Add exceptions support to C++ interface.

Add exception specification and a ev::bad_loop exception that is thrown
when a loop can't be initialized.

1 files changed, 111 insertions, 78 deletions

diff --git a/ev++.h b/ev++.h
index 889603a..f62aac4 100644
--- a/ev++.h
+++ b/ev++.h
@@ -46,6 +46,18 @@
 # include "ev.h"
 #endif
 
+#ifndef EV_CXX_EXCEPTIONS
+#define EV_CXX_EXCEPTIONS 1
+#endif
+
+#undef EV_THROW
+#if EV_CXX_EXCEPTIONS
+#  include <stdexcept>
+#  define EV_THROW(exception) throw (exception)
+#else
+#  define EV_THROW(exception)
+#endif
+
 namespace ev {
 
   typedef ev_tstamp tstamp;
@@ -93,6 +105,14 @@ namespace ev {
     ALL = EVUNLOOP_ALL
   };
 
+#if EV_CXX_EXCEPTIONS
+  struct bad_loop: std::runtime_error
+  {
+    bad_loop()
+      : std::runtime_error("loop can't be initialized") {}
+  };
+#endif
+
 #ifdef EV_AX
 #  undef EV_AX
 #endif
@@ -114,12 +134,16 @@ namespace ev {
 
     loop_ref (EV_P)
 #if EV_MULTIPLICITY
-      : EV_AX (EV_A)
+      EV_THROW (bad_loop) : EV_AX (EV_A)
 #endif
     {
+#if EV_MULTIPLICIY && EV_CXX_EXCEPTIONS
+      if (!EV_A)
+        throw bad_loop ();
+#endif
     }
 
-    bool operator== (const loop_ref &other) const
+    bool operator== (const loop_ref &other) const EV_THROW ()
     {
 #if EV_MULTIPLICITY
       return this->EV_AX == other.EV_AX;
@@ -128,7 +152,7 @@ namespace ev {
 #endif
     }
 
-    bool operator!= (const loop_ref &other) const
+    bool operator!= (const loop_ref &other) const EV_THROW ()
     {
 #if EV_MULTIPLICITY
       return ! (*this == other);
@@ -138,37 +162,37 @@ namespace ev {
     }
 
 #if EV_MULTIPLICITY
-    bool operator== (struct ev_loop *other) const
+    bool operator== (struct ev_loop *other) const EV_THROW ()
     {
       return this->EV_AX == other;
     }
 
-    bool operator!= (struct ev_loop *other) const
+    bool operator!= (struct ev_loop *other) const EV_THROW ()
     {
       return ! (*this == other);
     }
 
-    bool operator== (const struct ev_loop *other) const
+    bool operator== (const struct ev_loop *other) const EV_THROW ()
     {
       return this->EV_AX == other;
     }
 
-    bool operator!= (const struct ev_loop *other) const
+    bool operator!= (const struct ev_loop *other) const EV_THROW ()
     {
       return (*this == other);
     }
 
-    operator struct ev_loop * () const
+    operator struct ev_loop * () const EV_THROW ()
     {
       return EV_AX;
     }
 
-    operator const struct ev_loop * () const
+    operator const struct ev_loop * () const EV_THROW ()
     {
       return EV_AX;
     }
 
-    bool is_default () const
+    bool is_default () const EV_THROW ()
     {
       return EV_AX == ev_default_loop (0);
     }
@@ -179,12 +203,12 @@ namespace ev {
       ev_loop (EV_AX_ flags);
     }
 
-    void unloop (how_t how = ONE)
+    void unloop (how_t how = ONE) EV_THROW ()
     {
       ev_unloop (EV_AX_ how);
     }
 
-    void post_fork ()
+    void post_fork () EV_THROW ()
     {
 #if EV_MULTIPLICITY
       ev_loop_fork (EV_AX);
@@ -193,50 +217,50 @@ namespace ev {
 #endif
     }
 
-    unsigned int count () const
+    unsigned int count () const EV_THROW ()
     {
       return ev_loop_count (EV_AX);
     }
 
