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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<a href="#id2563336" class="shortcut">Description</a></nobr></td></tr>
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<a name="cairo-Types"></a><div class="titlepage"></div>
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<h2>
<a name="id2539930"></a><span class="refentrytitle">Types</span>
</h2>
<p>Types — Generic data types used in the cairo API</p>
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<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<pre class="synopsis">
typedef <a href="cairo-Types.html#cairo-bool-t">cairo_bool_t</a>;
<a href="cairo-Types.html#cairo-user-data-key-t">cairo_user_data_key_t</a>;
void (<a href="cairo-Types.html#cairo-destroy-func-t">*cairo_destroy_func_t</a>) (void *data);
</pre>
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<div class="refsect1" lang="en">
<a name="id2563336"></a><h2>Description</h2>
<p>
</p>
</div>
<div class="refsect1" lang="en">
<a name="id2606884"></a><h2>Details</h2>
<div class="refsect2" lang="en">
<a name="id2606894"></a><h3>
<a name="cairo-bool-t"></a>cairo_bool_t</h3>
<a class="indexterm" name="id2606905"></a><pre class="programlisting">typedef int cairo_bool_t;
</pre>
<p>
<a href="cairo-Types.html#cairo-bool-t"><span class="type">cairo_bool_t</span></a> is used for boolean values. Returns of type
<a href="cairo-Types.html#cairo-bool-t"><span class="type">cairo_bool_t</span></a> will always be either 0 or 1, but testing against
these values explicitly is not encouraged; just use the
value as a boolean condition.
</p>
<p>
</p>
<div class="informalexample"><pre class="programlisting">
if (cairo_in_stroke (cr, x, y)) {
/* do something */
}
</pre></div>
<p>
</p>
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<hr>
<div class="refsect2" lang="en">
<a name="id2606954"></a><h3>
<a name="cairo-user-data-key-t"></a>cairo_user_data_key_t</h3>
<a class="indexterm" name="id2606965"></a><pre class="programlisting">typedef struct {
int unused;
} cairo_user_data_key_t;
</pre>
<p>
<a href="cairo-Types.html#cairo-user-data-key-t"><span class="type">cairo_user_data_key_t</span></a> is used for attaching user data to cairo
data structures. The actual contents of the struct is never used,
and there is no need to initialize the object; only the unique
address of a <span class="type">cairo_data_key_t</span> object is used. Typically, you
would just use the address of a static <span class="type">cairo_data_key_t</span> object.</p>
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</p>
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<td>
<span class="term">int <em class="structfield"><code>unused</code></em>;</span></td>
<td> not used; ignore.
</td>
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<hr>
<div class="refsect2" lang="en">
<a name="id2610973"></a><h3>
<a name="cairo-destroy-func-t"></a>cairo_destroy_func_t ()</h3>
<a class="indexterm" name="id2610984"></a><pre class="programlisting">void (*cairo_destroy_func_t) (void *data);</pre>
<p>
<a href="cairo-Types.html#cairo-destroy-func-t"><span class="type">cairo_destroy_func_t</span></a> the type of function which is called when a
data element is destroyed. It is passed the pointer to the data
element and should free any memory and resources allocated for it.</p>
<p>
</p>
<div class="variablelist"><table border="0">
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<td>
<span class="term"><em class="parameter"><code>data</code></em> :</span></td>
<td> The data element being destroyed.
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