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document c++ callbacks!

master
Marc Alexander Lehmann 2007-12-07 20:13:08 +00:00
parent e8b0d7f756
commit 19fc194840
4 changed files with 205 additions and 60 deletions
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4
ev++.h
View File

@ -56,10 +56,10 @@ namespace ev {
(obj->*method) (*self, revents);
}
template<void (*function)(watcher &w, int)>
template<void (*function)(watcher &w, int), void *data = 0>
void set ()
{
set_ (0, function_thunk<function>);
set_ (data, function_thunk<function>);
}
template<void (*function)(watcher &w, int)>

95
ev.3
View File

@ -1896,12 +1896,21 @@ To use it,
\& #include <ev++.h>
.Ve
.PP
(it is not installed by default). This automatically includes \fIev.h\fR
and puts all of its definitions (many of them macros) into the global
namespace. All \*(C+ specific things are put into the \f(CW\*(C`ev\*(C'\fR namespace.
This automatically includes \fIev.h\fR and puts all of its definitions (many
of them macros) into the global namespace. All \*(C+ specific things are
put into the \f(CW\*(C`ev\*(C'\fR namespace. It should support all the same embedding
options as \fIev.h\fR, most notably \f(CW\*(C`EV_MULTIPLICITY\*(C'\fR.
.PP
It should support all the same embedding options as \fIev.h\fR, most notably
\&\f(CW\*(C`EV_MULTIPLICITY\*(C'\fR.
Care has been taken to keep the overhead low. The only data member added
to the C\-style watchers is the event loop the watcher is associated with
(or no additional members at all if you disable \f(CW\*(C`EV_MULTIPLICITY\*(C'\fR when
embedding libev).
.PP
Currently, functions and static and non-static member functions can be
used as callbacks. Other types should be easy to add as long as they only
need one additional pointer for context. If you need support for other
types of functors please contact the author (preferably after implementing
it).
.PP
Here is a list of things available in the \f(CW\*(C`ev\*(C'\fR namespace:
.ie n .IP """ev::READ""\fR, \f(CW""ev::WRITE"" etc." 4
@ -1923,21 +1932,61 @@ defines by many implementations.
.Sp
All of those classes have these methods:
.RS 4
.IP "ev::TYPE::TYPE (object *, object::method *)" 4
.IX Item "ev::TYPE::TYPE (object *, object::method *)"
.IP "ev::TYPE::TYPE ()" 4
.IX Item "ev::TYPE::TYPE ()"
.PD 0
.IP "ev::TYPE::TYPE (object *, object::method *, struct ev_loop *)" 4
.IX Item "ev::TYPE::TYPE (object *, object::method *, struct ev_loop *)"
.IP "ev::TYPE::TYPE (struct ev_loop *)" 4
.IX Item "ev::TYPE::TYPE (struct ev_loop *)"
.IP "ev::TYPE::~TYPE" 4
.IX Item "ev::TYPE::~TYPE"
.PD
The constructor takes a pointer to an object and a method pointer to
the event handler callback to call in this class. The constructor calls
\&\f(CW\*(C`ev_init\*(C'\fR for you, which means you have to call the \f(CW\*(C`set\*(C'\fR method
before starting it. If you do not specify a loop then the constructor
automatically associates the default loop with this watcher.
The constructor (optionally) takes an event loop to associate the watcher
with. If it is omitted, it will use \f(CW\*(C`EV_DEFAULT\*(C'\fR.
.Sp
The constructor calls \f(CW\*(C`ev_init\*(C'\fR for you, which means you have to call the
