| … | |
… | |
| 6 | namespace ev { |
6 | namespace ev { |
| 7 | |
7 | |
| 8 | template<class watcher> |
8 | template<class watcher> |
| 9 | class callback |
9 | class callback |
| 10 | { |
10 | { |
| 11 | struct object { }; |
11 | struct klass; // it is vital that this is never defined |
| 12 | |
12 | |
| 13 | void *obj; |
13 | klass *o; |
| 14 | void (object::*meth)(watcher &, int); |
14 | void (klass::*m)(watcher &, int); |
| 15 | |
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| 16 | /* a proxy is a kind of recipe on how to call a specific class method */ |
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| 17 | struct proxy_base { |
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| 18 | virtual void call (void *obj, void (object::*meth)(watcher &, int), watcher &w, int) const = 0; |
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| 19 | }; |
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| 20 | template<class O1, class O2> |
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| 21 | struct proxy : proxy_base { |
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| 22 | virtual void call (void *obj, void (object::*meth)(watcher &, int), watcher &w, int e) const |
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| 23 | { |
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| 24 | ((reinterpret_cast<O1 *>(obj)) ->* (reinterpret_cast<void (O2::*)(watcher &, int)>(meth))) |
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| 25 | (w, e); |
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| 26 | } |
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| 27 | }; |
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| 28 | |
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| 29 | proxy_base *prxy; |
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| 30 | |
15 | |
| 31 | public: |
16 | public: |
| 32 | template<class O1, class O2> |
17 | template<class O1, class O2> |
| 33 | explicit callback (O1 *object, void (O2::*method)(watcher &, int)) |
18 | explicit callback (O1 *object, void (O2::*method)(watcher &, int)) |
| 34 | { |
19 | { |
| 35 | static proxy<O1,O2> p; |
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| 36 | obj = reinterpret_cast<void *>(object); |
20 | o = reinterpret_cast<klass *>(object); |
| 37 | meth = reinterpret_cast<void (object::*)(watcher &, int)>(method); |
21 | m = reinterpret_cast<void (klass::*)(watcher &, int)>(method); |
| 38 | prxy = &p; |
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| 39 | } |
22 | } |
| 40 | |
23 | |
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24 | // this works because a standards-compliant C++ compiler |
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25 | // basically can't help it: it doesn't have the knowledge |
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26 | // required to miscompile (klass is not defined anywhere |
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27 | // and nothing is known about the constructor arguments) :) |
| 41 | void call (watcher *w, int e) const |
28 | void call (watcher *w, int revents) |
| 42 | { |
29 | { |
| 43 | return prxy->call (obj, meth, *w, e); |
30 | (o->*m) (*w, revents); |
| 44 | } |
31 | } |
| 45 | }; |
32 | }; |
| 46 | |
33 | |
| 47 | enum { |
34 | enum { |
| 48 | UNDEF = EV_UNDEF, |
35 | UNDEF = EV_UNDEF, |
| … | |
… | |
| 50 | READ = EV_READ, |
37 | READ = EV_READ, |
| 51 | WRITE = EV_WRITE, |
38 | WRITE = EV_WRITE, |
| 52 | TIMEOUT = EV_TIMEOUT, |
39 | TIMEOUT = EV_TIMEOUT, |
| 53 | PERIODIC = EV_PERIODIC, |
40 | PERIODIC = EV_PERIODIC, |
| 54 | SIGNAL = EV_SIGNAL, |
41 | SIGNAL = EV_SIGNAL, |
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42 | CHILD = EV_CHILD, |
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43 | STAT = EV_STAT, |
| 55 | IDLE = EV_IDLE, |
44 | IDLE = EV_IDLE, |
| 56 | CHECK = EV_CHECK, |
45 | CHECK = EV_CHECK, |
| 57 | PREPARE = EV_PREPARE, |
46 | PREPARE = EV_PREPARE, |
| 58 | CHILD = EV_CHILD, |
47 | FORK = EV_FORK, |
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48 | EMBED = EV_EMBED, |
| 59 | ERROR = EV_ERROR, |
49 | ERROR = EV_ERROR, |
| 60 | }; |
50 | }; |
| 61 | |
51 | |
| 62 | typedef ev_tstamp tstamp; |
52 | typedef ev_tstamp tstamp; |
| 63 | |
53 | |
| … | |
… | |
| 304 | ev_embed_sweep (EV_A_ static_cast<ev_embed *>(this)); |
294 | ev_embed_sweep (EV_A_ static_cast<ev_embed *>(this)); |
| 305 | } |
295 | } |
| 306 | EV_END_WATCHER (embed, embed) |
296 | EV_END_WATCHER (embed, embed) |
| 307 | #endif |
297 | #endif |
| 308 | |
298 | |
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299 | #if EV_FORK_ENABLE |
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300 | EV_BEGIN_WATCHER (fork, fork) |
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301 | void set () { } |
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302 | EV_END_WATCHER (fork, fork) |
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303 | #endif |
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304 | |
| 309 | #undef EV_CONSTRUCT |
305 | #undef EV_CONSTRUCT |
| 310 | #undef EV_BEGIN_WATCHER |
306 | #undef EV_BEGIN_WATCHER |
| 311 | #undef EV_END_WATCHER |
307 | #undef EV_END_WATCHER |
| 312 | } |
308 | } |
| 313 | |
309 | |
