unset cached value - anbody has a better idea to express this?

[software/libev.git] / ev++.h

diff --git a/ev++.h b/ev++.h
index 95d0a76d117d184b766fdbe67885506ae7f06f20..c51e161cc39d96718024b366098d4354a534e827 100644 (file)
--- a/ev++.h
+++ b/ev++.h
@@ -1,50 +1,53 @@
 #ifndef EVPP_H__
 #define EVPP_H__
 
 #ifndef EVPP_H__
 #define EVPP_H__
 

-/* work in progress, don't use unless you know what you are doing */
+#include "ev.h"

 
 namespace ev {
 
   template<class watcher>
   class callback
   {
 
 namespace ev {
 
   template<class watcher>
   class callback
   {

-    struct object { };
+    struct klass; // it is vital that this is never defined

 
 

-    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;
+    klass *o;
+    void (klass::*m)(watcher &, int);

 
   public:
     template<class O1, class O2>
     explicit callback (O1 *object, void (O2::*method)(watcher &, int))
     {
 
   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;
+      o = reinterpret_cast<klass *>(object);
+      m = reinterpret_cast<void (klass::*)(watcher &, int)>(method);

     }
 
     }
 

-    void call (watcher *w, int e) const
+    // 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)

     {
     {

-      return prxy->call (obj, meth, *w, e);
+      (o->*m) (*w, revents);

     }
   };
 
     }
   };
 

-  #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,
+    CHILD    = EV_CHILD,
+    STAT     = EV_STAT,
+    IDLE     = EV_IDLE,
+    CHECK    = EV_CHECK,
+    PREPARE  = EV_PREPARE,
+    FORK     = EV_FORK,
+    EMBED    = EV_EMBED,
+    ERROR    = EV_ERROR,
+  };

 
   typedef ev_tstamp tstamp;
 
 
   typedef ev_tstamp tstamp;
 


@@ -78,15 +81,13 @@ namespace ev {
 
   /* using a template here would require quite a bit more lines,
    * so a macro solution was chosen */
 
   /* 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);                 \
+  #define EV_BEGIN_WATCHER(cppstem,cstem)                                              \

                                                                                         \
   struct cppstem : ev_ ## cstem, callback<cppstem>                                      \
   {                                                                                     \
     EV_CONSTRUCT (cppstem)                                                              \
     {                                                                                   \
                                                                                         \
   struct cppstem : ev_ ## cstem, callback<cppstem>                                      \
   {                                                                                     \
     EV_CONSTRUCT (cppstem)                                                              \
     {                                                                                   \

-      ev_init (static_cast<ev_ ## cstem *>(this), cb_ ## cppstem);                      \
+      ev_init (static_cast<ev_ ## cstem *>(this), thunk);                               \

     }                                                                                   \
                                                                                         \
     bool is_active () const                                                             \
     }                                                                                   \
                                                                                         \
     bool is_active () const                                                             \


@@ -114,16 +115,30 @@ namespace ev {
       return call (this, events);                                                       \
     }                                                                                   \
                                                                                         \
       return call (this, events);                                                       \
     }                                                                                   \
                                                                                         \

+    ~cppstem ()                                                                         \
+    {                                                                                   \
+      stop ();                                                                          \
+    }                                                                                   \
+                                                                                        \

   private:                                                                              \
                                                                                         \
     cppstem (const cppstem &o)                                                         \
     : callback<cppstem> (this, (void (cppstem::*)(cppstem &, int))0)                    \
     { /* disabled */ }                                                                 \
   private:                                                                              \
                                                                                         \
     cppstem (const cppstem &o)                                                         \
     : callback<cppstem> (this, (void (cppstem::*)(cppstem &, int))0)                    \
     { /* disabled */ }                                                                 \

+                                                                                        \

     void operator =(const cppstem &o) { /* disabled */ }                                \
                                                                                         \
     void operator =(const cppstem &o) { /* disabled */ }                                \
                                                                                         \

+    static void thunk (EV_P_ struct ev_ ## cstem *w, int revents)                       \
+    {                                                                                   \
+      (*static_cast<cppstem *>(w))(revents);                                            \
+    }                                                                                   \
+                                                                                        \

   public:
 
   public:
 

-  EV_DECLARE_WATCHER (io, io)
+  #define EV_END_WATCHER(cppstem,cstem)                                                        \
+  };
+
+  EV_BEGIN_WATCHER (io, io)

     void set (int fd, int events)
     {
       int active = is_active ();
     void set (int fd, int events)
     {
       int active = is_active ();


