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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Type Conversion Macros: GLib Reference Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="GLib Reference Manual"> <link rel="up" href="glib-fundamentals.html" title="GLib Fundamentals"> <link rel="prev" href="glib-Standard-Macros.html" title="Standard Macros"> <link rel="next" href="glib-Byte-Order-Macros.html" title="Byte Order Macros"> <meta name="generator" content="GTK-Doc V1.32 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> <td width="100%" align="left" class="shortcuts"> <a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> <a href="#glib-Type-Conversion-Macros.description" class="shortcut">Description</a></span> </td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="glib-fundamentals.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="glib-Standard-Macros.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="glib-Byte-Order-Macros.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="refentry"> <a name="glib-Type-Conversion-Macros"></a><div class="titlepage"></div> <div class="refnamediv"><table width="100%"><tr> <td valign="top"> <h2><span class="refentrytitle"><a name="glib-Type-Conversion-Macros.top_of_page"></a>Type Conversion Macros</span></h2> <p>Type Conversion Macros — portably storing integers in pointer variables</p> </td> <td class="gallery_image" valign="top" align="right"></td> </tr></table></div> <div class="refsect1"> <a name="glib-Type-Conversion-Macros.functions"></a><h2>Functions</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="functions_proto_type"> <col class="functions_proto_name"> </colgroup> <tbody> <tr> <td class="define_keyword">#define</td> <td class="function_name"> <a class="link" href="glib-Type-Conversion-Macros.html#GINT-TO-POINTER:CAPS" title="GINT_TO_POINTER()">GINT_TO_POINTER</a><span class="c_punctuation">()</span> </td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"> <a class="link" href="glib-Type-Conversion-Macros.html#GPOINTER-TO-INT:CAPS" title="GPOINTER_TO_INT()">GPOINTER_TO_INT</a><span class="c_punctuation">()</span> </td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"> <a class="link" href="glib-Type-Conversion-Macros.html#GUINT-TO-POINTER:CAPS" title="GUINT_TO_POINTER()">GUINT_TO_POINTER</a><span class="c_punctuation">()</span> </td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"> <a class="link" href="glib-Type-Conversion-Macros.html#GPOINTER-TO-UINT:CAPS" title="GPOINTER_TO_UINT()">GPOINTER_TO_UINT</a><span class="c_punctuation">()</span> </td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"> <a class="link" href="glib-Type-Conversion-Macros.html#GSIZE-TO-POINTER:CAPS" title="GSIZE_TO_POINTER()">GSIZE_TO_POINTER</a><span class="c_punctuation">()</span> </td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"> <a class="link" href="glib-Type-Conversion-Macros.html#GPOINTER-TO-SIZE:CAPS" title="GPOINTER_TO_SIZE()">GPOINTER_TO_SIZE</a><span class="c_punctuation">()</span> </td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="glib-Type-Conversion-Macros.includes"></a><h2>Includes</h2> <pre class="synopsis">#include <glib.h> </pre> </div> <div class="refsect1"> <a name="glib-Type-Conversion-Macros.description"></a><h2>Description</h2> <p>Many times GLib, GTK+, and other libraries allow you to pass "user data" to a callback, in the form of a void pointer. From time to time you want to pass an integer instead of a pointer. You could allocate an integer, with something like:</p> <div class="informalexample"> <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> <tbody> <tr> <td class="listing_lines" align="right"><pre>1 2</pre></td> <td class="listing_code"><pre class="programlisting"><span class="kt">int</span> <span class="o">*</span><span class="n">ip</span> <span class="o">=</span> <span class="n">g_new</span> <span class="p">(</span><span class="kt">int</span><span class="p">,</span> <span class="mi">1</span><span class="p">);</span> <span class="o">*</span><span class="n">ip</span> <span class="o">=</span> <span class="mi">42</span><span class="p">;</span></pre></td> </tr> </tbody> </table> </div> <p> But this is inconvenient, and it's annoying to have to free the memory at some later time.</p> <p>Pointers are always at least 32 bits in size (on all platforms GLib intends to support). Thus you can store at least 32-bit integer values in a pointer value. Naively, you might try this, but it's incorrect:</p> <div class="informalexample"> <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> <tbody> <tr> <td class="listing_lines" align="right"><pre>1 2 3 4</pre></td> <td class="listing_code"><pre class="programlisting"><span class="n">gpointer</span> <span class="n">p</span><span class="p">;</span> <span class="kt">int</span> <span class="n">i</span><span class="p">;</span> <span class="n">p</span> <span class="o">=</span> <span class="p">(</span><span class="kt">void</span><span class="o">*</span><span class="p">)</span> <span class="mi">42</span><span class="p">;</span> <span class="n">i</span> <span class="o">=</span> <span class="p">(</span><span class="kt">int</span><span class="p">)</span> <span class="n">p</span><span class="p">;</span></pre></td> </tr> </tbody> </table> </div> <p> Again, that example was not correct, don't copy it. The problem is that on some systems you need to do this:</p> <div class="informalexample"> <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> <tbody> <tr> <td class="listing_lines" align="right"><pre>1 2 3 4</pre></td> <td class="listing_code"><pre class="programlisting"><span class="n">gpointer</span> <span class="n">p</span><span class="p">;</span> <span