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85 lines
4.1 KiB
HTML
85 lines
4.1 KiB
HTML
4 years ago
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<title>Creating and Freeing a Hash Table - Untitled</title>
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<meta name="description" content="Untitled">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Hash-Tables.html#Hash-Tables" title="Hash Tables">
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<link rel="prev" href="Hash-Tables.html#Hash-Tables" title="Hash Tables">
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<link rel="next" href="Looking-Up-or-Entering-a-String.html#Looking-Up-or-Entering-a-String" title="Looking Up or Entering a String">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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This file documents the BFD library.
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Copyright (C) 1991-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being ``GNU General Public License'' and ``Funding
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Free Software'', the Front-Cover texts being (a) (see below), and with
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the Back-Cover Texts being (b) (see below). A copy of the license is
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included in the section entitled ``GNU Free Documentation License''.
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development.-->
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</head>
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<body>
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<div class="node">
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<a name="Creating-and-Freeing-a-Hash-Table"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Looking-Up-or-Entering-a-String.html#Looking-Up-or-Entering-a-String">Looking Up or Entering a String</a>,
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Previous: <a rel="previous" accesskey="p" href="Hash-Tables.html#Hash-Tables">Hash Tables</a>,
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Up: <a rel="up" accesskey="u" href="Hash-Tables.html#Hash-Tables">Hash Tables</a>
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<hr>
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</div>
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<h4 class="subsection">2.18.1 Creating and freeing a hash table</h4>
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<p><a name="index-bfd_005fhash_005ftable_005finit-2356"></a><a name="index-bfd_005fhash_005ftable_005finit_005fn-2357"></a>To create a hash table, create an instance of a <code>struct
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bfd_hash_table</code> (defined in <code>bfd.h</code>) and call
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<code>bfd_hash_table_init</code> (if you know approximately how many
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entries you will need, the function <code>bfd_hash_table_init_n</code>,
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which takes a <var>size</var> argument, may be used).
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<code>bfd_hash_table_init</code> returns <code>FALSE</code> if some sort of
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error occurs.
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<p><a name="index-bfd_005fhash_005fnewfunc-2358"></a>The function <code>bfd_hash_table_init</code> take as an argument a
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function to use to create new entries. For a basic hash
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table, use the function <code>bfd_hash_newfunc</code>. See <a href="Deriving-a-New-Hash-Table-Type.html#Deriving-a-New-Hash-Table-Type">Deriving a New Hash Table Type</a>, for why you would want to use a
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different value for this argument.
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<p><a name="index-bfd_005fhash_005fallocate-2359"></a><code>bfd_hash_table_init</code> will create an objalloc which will be
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used to allocate new entries. You may allocate memory on this
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objalloc using <code>bfd_hash_allocate</code>.
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<p><a name="index-bfd_005fhash_005ftable_005ffree-2360"></a>Use <code>bfd_hash_table_free</code> to free up all the memory that has
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been allocated for a hash table. This will not free up the
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<code>struct bfd_hash_table</code> itself, which you must provide.
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<p><a name="index-bfd_005fhash_005fset_005fdefault_005fsize-2361"></a>Use <code>bfd_hash_set_default_size</code> to set the default size of
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hash table to use.
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</body></html>
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