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<h2><span class="refentrytitle"><a name="GDataComparable.top_of_page"></a>GDataComparable</span></h2>
<p>GDataComparable — GData comparable interface</p>
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<div class="refsect1">
<a name="GDataComparable.stability-level"></a><h2>Stability Level</h2>
Unstable, unless otherwise indicated
</div>
<div class="refsynopsisdiv">
<a name="GDataComparable.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <gdata/gdata-comparable.h>
<a class="link" href="GDataComparable.html#GDataComparable-struct" title="GDataComparable">GDataComparable</a>;
<a class="link" href="GDataComparable.html#GDataComparableIface" title="GDataComparableIface">GDataComparableIface</a>;
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> <a class="link" href="GDataComparable.html#gdata-comparable-compare" title="gdata_comparable_compare ()">gdata_comparable_compare</a> (<em class="parameter"><code><a class="link" href="GDataComparable.html" title="GDataComparable"><span class="type">GDataComparable</span></a> *self</code></em>,
<em class="parameter"><code><a class="link" href="GDataComparable.html" title="GDataComparable"><span class="type">GDataComparable</span></a> *other</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="GDataComparable.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
GInterface
+----GDataComparable
</pre>
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<div class="refsect1">
<a name="GDataComparable.implementations"></a><h2>Known Implementations</h2>
<p>
GDataComparable is implemented by
<a class="link" href="GDataAuthor.html" title="GDataAuthor">GDataAuthor</a>, <a class="link" href="GDataCategory.html" title="GDataCategory">GDataCategory</a>, <a class="link" href="GDataGContactCalendar.html" title="GDataGContactCalendar">GDataGContactCalendar</a>, <a class="link" href="GDataGContactExternalID.html" title="GDataGContactExternalID">GDataGContactExternalID</a>, <a class="link" href="GDataGContactLanguage.html" title="GDataGContactLanguage">GDataGContactLanguage</a>, <a class="link" href="GDataGContactWebsite.html" title="GDataGContactWebsite">GDataGContactWebsite</a>, <a class="link" href="GDataGDEmailAddress.html" title="GDataGDEmailAddress">GDataGDEmailAddress</a>, <a class="link" href="GDataGDIMAddress.html" title="GDataGDIMAddress">GDataGDIMAddress</a>, <a class="link" href="GDataGDName.html" title="GDataGDName">GDataGDName</a>, <a class="link" href="GDataGDOrganization.html" title="GDataGDOrganization">GDataGDOrganization</a>, <a class="link" href="GDataGDPhoneNumber.html" title="GDataGDPhoneNumber">GDataGDPhoneNumber</a>, <a class="link" href="GDataGDPostalAddress.html" title="GDataGDPostalAddress">GDataGDPostalAddress</a>, <a class="link" href="GDataGDReminder.html" title="GDataGDReminder">GDataGDReminder</a>, <a class="link" href="GDataGDWhen.html" title="GDataGDWhen">GDataGDWhen</a>, <a class="link" href="GDataGDWhere.html" title="GDataGDWhere">GDataGDWhere</a>, <a class="link" href="GDataGDWho.html" title="GDataGDWho">GDataGDWho</a>, <a class="link" href="GDataGenerator.html" title="GDataGenerator">GDataGenerator</a>, <a class="link" href="GDataLink.html" title="GDataLink">GDataLink</a> and <a class="link" href="GDataYouTubeCategory.html" title="GDataYouTubeCategory">GDataYouTubeCategory</a>.</p>
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<div class="refsect1">
<a name="GDataComparable.description"></a><h2>Description</h2>
<p>
<a class="link" href="GDataComparable.html" title="GDataComparable"><span class="type">GDataComparable</span></a> is an interface which can be implemented by any object which needs to be compared to another object of the same type or of a
derived type.
</p>
<p>
When implementing the interface, classes must implement the <code class="function">compare_with</code> function, and the implementation must be
<a class="ulink" href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#index-g_t_0040code_007bpure_007d-function-attribute-2413" target="_top">pure
</a>.
</p>
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<div class="refsect1">
<a name="GDataComparable.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GDataComparable-struct"></a><h3>GDataComparable</h3>
<pre class="programlisting">typedef struct _GDataComparable GDataComparable;</pre>
<p>
All the fields in the <a class="link" href="GDataComparable.html" title="GDataComparable"><span class="type">GDataComparable</span></a> structure are private and should never be accessed directly.
</p>
<p class="since">Since 0.7.0</p>
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<hr>
<div class="refsect2">
<a name="GDataComparableIface"></a><h3>GDataComparableIface</h3>
<pre class="programlisting">typedef struct {
GTypeInterface parent;
gint (*compare_with) (GDataComparable *self, GDataComparable *other);
} GDataComparableIface;
</pre>
<p>
The class structure for the <a class="link" href="GDataComparable.html" title="GDataComparable"><span class="type">GDataComparable</span></a> interface.
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<td><p><span class="term"><a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GTypeInterface"><span class="type">GTypeInterface</span></a> <em class="structfield"><code><a name="GDataComparableIface.parent"></a>parent</code></em>;</span></p></td>
<td>the parent type</td>
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<td><p><span class="term"><em class="structfield"><code><a name="GDataComparableIface.compare-with"></a>compare_with</code></em> ()</span></p></td>
<td>compares the object with an <em class="parameter"><code>other</code></em> object of the same type, returning <code class="code">-1</code> if the object is "less than"
the other object, <code class="code">0</code> if they're equal, or <code class="code">1</code> if the object is "greater than" the other. The
function can assume that neither <em class="parameter"><code>self</code></em> or <em class="parameter"><code>other</code></em> will be <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, and that both have correct types. The function must be pure.</td>
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<p class="since">Since 0.7.0</p>
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<hr>
<div class="refsect2">
<a name="gdata-comparable-compare"></a><h3>gdata_comparable_compare ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> gdata_comparable_compare (<em class="parameter"><code><a class="link" href="GDataComparable.html" title="GDataComparable"><span class="type">GDataComparable</span></a> *self</code></em>,
<em class="parameter"><code><a class="link" href="GDataComparable.html" title="GDataComparable"><span class="type">GDataComparable</span></a> *other</code></em>);</pre>
<p>
Compares the two objects, returning <code class="code">-1</code> if <em class="parameter"><code>self</code></em> is "less than" <em class="parameter"><code>other</code></em> by some metric, <code class="code">0</code>
if they're equal, or <code class="code">1</code> if <em class="parameter"><code>self</code></em> is "greater than" <em class="parameter"><code>other</code></em>.
</p>
<p>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> values are handled gracefully, with <code class="code">0</code> returned if both <em class="parameter"><code>self</code></em> and <em class="parameter"><code>other</code></em> are <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>,
<code class="code">-1</code> if <em class="parameter"><code>self</code></em> is <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> and <code class="code">1</code> if <em class="parameter"><code>other</code></em> is <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.
</p>
<p>
The <em class="parameter"><code>other</code></em> object must be of the same type as <em class="parameter"><code>self</code></em>, or of a type derived from <em class="parameter"><code>self</code></em>'s type.
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<td><p><span class="term"><em class="parameter"><code>self</code></em> :</span></p></td>
<td>a <a class="link" href="GDataComparable.html" title="GDataComparable"><span class="type">GDataComparable</span></a>, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
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<td><p><span class="term"><em class="parameter"><code>other</code></em> :</span></p></td>
<td>another <a class="link" href="GDataComparable.html" title="GDataComparable"><span class="type">GDataComparable</span></a> of the same type, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> on success, <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> otherwise</td>
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<p class="since">Since 0.7.0</p>
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