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+ <meta name="created" content="Sat Nov 24 10:48:32 2007" />
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<p>Unlike <code>ev_timer</code>'s, they are not based on real time (or relative time)
but on wallclock time (absolute time). You can tell a periodic watcher
to trigger "at" some specific point in time. For example, if you tell a
-periodic watcher to trigger in 10 seconds (by specifiying e.g. c<ev_now ()
-+ 10.>) and then reset your system clock to the last year, then it will
+periodic watcher to trigger in 10 seconds (by specifiying e.g. <code>ev_now ()
++ 10.</code>) and then reset your system clock to the last year, then it will
take a year to trigger the event (unlike an <code>ev_timer</code>, which would trigger
roughly 10 seconds later and of course not if you reset your system time
again).</p>
</div>
<h1 id="C_SUPPORT">C++ SUPPORT</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="C_SUPPORT_CONTENT">
-<p>TBD.</p>
+<p>Libev comes with some simplistic wrapper classes for C++ that mainly allow
+you to use some convinience methods to start/stop watchers and also change
+the callback model to a model using method callbacks on objects.</p>
+<p>To use it,</p>
+<pre> #include <ev++.h>
+
+</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>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>
+ <dd>
+ <p>These are just enum values with the same values as the <code>EV_READ</code> etc.
+macros from <cite>ev.h</cite>.</p>
+ </dd>
+ <dt><code>ev::tstamp</code>, <code>ev::now</code></dt>
+ <dd>
+ <p>Aliases to the same types/functions as with the <code>ev_</code> prefix.</p>
+ </dd>
+ <dt><code>ev::io</code>, <code>ev::timer</code>, <code>ev::periodic</code>, <code>ev::idle</code>, <code>ev::sig</code> etc.</dt>
+ <dd>
+ <p>For each <code>ev_TYPE</code> watcher in <cite>ev.h</cite> there is a corresponding class of
+the same name in the <code>ev</code> namespace, with the exception of <code>ev_signal</code>
+which is called <code>ev::sig</code> to avoid clashes with the <code>signal</code> macro
+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>
+ <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 destructor automatically stops the watcher if it is active.</p>
+ </dd>
+ <dt>w->set (struct ev_loop *)</dt>
+ <dd>
+ <p>Associates a different <code>struct ev_loop</code> with this watcher. You can only
+do this when the watcher is inactive (and not pending either).</p>
+ </dd>
+ <dt>w->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>
+ </dd>
+ <dt>w->start ()</dt>
+ <dd>
+ <p>Starts the watcher. Note that there is no <code>loop</code> argument as the
+constructor already takes the loop.</p>
+ </dd>
+ <dt>w->stop ()</dt>
+ <dd>
+ <p>Stops the watcher if it is active. Again, no <code>loop</code> argument.</p>
+ </dd>
+ <dt>w->again () <code>ev::timer</code>, <code>ev::periodic</code> only</dt>
+ <dd>
+ <p>For <code>ev::timer</code> and <code>ev::periodic</code>, this invokes the corresponding
+<code>ev_TYPE_again</code> function.</p>
+ </dd>
+ <dt>w->sweep () <code>ev::embed</code> only</dt>
+ <dd>
+ <p>Invokes <code>ev_embed_sweep</code>.</p>
+ </dd>
+ </dl>
+ </p>
+ </dd>
+</dl>
+<p>Example: Define a class with an IO and idle watcher, start one of them in
+the constructor.</p>
+<pre> class myclass
+ {
+ ev_io io; void io_cb (ev::io &w, int revents);
+ ev_idle idle void idle_cb (ev::idle &w, int revents);
+
+ myclass ();
+ }
+
+ myclass::myclass (int fd)
+ : io (this, &myclass::io_cb),
+ idle (this, &myclass::idle_cb)
+ {
+ io.start (fd, ev::READ);
+ }
+
+</pre>
</div>
<h1 id="AUTHOR">AUTHOR</h1><p><a href="#TOP" class="toplink">Top</a></p>
projects / software / libev.git / blobdiff