+/*
+ * libev simple C++ wrapper classes
+ *
+ * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modifica-
+ * tion, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
+ * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
+ * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
+ * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * the GNU General Public License ("GPL") version 2 or any later version,
+ * in which case the provisions of the GPL are applicable instead of
+ * the above. If you wish to allow the use of your version of this file
+ * only under the terms of the GPL and not to allow others to use your
+ * version of this file under the BSD license, indicate your decision
+ * by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL. If you do not delete the
+ * provisions above, a recipient may use your version of this file under
+ * either the BSD or the GPL.
+ */
+
#ifndef EVPP_H__
#define EVPP_H__
-#include "ev.h"
+#ifdef EV_H
+# include EV_H
+#else
+# include "ev.h"
+#endif
namespace ev {
- template<class watcher>
- class callback
+ template<class ev_watcher, class watcher>
+ struct base : ev_watcher
{
- struct klass; // it is vital that this is never defined
+ #if EV_MULTIPLICITY
+ EV_P;
- klass *o;
- void (klass::*m)(watcher &, int);
+ void set (EV_P)
+ {
+ this->EV_A = EV_A;
+ }
+ #endif
- public:
- template<class O1, class O2>
- explicit callback (O1 *object, void (O2::*method)(watcher &, int))
+ base ()
+ {
+ ev_init (this, 0);
+ }
+
+ void set_ (void *data, void (*cb)(EV_P_ ev_watcher *w, int revents))
+ {
+ this->data = data;
+ ev_set_cb (static_cast<ev_watcher *>(this), cb);
+ }
+
+ // method callback
+ template<class K, void (K::*method)(watcher &w, int)>
+ void set (K *object)
+ {
+ set_ (object, method_thunk<K, method>);
+ }
+
+ template<class K, void (K::*method)(watcher &w, int)>
+ static void method_thunk (EV_P_ ev_watcher *w, int revents)
+ {
+ K *obj = static_cast<K *>(w->data);
+ (obj->*method) (*static_cast<watcher *>(w), revents);
+ }
+
+ // const method callback
+ template<class K, void (K::*method)(watcher &w, int) const>
+ void set (const K *object)
+ {
+ set_ (object, const_method_thunk<K, method>);
+ }
+
+ template<class K, void (K::*method)(watcher &w, int) const>
+ static void const_method_thunk (EV_P_ ev_watcher *w, int revents)
+ {
+ K *obj = static_cast<K *>(w->data);
+ (static_cast<K *>(w->data)->*method) (*static_cast<watcher *>(w), revents);
+ }
+
+ // function callback
+ template<void (*function)(watcher &w, int)>
+ void set (void *data = 0)
+ {
+ set_ (data, function_thunk<function>);
+ }
+
+ template<void (*function)(watcher &w, int)>
+ static void function_thunk (EV_P_ ev_watcher *w, int revents)
+ {
+ function (*static_cast<watcher *>(w), revents);
+ }
+
+ // simple callback
+ template<class K, void (K::*method)()>
+ void set (K *object)
+ {
+ set_ (object, method_noargs_thunk<K, method>);
+ }
+
+ template<class K, void (K::*method)()>
+ static void method_noargs_thunk (EV_P_ ev_watcher *w, int revents)
+ {
+ K *obj = static_cast<K *>(w->data);
+ (obj->*method) ();
+ }
+
+ void operator ()(int events = EV_UNDEF)
+ {
+ return ev_cb (static_cast<ev_watcher *>(this))
+ (static_cast<ev_watcher *>(this), events);
+ }
+
+ bool is_active () const
{
- o = reinterpret_cast<klass *>(object);
- m = reinterpret_cast<void (klass::*)(watcher &, int)>(method);
+ return ev_is_active (static_cast<const ev_watcher *>(this));
}
- // this works because a standards-compliant C++ compiler
- // basically can't help it: it doesn't have the knowledge
- // required to miscompile (klass is not defined anywhere
- // and nothing is known about the constructor arguments) :)
- void call (watcher *w, int revents)
+ bool is_pending () const
{
- (o->*m) (*w, revents);
+ return ev_is_pending (static_cast<const ev_watcher *>(this));
}
};
}
#if EV_MULTIPLICITY
-
- #define EV_CONSTRUCT(cppstem) \
- EV_P; \
- \
- void set (EV_P) \
+ #define EV_CONSTRUCT \
+ (EV_P = EV_DEFAULT) \
{ \
- 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)
-
+ set (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)
-
+ #define EV_CONSTRUCT \
+ () \
+ { \
+ }
#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> \
+ struct cppstem : base<ev_ ## cstem, 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)); \
ev_ ## cstem ## _stop (EV_A_ static_cast<ev_ ## cstem *>(this)); \
} \
\
- void operator ()(int events = EV_UNDEF) \
- { \
- return call (this, events); \
- } \
+ cppstem EV_CONSTRUCT \
\
~cppstem () \
{ \
stop (); \
} \
\
+ using base<ev_ ## cstem, cppstem>::set; \
+ \
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) \
void start (const char *path, ev_tstamp interval = 0.)
{
+ stop ();
set (path, interval);
start ();
}
#if EV_EMBED_ENABLE
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);
+ stop ();
+ ev_embed_set (static_cast<ev_embed *>(this), embedded_loop);
start ();
}
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