-    unsigned int backend () const
+    unsigned int backend () const EV_THROW ()
     {
       return ev_backend (EV_AX);
     }
 
-    tstamp now () const
+    tstamp now () const EV_THROW ()
     {
       return ev_now (EV_AX);
     }
 
-    void ref ()
+    void ref () EV_THROW ()
     {
       ev_ref (EV_AX);
     }
 
-    void unref ()
+    void unref () EV_THROW ()
     {
       ev_unref (EV_AX);
     }
 
-    void set_io_collect_interval (tstamp interval)
+    void set_io_collect_interval (tstamp interval) EV_THROW ()
     {
       ev_set_io_collect_interval (EV_AX_ interval);
     }
 
-    void set_timeout_collect_interval (tstamp interval)
+    void set_timeout_collect_interval (tstamp interval) EV_THROW ()
     {
       ev_set_timeout_collect_interval (EV_AX_ interval);
     }
 
     // function callback
-    void once (int fd, int events, tstamp timeout, void (*cb)(int, void *), void* arg = 0)
+    void once (int fd, int events, tstamp timeout, void (*cb)(int, void *), void* arg = 0) EV_THROW ()
     {
       ev_once (EV_AX_ fd, events, timeout, cb, arg);
     }
 
     // method callback
     template<class K, void (K::*method)(int)>
-    void once (int fd, int events, tstamp timeout, K *object)
+    void once (int fd, int events, tstamp timeout, K *object) EV_THROW ()
     {
       once (fd, events, timeout, method_thunk<K, method>, object);
     }
@@ -250,7 +274,7 @@ namespace ev {
 
     // const method callback
     template<class K, void (K::*method)(int) const>
-    void once (int fd, int events, tstamp timeout, const K *object)
+    void once (int fd, int events, tstamp timeout, const K *object) EV_THROW ()
     {
       once (fd, events, timeout, const_method_thunk<K, method>, object);
     }
@@ -264,7 +288,7 @@ namespace ev {
 
     // simple method callback
     template<class K, void (K::*method)()>
-    void once (int fd, int events, tstamp timeout, K *object)
+    void once (int fd, int events, tstamp timeout, K *object) EV_THROW ()
     {
       once (fd, events, timeout, method_noargs_thunk<K, method>, object);
     }
@@ -278,7 +302,7 @@ namespace ev {
 
     // simpler function callback
     template<void (*cb)(int)>
-    void once (int fd, int events, tstamp timeout)
+    void once (int fd, int events, tstamp timeout) EV_THROW ()
     {
       once (fd, events, timeout, simpler_func_thunk<cb>);
     }
@@ -291,7 +315,7 @@ namespace ev {
 
     // simplest function callback
     template<void (*cb)()>
-    void once (int fd, int events, tstamp timeout)
+    void once (int fd, int events, tstamp timeout) EV_THROW ()
     {
       once (fd, events, timeout, simplest_func_thunk<cb>);
     }
@@ -302,12 +326,12 @@ namespace ev {
       (*cb) ();
     }
 
-    void feed_fd_event (int fd, int revents)
+    void feed_fd_event (int fd, int revents) EV_THROW ()
     {
       ev_feed_fd_event (EV_AX_ fd, revents);
     }
 
-    void feed_signal_event (int signum)
+    void feed_signal_event (int signum) EV_THROW ()
     {
       ev_feed_signal_event (EV_AX_ signum);
     }
@@ -322,12 +346,12 @@ namespace ev {
   struct dynamic_loop: loop_ref
   {
 
-    dynamic_loop (unsigned int flags = AUTO)
+    dynamic_loop (unsigned int flags = AUTO) EV_THROW (bad_loop)
       : loop_ref (ev_loop_new (flags))
     {
     }
 
-    ~dynamic_loop ()
+    ~dynamic_loop () EV_THROW ()
     {
       ev_loop_destroy (EV_AX);
       EV_AX = 0;
@@ -345,18 +369,25 @@ namespace ev {
   struct default_loop: loop_ref
   {
 
