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@ -5,29 +5,83 @@
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namespace ev {
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template<class watcher>
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class callback
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template<class ev_watcher, class watcher>
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struct base : ev_watcher
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{
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struct klass; // it is vital that this is never defined
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#if EV_MULTIPLICITY
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EV_P;
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klass *o;
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void (klass::*m)(watcher &, int);
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void set (EV_P)
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{
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this->EV_A = EV_A;
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}
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#endif
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public:
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template<class O1, class O2>
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explicit callback (O1 *object, void (O2::*method)(watcher &, int))
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base ()
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{
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ev_init (this, 0);
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}
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void set_ (void *object, void (*cb)(ev_watcher *w, int revents))
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{
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this->data = object;
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ev_set_cb (static_cast<ev_watcher *>(this), cb);
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}
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template<class K, void (K::*method)(watcher &w, int)>
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void set (K *object)
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{
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set_ (object, method_thunk<K, method>);
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}
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template<class K, void (K::*method)(watcher &w, int)>
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static void method_thunk (ev_watcher *w, int revents)
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{
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watcher *self = static_cast<watcher *>(w);
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K *obj = static_cast<K *>(self->data);
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(obj->*method) (*self, revents);
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}
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template<class K, void (K::*method)(watcher &w, int) const>
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void set (const K *object)
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{
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set_ (object, const_method_thunk<K, method>);
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}
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template<class K, void (K::*method)(watcher &w, int) const>
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static void const_method_thunk (ev_watcher *w, int revents)
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{
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watcher *self = static_cast<watcher *>(w);
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K *obj = static_cast<K *>(self->data);
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(obj->*method) (*self, revents);
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}
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template<void (*function)(watcher &w, int)>
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void set ()
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{
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set_ (0, function_thunk<function>);
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}
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template<void (*function)(watcher &w, int)>
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static void function_thunk (ev_watcher *w, int revents)
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{
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watcher *self = static_cast<watcher *>(w);
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function (*self, revents);
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}
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void operator ()(int events = EV_UNDEF)
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{
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o = reinterpret_cast<klass *>(object);
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m = reinterpret_cast<void (klass::*)(watcher &, int)>(method);
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return e_cb (static_cast<ev_watcher *>(this)) (events);
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}
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// this works because a standards-compliant C++ compiler
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// basically can't help it: it doesn't have the knowledge
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// required to miscompile (klass is not defined anywhere
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// and nothing is known about the constructor arguments) :)
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void call (watcher *w, int revents)
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bool is_active () const
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{
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(o->*m) (*w, revents);
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return ev_is_active (static_cast<const ev_watcher *>(this));
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}
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bool is_pending () const
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{
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return ev_is_pending (static_cast<const ev_watcher *>(this));
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}
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};
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@ -57,49 +111,24 @@ namespace ev {
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}
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#if EV_MULTIPLICITY
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#define EV_CONSTRUCT(cppstem) \
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EV_P; \
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\
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void set (EV_P) \
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#define EV_CONSTRUCT \
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(EV_P = EV_DEFAULT) \
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{ \
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this->EV_A = EV_A; \
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} \
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\
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template<class O1, class O2> \
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explicit cppstem (O1 *object, void (O2::*method)(cppstem &, int), EV_P = ev_default_loop (0)) \
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: callback<cppstem> (object, method), EV_A (EV_A)
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set (EV_A); \
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}
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#else
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#define EV_CONSTRUCT(cppstem) \
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template<class O1, class O2> \
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explicit cppstem (O1 *object, void (O2::*method)(cppstem &, int)) \
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: callback<cppstem> (object, method)
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#define EV_CONSTRUCT \
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() \
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{ \
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}
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#endif
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/* using a template here would require quite a bit more lines,
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* so a macro solution was chosen */
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#define EV_BEGIN_WATCHER(cppstem,cstem) \
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\
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struct cppstem : ev_ ## cstem, callback<cppstem> \
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struct cppstem : base<ev_ ## cstem, cppstem> \
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{ \
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EV_CONSTRUCT (cppstem) \
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{ \
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ev_init (static_cast<ev_ ## cstem *>(this), thunk); \
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} \
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\
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bool is_active () const \
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{ \
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return ev_is_active (static_cast<const ev_ ## cstem *>(this)); \
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} \
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\
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bool is_pending () const \
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{ \
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return ev_is_pending (static_cast<const ev_ ## cstem *>(this)); \
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} \
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\
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void start () \
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{ \
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ev_ ## cstem ## _start (EV_A_ static_cast<ev_ ## cstem *>(this)); \
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@ -110,29 +139,22 @@ namespace ev {
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ev_ ## cstem ## _stop (EV_A_ static_cast<ev_ ## cstem *>(this)); \
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} \
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\
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void operator ()(int events = EV_UNDEF) \
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{ \
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return call (this, events); \
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} \
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cppstem EV_CONSTRUCT \
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\
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~cppstem () \
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{ \
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stop (); \
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} \
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\
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using base<ev_ ## cstem, cppstem>::set; \
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\
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private: \
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\
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cppstem (const cppstem &o) \
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: callback<cppstem> (this, (void (cppstem::*)(cppstem &, int))0) \
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{ /* disabled */ } \
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\
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void operator =(const cppstem &o) { /* disabled */ } \
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\
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static void thunk (EV_P_ struct ev_ ## cstem *w, int revents) \
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{ \
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(*static_cast<cppstem *>(w))(revents); \
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} \
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\
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public:
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#define EV_END_WATCHER(cppstem,cstem) \
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Marc Alexander Lehmann
16 years ago