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<h2><span class="refentrytitle"><a name="libgwyddion-gwymacros.top_of_page"></a>gwymacros</span></h2>
<p>gwymacros — Utility macros</p>
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<td valign="top" align="right"></td>
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<div class="refsynopsisdiv">
<a name="libgwyddion-gwymacros.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <libgwyddion/gwyddion.h>
#define <a class="link" href="libgwyddion-gwymacros.html#GWY-CLAMP:CAPS" title="GWY_CLAMP()">GWY_CLAMP</a> (x,
low,
hi)
#define <a class="link" href="libgwyddion-gwymacros.html#GWY-FIND-PSPEC:CAPS" title="GWY_FIND_PSPEC()">GWY_FIND_PSPEC</a> (type,
id,
spectype)
#define <a class="link" href="libgwyddion-gwymacros.html#GWY-SWAP:CAPS" title="GWY_SWAP()">GWY_SWAP</a> (t,
x,
y)
#define <a class="link" href="libgwyddion-gwymacros.html#N-:CAPS" title="N_()">N_</a> (x)
#define <a class="link" href="libgwyddion-gwymacros.html#gettext-macro" title="_()">_</a> (x)
#define <a class="link" href="libgwyddion-gwymacros.html#gettext" title="gettext()">gettext</a> (x)
#define <a class="link" href="libgwyddion-gwymacros.html#gwy-clear" title="gwy_clear()">gwy_clear</a> (array,
n)
#define <a class="link" href="libgwyddion-gwymacros.html#gwy-debug" title="gwy_debug()">gwy_debug</a> (...)
<span class="returnvalue">void</span> <a class="link" href="libgwyddion-gwymacros.html#gwy-debug-gnu" title="gwy_debug_gnu ()">gwy_debug_gnu</a> (<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *domain</code></em>,
<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *fileline</code></em>,
<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *funcname</code></em>,
<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *format</code></em>,
<em class="parameter"><code>...</code></em>);
#define <a class="link" href="libgwyddion-gwymacros.html#gwy-object-unref" title="gwy_object_unref()">gwy_object_unref</a> (obj)
#define <a class="link" href="libgwyddion-gwymacros.html#gwy-signal-handler-disconnect" title="gwy_signal_handler_disconnect()">gwy_signal_handler_disconnect</a> (obj,
hid)
#define <a class="link" href="libgwyddion-gwymacros.html#gwy-strequal" title="gwy_strequal()">gwy_strequal</a> (a,
b)
#define <a class="link" href="libgwyddion-gwymacros.html#ngettext" title="ngettext()">ngettext</a> (sing,
plur,
n)
</pre>
</div>
<div class="refsect1">
<a name="libgwyddion-gwymacros.description"></a><h2>Description</h2>
</div>
<div class="refsect1">
<a name="libgwyddion-gwymacros.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GWY-CLAMP:CAPS"></a><h3>GWY_CLAMP()</h3>
<pre class="programlisting">#define GWY_CLAMP(x, low, hi)</pre>
<p>
Ensures that <em class="parameter"><code>x</code></em> is between the limits set by <em class="parameter"><code>low</code></em> and <em class="parameter"><code>hi</code></em>.
</p>
<p>
This macro differs from GLib's <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Standard-Macros.html#CLAMP:CAPS"><code class="function">CLAMP()</code></a> by <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Miscellaneous-Macros.html#G-UNLIKELY:CAPS"><code class="function">G_UNLIKELY()</code></a> assertions on the
tests that <em class="parameter"><code>x</code></em> is smaller than <em class="parameter"><code>low</code></em> and larger than <em class="parameter"><code>hi</code></em>. This makes <em class="parameter"><code>x</code></em>
already being in the right range the fast code path.
</p>
<p>
It is supposed to be used on results of floating-point operations that
should fall to a known range but may occasionaly fail to due to rounding
errors and in similar situations. Under normal circumstances, use <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Standard-Macros.html#CLAMP:CAPS"><code class="function">CLAMP()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>The value to clamp.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>low</code></em> :</span></p></td>
<td>The minimum value allowed.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hi</code></em> :</span></p></td>
<td>The maximum value allowed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GWY-FIND-PSPEC:CAPS"></a><h3>GWY_FIND_PSPEC()</h3>
<pre class="programlisting">#define GWY_FIND_PSPEC(type, id, spectype)</pre>
<p>
A convenience <a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#g-object-class-find-property"><code class="function">g_object_class_find_property()</code></a> wrapper.