-    default_loop (unsigned int flags = AUTO)
+    default_loop (unsigned int flags = AUTO) EV_THROW (bad_loop)
 #if EV_MULTIPLICITY
       : loop_ref (ev_default_loop (flags))
     {
     }
 #else
     {
-      ev_default_loop (flags);
+    #if EV_CXX_EXCEPTIONS
+      int r =
+    #endif
+          ev_default_loop (flags);
+    #if EV_CXX_EXCEPTIONS
+      if (!r)
+        throw bad_loop ();
+    #endif
     }
 #endif
 
-    ~default_loop ()
+    ~default_loop () EV_THROW ()
     {
       ev_default_destroy ();
 #if EV_MULTIPLICITY
@@ -372,7 +403,7 @@ namespace ev {
 
   };
 
-  inline loop_ref get_default_loop ()
+  inline loop_ref get_default_loop () EV_THROW ()
   {
 #if EV_MULTIPLICITY
     return ev_default_loop (0);
@@ -400,13 +431,13 @@ namespace ev {
     #if EV_MULTIPLICITY
       EV_PX;
 
-      void set (EV_PX)
+      void set (EV_PX) EV_THROW ()
       {
         this->EV_A = EV_A;
       }
     #endif
 
-    base (EV_PX)
+    base (EV_PX) EV_THROW ()
     #if EV_MULTIPLICITY
       : EV_A (EV_A)
     #endif
@@ -414,7 +445,7 @@ namespace ev {
       ev_init (this, 0);
     }
 
-    void set_ (void *data, void (*cb)(EV_P_ ev_watcher *w, int revents))
+    void set_ (void *data, void (*cb)(EV_P_ ev_watcher *w, int revents)) EV_THROW ()
     {
       this->data = data;
       ev_set_cb (static_cast<ev_watcher *>(this), cb);
@@ -422,7 +453,7 @@ namespace ev {
 
     // method callback
     template<class K, void (K::*method)(watcher &w, int)>
-    void set (K *object)
+    void set (K *object) EV_THROW ()
     {
       set_ (object, method_thunk<K, method>);
     }
@@ -436,7 +467,7 @@ namespace ev {
 
     // const method callback
     template<class K, void (K::*method)(watcher &w, int) const>
-    void set (const K *object)
+    void set (const K *object) EV_THROW ()
     {
       set_ (object, const_method_thunk<K, method>);
     }
@@ -450,7 +481,7 @@ namespace ev {
 
     // function callback
     template<void (*function)(watcher &w, int)>
-    void set (void *data = 0)
+    void set (void *data = 0) EV_THROW ()
     {
       set_ (data, function_thunk<function>);
     }
@@ -463,7 +494,7 @@ namespace ev {
 
     // simple callback
     template<class K, void (K::*method)()>
-    void set (K *object)
+    void set (K *object) EV_THROW ()
     {
       set_ (object, method_noargs_thunk<K, method>);
     }
@@ -481,76 +512,76 @@ namespace ev {
         (static_cast<ev_watcher *>(this), events);
     }
 
-    bool is_active () const
+    bool is_active () const EV_THROW ()
     {
       return ev_is_active (static_cast<const ev_watcher *>(this));
     }
 
-    bool is_pending () const
+    bool is_pending () const EV_THROW ()
     {
       return ev_is_pending (static_cast<const ev_watcher *>(this));
     }
 
-    void feed_event (int revents)
+    void feed_event (int revents) EV_THROW ()
     {
       ev_feed_event (EV_A_ static_cast<const ev_watcher *>(this), revents);
     }
   };
 
-  inline tstamp now ()
+  inline tstamp now () EV_THROW ()
   {
     return ev_time ();
   }
 
-  inline void delay (tstamp interval)
+  inline void delay (tstamp interval) EV_THROW ()
   {
     ev_sleep (interval);
   }
 
-  inline int version_major ()
+  inline int version_major () EV_THROW ()
   {
     return ev_version_major ();
   }
 
-  inline int version_minor ()
+  inline int version_minor () EV_THROW ()
   {
     return ev_version_minor ();
   }
 