\&\f(CW\*(C`set\*(C'\fR method before starting it.
.Sp
It will not set a callback, however: You have to call the templated \f(CW\*(C`set\*(C'\fR
method to set a callback before you can start the watcher.
.Sp
(The reason why you have to use a method is a limitation in \*(C+ which does
not allow explicit template arguments for constructors).
.Sp
The destructor automatically stops the watcher if it is active.
.IP "w\->set<class, &class::method> (object *)" 4
.IX Item "w->set<class, &class::method> (object *)"
This method sets the callback method to call. The method has to have a
signature of \f(CW\*(C`void (*)(ev_TYPE &, int)\*(C'\fR, it receives the watcher as
first argument and the \f(CW\*(C`revents\*(C'\fR as second. The object must be given as
parameter and is stored in the \f(CW\*(C`data\*(C'\fR member of the watcher.
.Sp
This method synthesizes efficient thunking code to call your method from
the C callback that libev requires. If your compiler can inline your
callback (i.e. it is visible to it at the place of the \f(CW\*(C`set\*(C'\fR call and
your compiler is good :), then the method will be fully inlined into the
thunking function, making it as fast as a direct C callback.
.Sp
Example: simple class declaration and watcher initialisation
.Sp
.Vb 4
\& struct myclass
\& {
\& void io_cb (ev::io &w, int revents) { }
\& }
.Ve
.Sp
.Vb 3
\& myclass obj;
\& ev::io iow;
\& iow.set <myclass, &myclass::io_cb> (&obj);
.Ve
.IP "w\->set (void (*function)(watcher &w, int), void *data = 0)" 4
.IX Item "w->set (void (*function)(watcher &w, int), void *data = 0)"
Also sets a callback, but uses a static method or plain function as
callback. The optional \f(CW\*(C`data\*(C'\fR argument will be stored in the watcher's
\&\f(CW\*(C`data\*(C'\fR member and is free for you to use.
.Sp
See the method\-\f(CW\*(C`set\*(C'\fR above for more details.
.IP "w\->set (struct ev_loop *)" 4
.IX Item "w->set (struct ev_loop *)"
Associates a different \f(CW\*(C`struct ev_loop\*(C'\fR with this watcher. You can only
@ -1945,12 +1994,13 @@ do this when the watcher is inactive (and not pending either).
.IP "w\->set ([args])" 4
.IX Item "w->set ([args])"
Basically the same as \f(CW\*(C`ev_TYPE_set\*(C'\fR, with the same args. Must be
called at least once. Unlike the C counterpart, an active watcher gets
automatically stopped and restarted.
called at least once. Unlike the C counterpart, an active watcher gets
automatically stopped and restarted when reconfiguring it with this
method.
.IP "w\->start ()" 4
.IX Item "w->start ()"
Starts the watcher. Note that there is no \f(CW\*(C`loop\*(C'\fR argument as the
constructor already takes the loop.
Starts the watcher. Note that there is no \f(CW\*(C`loop\*(C'\fR argument, as the
constructor already stores the event loop.
.IP "w\->stop ()" 4
.IX Item "w->stop ()"
Stops the watcher if it is active. Again, no \f(CW\*(C`loop\*(C'\fR argument.
@ -1986,11 +2036,14 @@ the constructor.
\& }
.Ve
.PP
.Vb 6
.Vb 4
\& myclass::myclass (int fd)
\& : io (this, &myclass::io_cb),
\& idle (this, &myclass::idle_cb)
\& {
\& io .set <myclass, &myclass::io_cb > (this);
\& idle.set <myclass, &myclass::idle_cb> (this);
.Ve
.PP
.Vb 2
\& io.start (fd, ev::READ);
\& }
.Ve

