.4	EV_END_WATCHER (io, io)
176	root	1.1
177	root	1.4	EV_BEGIN_WATCHER (timer, timer)
178	root	1.1	void set (ev_tstamp after, ev_tstamp repeat = 0.)
179			{
180			int active = is_active ();
181			if (active) stop ();
182			ev_timer_set (static_cast<ev_timer *>(this), after, repeat);
183			if (active) start ();
184			}
185
186			void start (ev_tstamp after, ev_tstamp repeat = 0.)
187			{
188			set (after, repeat);
189			start ();
190			}
191
192			void again ()
193			{
194			ev_timer_again (EV_A_ static_cast<ev_timer *>(this));
195			}
196	root	1.4	EV_END_WATCHER (timer, timer)
197	root	1.1
198	root	1.3	#if EV_PERIODICS
199	root	1.4	EV_BEGIN_WATCHER (periodic, periodic)
200	root	1.1	void set (ev_tstamp at, ev_tstamp interval = 0.)
201			{
202			int active = is_active ();
203			if (active) stop ();
204			ev_periodic_set (static_cast<ev_periodic *>(this), at, interval, 0);
205			if (active) start ();
206			}
207
208			void start (ev_tstamp at, ev_tstamp interval = 0.)
209			{
210			set (at, interval);
211			start ();
212			}
213
214			void again ()
215			{
216			ev_periodic_again (EV_A_ static_cast<ev_periodic *>(this));
217			}
218	root	1.4	EV_END_WATCHER (periodic, periodic)
219	root	1.3	#endif
220	root	1.1
221	root	1.4	EV_BEGIN_WATCHER (idle, idle)
222			EV_END_WATCHER (idle, idle)
223	root	1.1
224	root	1.4	EV_BEGIN_WATCHER (prepare, prepare)
225			EV_END_WATCHER (prepare, prepare)
226	root	1.1
227	root	1.4	EV_BEGIN_WATCHER (check, check)
228			EV_END_WATCHER (check, check)
229	root	1.1
230	root	1.4	EV_BEGIN_WATCHER (sig, signal)
231	root	1.1	void set (int signum)
232			{
233			int active = is_active ();
234			if (active) stop ();
235			ev_signal_set (static_cast<ev_signal *>(this), signum);
236			if (active) start ();
237			}
238
239			void start (int signum)
240			{
241			set (signum);
242			start ();
243			}
244	root	1.4	EV_END_WATCHER (sig, signal)
245	root	1.1
246	root	1.4	EV_BEGIN_WATCHER (child, child)
247	root	1.1	void set (int pid)
248			{
249			int active = is_active ();
250			if (active) stop ();
251			ev_child_set (static_cast<ev_child *>(this), pid);
252			if (active) start ();
253			}
254
255			void start (int pid)
256			{
257			set (pid);
258			start ();
259			}
260	root	1.4	EV_END_WATCHER (child, child)
261	root	1.1
262			#undef EV_CONSTRUCT
263	root	1.4	#undef EV_BEGIN_WATCHER
264	root	1.1	}
265
266			#endif
267