-  inline unsigned int supported_backends ()
+  inline unsigned int supported_backends () EV_THROW ()
   {
     return ev_supported_backends ();
   }
 
-  inline unsigned int recommended_backends ()
+  inline unsigned int recommended_backends () EV_THROW ()
   {
     return ev_recommended_backends ();
   }
 
-  inline unsigned int embeddable_backends ()
+  inline unsigned int embeddable_backends () EV_THROW ()
   {
     return ev_embeddable_backends ();
   }
 
-  inline void set_allocator (void *(*cb)(void *ptr, long size))
+  inline void set_allocator (void *(*cb)(void *ptr, long size)) EV_THROW ()
   {
     ev_set_allocator (cb);
   }
 
-  inline void set_syserr_cb (void (*cb)(const char *msg))
+  inline void set_syserr_cb (void (*cb)(const char *msg)) EV_THROW ()
   {
     ev_set_syserr_cb (cb);
   }
 
   #if EV_MULTIPLICITY
     #define EV_CONSTRUCT(cppstem,cstem)	                                                \
-      (EV_PX = get_default_loop ())                                                     \
+      (EV_PX = get_default_loop ()) EV_THROW ()                                         \
         : base<ev_ ## cstem, cppstem> (EV_A)                                            \
       {                                                                                 \
       }
   #else
     #define EV_CONSTRUCT(cppstem,cstem)                                                 \
-      ()                                                                                \
+      () EV_THROW ()                                                                    \
       {                                                                                 \
       }
   #endif
@@ -561,19 +592,19 @@ namespace ev {
                                                                                         \
   struct cppstem : base<ev_ ## cstem, cppstem>                                          \
   {                                                                                     \
-    void start ()                                                                       \
+    void start () EV_THROW ()                                                           \
     {                                                                                   \
       ev_ ## cstem ## _start (EV_A_ static_cast<ev_ ## cstem *>(this));                 \
     }                                                                                   \
                                                                                         \
-    void stop ()                                                                        \
+    void stop () EV_THROW ()                                                            \
     {                                                                                   \
       ev_ ## cstem ## _stop (EV_A_ static_cast<ev_ ## cstem *>(this));                  \
     }                                                                                   \
                                                                                         \
     cppstem EV_CONSTRUCT(cppstem,cstem)                                                 \
                                                                                         \
-    ~cppstem ()                                                                         \
+    ~cppstem () EV_THROW ()                                                             \
     {                                                                                   \
       stop ();                                                                          \
     }                                                                                   \
@@ -592,7 +623,7 @@ namespace ev {
   };
 
   EV_BEGIN_WATCHER (io, io)
-    void set (int fd, int events)
+    void set (int fd, int events) EV_THROW ()
     {
       int active = is_active ();
       if (active) stop ();
@@ -600,7 +631,7 @@ namespace ev {
       if (active) start ();
     }
 
-    void set (int events)
+    void set (int events) EV_THROW ()
     {
       int active = is_active ();
       if (active) stop ();
@@ -608,7 +639,7 @@ namespace ev {
       if (active) start ();
     }
 
-    void start (int fd, int events)
+    void start (int fd, int events) EV_THROW ()
     {
       set (fd, events);
       start ();
@@ -616,7 +647,7 @@ namespace ev {
   EV_END_WATCHER (io, io)
 
   EV_BEGIN_WATCHER (timer, timer)
-    void set (ev_tstamp after, ev_tstamp repeat = 0.)
+    void set (ev_tstamp after, ev_tstamp repeat = 0.) EV_THROW ()
     {
       int active = is_active ();
       if (active) stop ();
@@ -624,13 +655,13 @@ namespace ev {
       if (active) start ();
     }
 
-    void start (ev_tstamp after, ev_tstamp repeat = 0.)
+    void start (ev_tstamp after, ev_tstamp repeat = 0.) EV_THROW ()
     {
       set (after, repeat);
       start ();
     }
 