81
ev.html
View File

@ -6,7 +6,7 @@
<meta name="description" content="Pod documentation for libev" />
<meta name="inputfile" content="&lt;standard input&gt;" />
<meta name="outputfile" content="&lt;standard output&gt;" />
<meta name="created" content="Fri Dec 7 20:23:46 2007" />
<meta name="created" content="Fri Dec 7 21:13:07 2007" />
<meta name="generator" content="Pod::Xhtml 1.57" />
<link rel="stylesheet" href="http://res.tst.eu/pod.css"/></head>
<body>
@ -1738,11 +1738,19 @@ the callback model to a model using method callbacks on objects.</p>
<pre> #include &lt;ev++.h&gt;
</pre>
<p>(it is not installed by default). This automatically includes <cite>ev.h</cite>
and puts all of its definitions (many of them macros) into the global
namespace. All C++ specific things are put into the <code>ev</code> namespace.</p>
<p>It should support all the same embedding options as <cite>ev.h</cite>, most notably
<code>EV_MULTIPLICITY</code>.</p>
<p>This automatically includes <cite>ev.h</cite> and puts all of its definitions (many
of them macros) into the global namespace. All C++ specific things are
put into the <code>ev</code> namespace. It should support all the same embedding
options as <cite>ev.h</cite>, most notably <code>EV_MULTIPLICITY</code>.</p>
<p>Care has been taken to keep the overhead low. The only data member added
to the C-style watchers is the event loop the watcher is associated with
(or no additional members at all if you disable <code>EV_MULTIPLICITY</code> when
embedding libev).</p>
<p>Currently, functions and static and non-static member functions can be
used as callbacks. Other types should be easy to add as long as they only
need one additional pointer for context. If you need support for other
types of functors please contact the author (preferably after implementing
it).</p>
<p>Here is a list of things available in the <code>ev</code> namespace:</p>
<dl>
<dt><code>ev::READ</code>, <code>ev::WRITE</code> etc.</dt>
@ -1763,17 +1771,50 @@ defines by many implementations.</p>
<p>All of those classes have these methods:</p>
<p>
<dl>
<dt>ev::TYPE::TYPE (object *, object::method *)</dt>
<dt>ev::TYPE::TYPE (object *, object::method *, struct ev_loop *)</dt>
<dt>ev::TYPE::TYPE ()</dt>
<dt>ev::TYPE::TYPE (struct ev_loop *)</dt>
<dt>ev::TYPE::~TYPE</dt>
<dd>
<p>The constructor takes a pointer to an object and a method pointer to
the event handler callback to call in this class. The constructor calls
<code>ev_init</code> for you, which means you have to call the <code>set</code> method
before starting it. If you do not specify a loop then the constructor
automatically associates the default loop with this watcher.</p>
<p>The constructor (optionally) takes an event loop to associate the watcher
with. If it is omitted, it will use <code>EV_DEFAULT</code>.</p>
<p>The constructor calls <code>ev_init</code> for you, which means you have to call the
<code>set</code> method before starting it.</p>
<p>It will not set a callback, however: You have to call the templated <code>set</code>
method to set a callback before you can start the watcher.</p>
<p>(The reason why you have to use a method is a limitation in C++ which does
not allow explicit template arguments for constructors).</p>
<p>The destructor automatically stops the watcher if it is active.</p>
</dd>
<dt>w-&gt;set&lt;class, &amp;class::method&gt; (object *)</dt>
<dd>
<p>This method sets the callback method to call. The method has to have a
signature of <code>void (*)(ev_TYPE &amp;, int)</code>, it receives the watcher as
first argument and the <code>revents</code> as second. The object must be given as
parameter and is stored in the <code>data</code> member of the watcher.</p>
<p>This method synthesizes efficient thunking code to call your method from
the C callback that libev requires. If your compiler can inline your
callback (i.e. it is visible to it at the place of the <code>set</code> call and
your compiler is good :), then the method will be fully inlined into the
thunking function, making it as fast as a direct C callback.</p>
<p>Example: simple class declaration and watcher initialisation</p>
<pre> struct myclass
{
void io_cb (ev::io &amp;w, int revents) { }
}
myclass obj;
ev::io iow;
iow.set &lt;myclass, &amp;myclass::io_cb&gt; (&amp;obj);
</pre>
</dd>
<dt>w-&gt;set (void (*function)(watcher &amp;w, int), void *data = 0)</dt>
<dd>
<p>Also sets a callback, but uses a static method or plain function as
callback. The optional <code>data</code> argument will be stored in the watcher's
<code>data</code> member and is free for you to use.</p>
<p>See the method-<code>set</code> above for more details.</p>
</dd>
<dt>w-&gt;set (struct ev_loop *)</dt>
<dd>
<p>Associates a different <code>struct ev_loop</code> with this watcher. You can only
@ -1782,13 +1823,14 @@ do this when the watcher is inactive (and not pending either).</p>
<dt>w-&gt;set ([args])</dt>
<dd>
<p>Basically the same as <code>ev_TYPE_set</code>, with the same args. Must be
called at least once. Unlike the C counterpart, an active watcher gets
automatically stopped and restarted.</p>
called at least once. Unlike the C counterpart, an active watcher gets
automatically stopped and restarted when reconfiguring it with this
method.</p>
</dd>
<dt>w-&gt;start ()</dt>
<dd>
<p>Starts the watcher. Note that there is no <code>loop</code> argument as the
constructor already takes the loop.</p>
<p>Starts the watcher. Note that there is no <code>loop</code> argument, as the
constructor already stores the event loop.</p>
</dd>
<dt>w-&gt;stop ()</dt>
<dd>
@ -1822,9 +1864,10 @@ the constructor.</p>
}
myclass::myclass (int fd)
: io (this, &amp;myclass::io_cb),
idle (this, &amp;myclass::idle_cb)
{
io .set &lt;myclass, &amp;myclass::io_cb &gt; (this);
idle.set &lt;myclass, &amp;myclass::idle_cb&gt; (this);
io.start (fd, ev::READ);
}

