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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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Copyright (C) 2001 Information-technology Promotion Agency (IPA)
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<html><head><meta http-equiv="Content-Type" content="text/html;charset="UTF-8">
<title>The m17n Library</title>
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<h1>Managed Object<br>
<small>
[<a class="el" href="group__m17nCore.html">CORE API</a>]</small>
</h1>Managed objects are objects managed by the reference count.
<a href="#_details">More...</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Data Structures</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">struct </td><td class="memItemRight" valign="bottom"><a class="el" href="structM17NObjectHead.html">M17NObjectHead</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">The first member of a managed object. <a href="structM17NObjectHead.html#_details">More...</a><br></td></tr>
<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__m17nObject.html#ga0">m17n_object</a> (int size, void(*freer)(void *))</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Allocate a managed object. <a href="#ga0"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__m17nObject.html#ga1">m17n_object_ref</a> (void *object)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Increment the reference count of a managed object. <a href="#ga1"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__m17nObject.html#ga2">m17n_object_unref</a> (void *object)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Decrement the reference count of a managed object. <a href="#ga2"></a><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
There are some types of m17n objects that are managed by their reference count. Those objects are called <em>managed</em> <em>objects</em>. When created, the reference count of a managed object is initialized to one. The <a class="el" href="group__m17nObject.html#ga1">m17n_object_ref()</a> function increments the reference count of a managed object by one, and the <a class="el" href="group__m17nObject.html#ga2">m17n_object_unref()</a> function decrements by one. A managed object is automatically freed when its reference count becomes zero.<p>
A property whose key is a managing key can have only a managed object as its value. Such functions as <a class="el" href="group__m17nSymbol.html#ga9">msymbol_put()</a> and <a class="el" href="group__m17nPlist.html#ga7">mplist_put()</a> pay special attention to such a property.<p>
In addition to the predefined managed object types, users can define their own managed object types. See the documentation of the <a class="el" href="group__m17nObject.html#ga0">m17n_object()</a> for more details. <hr><h2>Function Documentation</h2>
<a class="anchor" name="ga0" doxytag="m17n-core.c::m17n_object"></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
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<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top">void* m17n_object </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">int </td>
<td class="mdname" nowrap> <em>size</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>void(*)(void *) </td>
<td class="mdname" nowrap> <em>freer</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
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</td>
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<p>
The <a class="el" href="group__m17nObject.html#ga0">m17n_object()</a> function allocates a new managed object of <b>size</b> bytes and sets its reference count to 1. <b>freer</b> is the function that is used to free the object when the reference count becomes 0. If <b>freer</b> is NULL, the object is freed by the free() function.<p>
The heading bytes of the allocated object is occupied by <a class="el" href="structM17NObjectHead.html">M17NObjectHead</a>. That area is reserved for the m17n library and application programs should never touch it.<p>
<dl compact><dt><b>Return value:</b></dt><dd>This function returns a newly allocated object.</dd></dl>
<dl compact><dt><b>Errors:</b></dt><dd>This function never fails.</dd></dl>
<dl compact><dt><b>Example:</b></dt><dd><div class="fragment"><pre class="fragment"><span class="keyword">typedef</span> <span class="keyword">struct</span>
<span class="keyword"></span>{
<a class="code" href="structM17NObjectHead.html">M17NObjectHead</a> head;
<span class="keywordtype">int</span> mem1;
<span class="keywordtype">char</span> *mem2;
} MYStruct;
<span class="keywordtype">void</span>
my_freer (<span class="keywordtype">void</span> *obj)
{
free (((MYStruct *) obj)->mem2);
free (obj);
}
<span class="keywordtype">void</span>
my_func (MText *mt, MSymbol key, <span class="keywordtype">int</span> num, <span class="keywordtype">char</span> *str)
{
MYStruct *st = <a class="code" href="group__m17nObject.html#ga0">m17n_object</a> (<span class="keyword">sizeof</span> (MYStruct), my_freer);
st->mem1 = num;
st->mem2 = strdup (str);
<span class="comment">// KEY must be a managing key. </span>
<a class="code" href="group__m17nTextProperty.html#ga8">mtext_put_prop</a> (mt, 0, mtext_len (mt), key, st);
<span class="comment">// This sets the reference count of ST back to 1. </span>
<a class="code" href="group__m17nObject.html#ga2">m17n_object_unref</a> (st);
}
</pre></div></dd></dl>
</td>
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<a class="anchor" name="ga1" doxytag="m17n-core.c::m17n_object_ref"></a><p>
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<td class="md" nowrap valign="top">int m17n_object_ref </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">void * </td>
<td class="mdname1" valign="top" nowrap> <em>object</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
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</td>
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<td>
<p>
The <a class="el" href="group__m17nObject.html#ga1">m17n_object_ref()</a> function increments the reference count of the managed object pointed to by <b>object</b>.<p>
<dl compact><dt><b>Return value:</b></dt><dd>This function returns the resulting reference count if it fits in a 16-bit unsigned integer (i.e. less than 0x10000). Otherwise, it return -1.</dd></dl>
<dl compact><dt><b>Errors:</b></dt><dd>This function never fails. </dd></dl>
</td>
</tr>
</table>
<a class="anchor" name="ga2" doxytag="m17n-core.c::m17n_object_unref"></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top">int m17n_object_unref </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">void * </td>
<td class="mdname1" valign="top" nowrap> <em>object</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
The <a class="el" href="group__m17nObject.html#ga2">m17n_object_unref()</a> function decrements the reference count of the managed object pointed to by <b>object</b>. When the reference count becomes zero, the object is freed by its freer function.<p>
<dl compact><dt><b>Return value:</b></dt><dd>This function returns the resulting reference count if it fits in a 16-bit unsigned integer (i.e. less than 0x10000). Otherwise, it returns -1. Thus, the return value zero means that <b>object</b> is freed.</dd></dl>
<dl compact><dt><b>Errors:</b></dt><dd>This function never fails. </dd></dl>
</td>
</tr>
</table>
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