-    void again ()
+    void again () EV_THROW ()
     {
       ev_timer_again (EV_A_ static_cast<ev_timer *>(this));
     }
@@ -638,7 +669,7 @@ namespace ev {
 
   #if EV_PERIODIC_ENABLE
   EV_BEGIN_WATCHER (periodic, periodic)
-    void set (ev_tstamp at, ev_tstamp interval = 0.)
+    void set (ev_tstamp at, ev_tstamp interval = 0.) EV_THROW ()
     {
       int active = is_active ();
       if (active) stop ();
@@ -646,13 +677,13 @@ namespace ev {
       if (active) start ();
     }
 
-    void start (ev_tstamp at, ev_tstamp interval = 0.)
+    void start (ev_tstamp at, ev_tstamp interval = 0.) EV_THROW ()
     {
       set (at, interval);
       start ();
     }
 
-    void again ()
+    void again () EV_THROW ()
     {
       ev_periodic_again (EV_A_ static_cast<ev_periodic *>(this));
     }
@@ -660,7 +691,7 @@ namespace ev {
   #endif
 
   EV_BEGIN_WATCHER (sig, signal)
-    void set (int signum)
+    void set (int signum) EV_THROW ()
     {
       int active = is_active ();
       if (active) stop ();
@@ -668,7 +699,7 @@ namespace ev {
       if (active) start ();
     }
 
-    void start (int signum)
+    void start (int signum) EV_THROW ()
     {
       set (signum);
       start ();
@@ -676,7 +707,7 @@ namespace ev {
   EV_END_WATCHER (sig, signal)
 
   EV_BEGIN_WATCHER (child, child)
-    void set (int pid)
+    void set (int pid) EV_THROW ()
     {
       int active = is_active ();
       if (active) stop ();
@@ -684,7 +715,7 @@ namespace ev {
       if (active) start ();
     }
 
-    void start (int pid)
+    void start (int pid) EV_THROW ()
     {
       set (pid);
       start ();
@@ -693,7 +724,7 @@ namespace ev {
 
   #if EV_STAT_ENABLE
   EV_BEGIN_WATCHER (stat, stat)
-    void set (const char *path, ev_tstamp interval = 0.)
+    void set (const char *path, ev_tstamp interval = 0.) EV_THROW ()
     {
       int active = is_active ();
       if (active) stop ();
@@ -701,14 +732,14 @@ namespace ev {
       if (active) start ();
     }
 
-    void start (const char *path, ev_tstamp interval = 0.)
+    void start (const char *path, ev_tstamp interval = 0.) EV_THROW ()
     {
       stop ();
       set (path, interval);
       start ();
     }
 
-    void update ()
+    void update () EV_THROW ()
     {
       ev_stat_stat (EV_A_ static_cast<ev_stat *>(this));
     }
@@ -716,20 +747,20 @@ namespace ev {
   #endif
 
   EV_BEGIN_WATCHER (idle, idle)
-    void set () { }
+    void set () EV_THROW () { }
   EV_END_WATCHER (idle, idle)
 
   EV_BEGIN_WATCHER (prepare, prepare)
-    void set () { }
+    void set () EV_THROW () { }
   EV_END_WATCHER (prepare, prepare)
 
   EV_BEGIN_WATCHER (check, check)
-    void set () { }
+    void set () EV_THROW () { }
   EV_END_WATCHER (check, check)
 
   #if EV_EMBED_ENABLE
   EV_BEGIN_WATCHER (embed, embed)
-    void start (struct ev_loop *embedded_loop)
+    void start (struct ev_loop *embedded_loop) EV_THROW ()
     {
       stop ();
       ev_embed_set (static_cast<ev_embed *>(this), embedded_loop);
@@ -745,7 +776,7 @@ namespace ev {
 
   #if EV_FORK_ENABLE
   EV_BEGIN_WATCHER (fork, fork)
-    void set () { }
+    void set () EV_THROW () { }
   EV_END_WATCHER (fork, fork)
   #endif
 
@@ -757,5 +788,7 @@ namespace ev {
 
 }
 
+#undef EV_THROW
+
 #endif