class="kt">int</span> <span class="n">i</span><span class="p">;</span> <span class="n">p</span> <span class="o">=</span> <span class="p">(</span><span class="kt">void</span><span class="o">*</span><span class="p">)</span> <span class="p">(</span><span class="kt">long</span><span class="p">)</span> <span class="mi">42</span><span class="p">;</span> <span class="n">i</span> <span class="o">=</span> <span class="p">(</span><span class="kt">int</span><span class="p">)</span> <span class="p">(</span><span class="kt">long</span><span class="p">)</span> <span class="n">p</span><span class="p">;</span></pre></td> </tr> </tbody> </table> </div> <p> The GLib macros <a class="link" href="glib-Type-Conversion-Macros.html#GPOINTER-TO-INT:CAPS" title="GPOINTER_TO_INT()"><code class="function">GPOINTER_TO_INT()</code></a>, <a class="link" href="glib-Type-Conversion-Macros.html#GINT-TO-POINTER:CAPS" title="GINT_TO_POINTER()"><code class="function">GINT_TO_POINTER()</code></a>, etc. take care to do the right thing on every platform.</p> <p>Warning: You may not store pointers in integers. This is not portable in any way, shape or form. These macros only allow storing integers in pointers, and only preserve 32 bits of the integer; values outside the range of a 32-bit integer will be mangled.</p> </div> <div class="refsect1"> <a name="glib-Type-Conversion-Macros.functions_details"></a><h2>Functions</h2> <div class="refsect2"> <a name="GINT-TO-POINTER:CAPS"></a><h3>GINT_TO_POINTER()</h3> <pre class="programlisting">#define GINT_TO_POINTER(i) ((gpointer) (glong) (i)) </pre> <p>Stuffs an integer into a pointer type.</p> <p>Remember, you may not store pointers in integers. This is not portable in any way, shape or form. These macros only allow storing integers in pointers, and only preserve 32 bits of the integer; values outside the range of a 32-bit integer will be mangled.</p> <div class="refsect3"> <a name="GINT-TO-POINTER.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>i</p></td> <td class="parameter_description"><p>integer to stuff into a pointer</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> </div> <hr> <div class="refsect2"> <a name="GPOINTER-TO-INT:CAPS"></a><h3>GPOINTER_TO_INT()</h3> <pre class="programlisting">#define GPOINTER_TO_INT(p) ((gint) (glong) (p)) </pre> <p>Extracts an integer from a pointer. The integer must have been stored in the pointer with <a class="link" href="glib-Type-Conversion-Macros.html#GINT-TO-POINTER:CAPS" title="GINT_TO_POINTER()"><code class="function">GINT_TO_POINTER()</code></a>.</p> <p>Remember, you may not store pointers in integers. This is not portable in any way, shape or form. These macros only allow storing integers in pointers, and only preserve 32 bits of the integer; values outside the range of a 32-bit integer will be mangled.</p> <div class="refsect3"> <a name="GPOINTER-TO-INT.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>p</p></td> <td class="parameter_description"><p>pointer containing an integer</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> </div> <hr> <div class="refsect2"> <a name="GUINT-TO-POINTER:CAPS"></a><h3>GUINT_TO_POINTER()</h3> <pre class="programlisting">#define GUINT_TO_POINTER(u) ((gpointer) (gulong) (u)) </pre> <p>Stuffs an unsigned integer into a pointer type.</p> <div class="refsect3"> <a name="GUINT-TO-POINTER.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>u</p></td> <td class="parameter_description"><p>unsigned integer to stuff into the pointer</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> </div> <hr> <div class="refsect2"> <a name="GPOINTER-TO-UINT:CAPS"></a><h3>GPOINTER_TO_UINT()</h3> <pre class="programlisting">#define GPOINTER_TO_UINT(p) ((guint) (gulong) (p)) </pre> <p>Extracts an unsigned integer from a pointer. The integer must have been stored in the pointer with <a class="link" href="glib-Type-Conversion-Macros.html#GUINT-TO-POINTER:CAPS" title="GUINT_TO_POINTER()"><code class="function">GUINT_TO_POINTER()</code></a>.</p> <div class="refsect3"> <a name="GPOINTER-TO-UINT.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>p</p></td> <td class="parameter_description"><p>pointer to extract an unsigned integer from</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> </div> <hr> <div class="refsect2"> <a name="GSIZE-TO-POINTER:CAPS"></a><h3>GSIZE_TO_POINTER()</h3> <pre class="programlisting">#define GSIZE_TO_POINTER(s) ((gpointer) (gsize) (s)) </pre> <p>Stuffs a <a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> into a pointer type.</p> <div class="refsect3"> <a name="GSIZE-TO-POINTER.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>s</p></td> <td class="parameter_description"><p><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> to stuff into the pointer</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> </div> <hr> <div class="refsect2"> <a name="GPOINTER-TO-SIZE:CAPS"></a><h3>GPOINTER_TO_SIZE()</h3> <pre class="programlisting">#define GPOINTER_TO_SIZE(p) ((gsize) (p)) </pre> <p>Extracts a <a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> from a pointer. The <a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> must have been stored in the pointer with <a class="link" href="glib-Type-Conversion-Macros.html#GSIZE-TO-POINTER:CAPS" title="GSIZE_TO_POINTER()"><code class="function">GSIZE_TO_POINTER()</code></a>.</p> <div class="refsect3"> <a name="GPOINTER-TO-SIZE.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>p</p></td> <td class="parameter_description"><p>pointer to extract a <a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> from</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> </div> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>