85
ev.pod
View File

@ -1746,12 +1746,21 @@ To use it,
#include <ev++.h>
(it is not installed by default). This automatically includes F<ev.h>
and puts all of its definitions (many of them macros) into the global
namespace. All C++ specific things are put into the C<ev> namespace.
This automatically includes F<ev.h> and puts all of its definitions (many
of them macros) into the global namespace. All C++ specific things are
put into the C<ev> namespace. It should support all the same embedding
options as F<ev.h>, most notably C<EV_MULTIPLICITY>.
It should support all the same embedding options as F<ev.h>, most notably
C<EV_MULTIPLICITY>.
Care has been taken to keep the overhead low. The only data member added
to the C-style watchers is the event loop the watcher is associated with
(or no additional members at all if you disable C<EV_MULTIPLICITY> when
embedding libev).
Currently, functions and static and non-static member functions can be
used as callbacks. Other types should be easy to add as long as they only
need one additional pointer for context. If you need support for other
types of functors please contact the author (preferably after implementing
it).
Here is a list of things available in the C<ev> namespace:
@ -1777,20 +1786,58 @@ All of those classes have these methods:
=over 4
=item ev::TYPE::TYPE (object *, object::method *)
=item ev::TYPE::TYPE ()
=item ev::TYPE::TYPE (object *, object::method *, struct ev_loop *)
=item ev::TYPE::TYPE (struct ev_loop *)
=item ev::TYPE::~TYPE
The constructor takes a pointer to an object and a method pointer to
the event handler callback to call in this class. The constructor calls
C<ev_init> for you, which means you have to call the C<set> method
before starting it. If you do not specify a loop then the constructor
automatically associates the default loop with this watcher.
The constructor (optionally) takes an event loop to associate the watcher
with. If it is omitted, it will use C<EV_DEFAULT>.
The constructor calls C<ev_init> for you, which means you have to call the
C<set> method before starting it.
It will not set a callback, however: You have to call the templated C<set>
method to set a callback before you can start the watcher.
(The reason why you have to use a method is a limitation in C++ which does
not allow explicit template arguments for constructors).
The destructor automatically stops the watcher if it is active.
=item w->set<class, &class::method> (object *)
This method sets the callback method to call. The method has to have a
signature of C<void (*)(ev_TYPE &, int)>, it receives the watcher as
first argument and the C<revents> as second. The object must be given as
parameter and is stored in the C<data> member of the watcher.
This method synthesizes efficient thunking code to call your method from
the C callback that libev requires. If your compiler can inline your
callback (i.e. it is visible to it at the place of the C<set> call and
your compiler is good :), then the method will be fully inlined into the
thunking function, making it as fast as a direct C callback.
Example: simple class declaration and watcher initialisation
struct myclass
{
void io_cb (ev::io &w, int revents) { }
}
myclass obj;
ev::io iow;
iow.set <myclass, &myclass::io_cb> (&obj);
=item w->set (void (*function)(watcher &w, int), void *data = 0)
Also sets a callback, but uses a static method or plain function as
callback. The optional C<data> argument will be stored in the watcher's
C<data> member and is free for you to use.
See the method-C<set> above for more details.
=item w->set (struct ev_loop *)
Associates a different C<struct ev_loop> with this watcher. You can only
@ -1799,13 +1846,14 @@ do this when the watcher is inactive (and not pending either).
=item w->set ([args])
Basically the same as C<ev_TYPE_set>, with the same args. Must be
called at least once. Unlike the C counterpart, an active watcher gets
automatically stopped and restarted.
called at least once. Unlike the C counterpart, an active watcher gets
automatically stopped and restarted when reconfiguring it with this
method.
=item w->start ()
Starts the watcher. Note that there is no C<loop> argument as the
constructor already takes the loop.
Starts the watcher. Note that there is no C<loop> argument, as the
constructor already stores the event loop.
=item w->stop ()
@ -1840,9 +1888,10 @@ the constructor.
}
myclass::myclass (int fd)
: io (this, &myclass::io_cb),
idle (this, &myclass::idle_cb)
{
io .set <myclass, &myclass::io_cb > (this);
idle.set <myclass, &myclass::idle_cb> (this);
io.start (fd, ev::READ);
}