@@ -145,9 +160,9 @@ namespace ev {
       set (fd, events);
       start ();
     }
       set (fd, events);
       start ();
     }

-  };
+  EV_END_WATCHER (io, io)

 
 

-  EV_DECLARE_WATCHER (timer, timer)
+  EV_BEGIN_WATCHER (timer, timer)

     void set (ev_tstamp after, ev_tstamp repeat = 0.)
     {
       int active = is_active ();
     void set (ev_tstamp after, ev_tstamp repeat = 0.)
     {
       int active = is_active ();


@@ -166,9 +181,10 @@ namespace ev {
     {
       ev_timer_again (EV_A_ static_cast<ev_timer *>(this));
     }
     {
       ev_timer_again (EV_A_ static_cast<ev_timer *>(this));
     }

-  };
+  EV_END_WATCHER (timer, timer)

 
 

-  EV_DECLARE_WATCHER (periodic, periodic)
+  #if EV_PERIODIC_ENABLE
+  EV_BEGIN_WATCHER (periodic, periodic)

     void set (ev_tstamp at, ev_tstamp interval = 0.)
     {
       int active = is_active ();
     void set (ev_tstamp at, ev_tstamp interval = 0.)
     {
       int active = is_active ();


@@ -187,18 +203,10 @@ namespace ev {
     {
       ev_periodic_again (EV_A_ static_cast<ev_periodic *>(this));
     }
     {
       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_END_WATCHER (periodic, periodic)
+  #endif

 
 

-  EV_DECLARE_WATCHER (sig, signal)
+  EV_BEGIN_WATCHER (sig, signal)

     void set (int signum)
     {
       int active = is_active ();
     void set (int signum)
     {
       int active = is_active ();


@@ -212,9 +220,9 @@ namespace ev {
       set (signum);
       start ();
     }
       set (signum);
       start ();
     }

-  };
+  EV_END_WATCHER (sig, signal)

 
 

-  EV_DECLARE_WATCHER (child, child)
+  EV_BEGIN_WATCHER (child, child)

     void set (int pid)
     {
       int active = is_active ();
     void set (int pid)
     {
       int active = is_active ();


@@ -228,10 +236,69 @@ namespace ev {
       set (pid);
       start ();
     }
       set (pid);
       start ();
     }

-  };
+  EV_END_WATCHER (child, child)
+
+  #if EV_STAT_ENABLE
+  EV_BEGIN_WATCHER (stat, stat)
+    void set (const char *path, ev_tstamp interval = 0.)
+    {
+      int active = is_active ();
+      if (active) stop ();
+      ev_stat_set (static_cast<ev_stat *>(this), path, interval);
+      if (active) start ();
+    }
+
+    void start (const char *path, ev_tstamp interval = 0.)
+    {
+      stop ();
+      set (path, interval);
+      start ();
+    }
+
+    void update ()
+    {
+      ev_stat_stat (EV_A_ static_cast<ev_stat *>(this));
+    }
+  EV_END_WATCHER (stat, stat)
+  #endif
+
+  EV_BEGIN_WATCHER (idle, idle)
+    void set () { }
+  EV_END_WATCHER (idle, idle)
+
+  EV_BEGIN_WATCHER (prepare, prepare)
+    void set () { }
+  EV_END_WATCHER (prepare, prepare)
+
+  EV_BEGIN_WATCHER (check, check)
+    void set () { }
+  EV_END_WATCHER (check, check)
+
+  #if EV_EMBED_ENABLE
+  EV_BEGIN_WATCHER (embed, embed)
+    void start (struct ev_loop *embedded_loop)
+    {
+      stop ();
+      ev_embed_set (static_cast<ev_embed *>(this), embedded_loop);
+      start ();
+    }
+
+    void sweep ()
+    {
+      ev_embed_sweep (EV_A_ static_cast<ev_embed *>(this));
+    }
+  EV_END_WATCHER (embed, embed)
+  #endif
+
+  #if EV_FORK_ENABLE
+  EV_BEGIN_WATCHER (fork, fork)
+    void set () { }
+  EV_END_WATCHER (fork, fork)
+  #endif

 
   #undef EV_CONSTRUCT
 
   #undef EV_CONSTRUCT

-  #undef EV_DECLARE_WATCHER
+  #undef EV_BEGIN_WATCHER
+  #undef EV_END_WATCHER

 }
 
 #endif
 }
 
 #endif