</p>
<p>
It expands to property spec cast to correct type (<em class="parameter"><code>spec</code></em>).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>Object type (e.g. <code class="literal">GWY_TYPE_CONTAINER</code>).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>id</code></em> :</span></p></td>
<td>Property id.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>spectype</code></em> :</span></p></td>
<td>Param spec type (e.g. <code class="literal">DOUBLE</code>).</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GWY-SWAP:CAPS"></a><h3>GWY_SWAP()</h3>
<pre class="programlisting">#define GWY_SWAP(t, x, y)</pre>
<p>
Swaps two variables (more precisely lhs and rhs expressions) of type <em class="parameter"><code>t</code></em>
in a single statement.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>t</code></em> :</span></p></td>
<td>A C type.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>A variable of type <em class="parameter"><code>t</code></em> to swap with <em class="parameter"><code>x</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>A variable of type <em class="parameter"><code>t</code></em> to swap with <em class="parameter"><code>y</code></em>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="N-:CAPS"></a><h3>N_()</h3>
<pre class="programlisting">#define N_(x) gettext_noop(x)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="gettext-macro"></a><h3>_()</h3>
<pre class="programlisting">#define _(x) gettext(x)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="gettext"></a><h3>gettext()</h3>
<pre class="programlisting">#define gettext(x) (x)
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-clear"></a><h3>gwy_clear()</h3>
<pre class="programlisting">#define gwy_clear(array, n)</pre>
<p>
Fills memory block representing an array with zeroes.
</p>
<p>
This is a shorthand for memset, with the number of bytes to fill calculated
from the type of the pointer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>array</code></em> :</span></p></td>
<td>Pointer to an array of values to clear.
This argument may be evaluated several times.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>n</code></em> :</span></p></td>
<td>Number of items to clear.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.12</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-debug"></a><h3>gwy_debug()</h3>
<pre class="programlisting">#define gwy_debug(format...)</pre>
<p>
Prints a debugging message.
</p>
<p>
Does nothing if compiled without DEBUG defined.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>...</code></em> :</span></p></td>
<td>A format string followed by stuff to print.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-debug-gnu"></a><h3>gwy_debug_gnu ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_debug_gnu (<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *domain</code></em>,
<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *fileline</code></em>,
<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *funcname</code></em>,
<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *format</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>
Print a debugging message.
</p>
<p>
To be used via <a class="link" href="libgwyddion-gwymacros.html#gwy-debug" title="gwy_debug()"><code class="function">gwy_debug()</code></a>, should not be used directly.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>domain</code></em> :</span></p></td>
<td>Log domain.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>fileline</code></em> :</span></p></td>
<td>File and line info.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>funcname</code></em> :</span></p></td>
<td>Function name.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>Message format.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>...</code></em> :</span></p></td>
<td>Message parameters.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-object-unref"></a><h3>gwy_object_unref()</h3>
<pre class="programlisting">#define gwy_object_unref(obj)</pre>
<p>
Unreferences an object if it exists.
</p>
<p>
If <em class="parameter"><code>obj</code></em> is not <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, <a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#g-object-unref"><code class="function">g_object_unref()</code></a> is called on it.
In all cases <em class="parameter"><code>obj</code></em> is set to <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.
</p>
<p>
A useful property of this macro is its idempotence.
</p>
<p>
If the object reference count is greater than one, assure it should be
referenced elsewhere, otherwise it leaks memory.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>A pointer to <a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> (must be an l-value).</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-signal-handler-disconnect"></a><h3>gwy_signal_handler_disconnect()</h3>
<pre class="programlisting">#define gwy_signal_handler_disconnect(obj, hid)</pre>
<p>
Disconnect a signal handler if it exists.
</p>
<p>
If <em class="parameter"><code>hid</code></em> is nonzero and <em class="parameter"><code>obj</code></em> is not <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, the signal handler identified by
<em class="parameter"><code>hid</code></em> is disconnected. In all cases <em class="parameter"><code>hid</code></em> is set to 0.
</p>
<p>
A useful property of this macro is its idempotence.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>A pointer to <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hid</code></em> :</span></p></td>
<td>An <em class="parameter"><code>obj</code></em> signal handler id or 0 (must be an l-value).</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-strequal"></a><h3>gwy_strequal()</h3>
<pre class="programlisting">#define gwy_strequal(a, b)</pre>
<p>
Expands to <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if strings are equal, to <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> otherwise.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>a</code></em> :</span></p></td>
<td>A string.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>b</code></em> :</span></p></td>
<td>Another string.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="ngettext"></a><h3>ngettext()</h3>
<pre class="programlisting">#define ngettext(sing, plur, n) ((n) == 1 ? (sing) : (plur))
</pre>
<p>
</p>
</div>
</div>
<div class="refsect1">
<a name="libgwyddion-gwymacros.see-also"></a><h2>See Also</h2>
<a class="link" href="libgwyddion-gwyutils.html" title="gwyutils">gwyutils</a> -- utility
functions
</div>
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