document c++ callbacks!

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

diff --git a/ev++.h b/ev++.h
index 9d0df26c9e1d74ea722d95daa9503cf912662ed5..fea0ac170ee85850d318d50d643a8ee5acbf14f9 100644 (file)
--- a/ev++.h
+++ b/ev++.h
@@ -5,42 +5,84 @@
 
 namespace ev {
 
 
 namespace ev {
 

-  template<class watcher>
-  class callback
+  template<class ev_watcher, class watcher>
+  struct base : ev_watcher

   {
   {

-    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
+    #if EV_MULTIPLICITY
+      EV_P;
+
+      void set (EV_P)

       {
       {

-        ((reinterpret_cast<O1 *>(obj)) ->* (reinterpret_cast<void (O2::*)(watcher &, int)>(meth)))
-          (w, e);
+        this->EV_A = EV_A;

       }
       }

-    };
+    #endif

 
 

-    proxy_base *prxy;
+    base ()
+    {
+      ev_init (this, 0);
+    }

 
 

-  public:
-    template<class O1, class O2>
-    explicit callback (O1 *object, void (O2::*method)(watcher &, int))
+    void set_ (void *object, void (*cb)(EV_P_ ev_watcher *w, int revents))
+    {
+      this->data = object;
+      ev_set_cb (static_cast<ev_watcher *>(this), cb);
+    }
+
+    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)
+    {
+      watcher *self = static_cast<watcher *>(w);
+      K *obj = static_cast<K *>(self->data);
+      (obj->*method) (*self, revents);
+    }
+
+    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)

     {
     {

-      static proxy<O1,O2> p;
-      obj  = reinterpret_cast<void *>(object);
-      meth = reinterpret_cast<void (object::*)(watcher &, int)>(method);
-      prxy = &p;
+      watcher *self = static_cast<watcher *>(w);
+      K *obj = static_cast<K *>(self->data);
+      (obj->*method) (*self, revents);

     }
 
     }
 

-    void call (watcher *w, int e) const
+    template<void (*function)(watcher &w, int), void *data = 0>
+    void set ()

     {
     {

-      return prxy->call (obj, meth, *w, e);
+      set_ (data, function_thunk<function>);
+    }
+
+    template<void (*function)(watcher &w, int)>
+    static void function_thunk (EV_P_ ev_watcher *w, int revents)
+    {
+      watcher *self = static_cast<watcher *>(w);
+      function (*self, revents);
+    }
+
+    void operator ()(int events = EV_UNDEF)
+    {
+      return ev_cb (static_cast<ev_watcher *>(this))
+        (static_cast<ev_watcher *>(this), events);
+    }
+
+    bool is_active () const
+    {
+      return ev_is_active (static_cast<const ev_watcher *>(this));
+    }
+
+    bool is_pending () const
+    {
+      return ev_is_pending (static_cast<const ev_watcher *>(this));

     }
   };
 
     }
   };
 


@@ -52,10 +94,13 @@ namespace ev {
     TIMEOUT  = EV_TIMEOUT,
     PERIODIC = EV_PERIODIC,
     SIGNAL   = EV_SIGNAL,
     TIMEOUT  = EV_TIMEOUT,
     PERIODIC = EV_PERIODIC,
     SIGNAL   = EV_SIGNAL,

+    CHILD    = EV_CHILD,
+    STAT     = EV_STAT,

     IDLE     = EV_IDLE,
     CHECK    = EV_CHECK,
     PREPARE  = EV_PREPARE,
     IDLE     = EV_IDLE,
     CHECK    = EV_CHECK,
     PREPARE  = EV_PREPARE,

-    CHILD    = EV_CHILD,
+    FORK     = EV_FORK,
+    EMBED    = EV_EMBED,

     ERROR    = EV_ERROR,
   };
 
     ERROR    = EV_ERROR,
   };
 


@@ -67,49 +112,24 @@ namespace ev {
   }
 
   #if EV_MULTIPLICITY
   }
 
   #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
   #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)                                              \
                                                                                         \
   #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));                 \
     void start ()                                                                       \
     {                                                                                   \
       ev_ ## cstem ## _start (EV_A_ static_cast<ev_ ## cstem *>(this));                 \


@@ -120,29 +140,22 @@ namespace ev {
       ev_ ## cstem ## _stop (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 ();                                                                          \
     }                                                                                   \
                                                                                         \
                                                                                         \
     ~cppstem ()                                                                         \
     {                                                                                   \
       stop ();                                                                          \
     }                                                                                   \
                                                                                         \

+    using base<ev_ ## cstem, cppstem>::set;                                             \
+                                                                                        \

   private:                                                                              \
                                                                                         \
     cppstem (const cppstem &o)                                                         \
   private:                                                                              \
                                                                                         \
     cppstem (const cppstem &o)                                                         \

-    : callback<cppstem> (this, (void (cppstem::*)(cppstem &, int))0)                    \

     { /* disabled */ }                                                                 \
                                                                                         \
     void operator =(const cppstem &o) { /* disabled */ }                                \
                                                                                         \
     { /* 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)                                                        \
   public:
 
   #define EV_END_WATCHER(cppstem,cstem)                                                        \


@@ -260,6 +273,7 @@ namespace ev {
 
     void start (const char *path, ev_tstamp interval = 0.)
     {
 
     void start (const char *path, ev_tstamp interval = 0.)
     {

+      stop ();

       set (path, interval);
       start ();
     }
       set (path, interval);
       start ();
     }


@@ -285,17 +299,10 @@ namespace ev {
 
   #if EV_EMBED_ENABLE
   EV_BEGIN_WATCHER (embed, embed)
 
   #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)
     {
     void start (struct ev_loop *embedded_loop)
     {

-      set (embedded_loop);
+      stop ();
+      ev_embed_set (static_cast<ev_embed *>(this), embedded_loop);

       start ();
     }
 
       start ();
     }
 


@@ -306,6 +313,12 @@ namespace ev {
   EV_END_WATCHER (embed, embed)
   #endif
 
   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_BEGIN_WATCHER
   #undef EV_END_WATCHER
   #undef EV_CONSTRUCT
   #undef EV_BEGIN_WATCHER
   #undef EV_END_WATCHER