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115 lines
5.2 KiB
HTML
115 lines
5.2 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the BFD library.
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Copyright (C) 1991-2019 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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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Creating and Freeing a Hash Table (Untitled Document)</title>
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<meta name="description" content="Creating and Freeing a Hash Table (Untitled Document)">
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<meta name="keywords" content="Creating and Freeing a Hash Table (Untitled Document)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="BFD-Index.html#BFD-Index" rel="index" title="BFD Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Hash-Tables.html#Hash-Tables" rel="up" title="Hash Tables">
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<link href="Looking-Up-or-Entering-a-String.html#Looking-Up-or-Entering-a-String" rel="next" title="Looking Up or Entering a String">
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<link href="Hash-Tables.html#Hash-Tables" rel="prev" title="Hash Tables">
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<style type="text/css">
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Creating-and-Freeing-a-Hash-Table"></a>
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<div class="header">
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<p>
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Next: <a href="Looking-Up-or-Entering-a-String.html#Looking-Up-or-Entering-a-String" accesskey="n" rel="next">Looking Up or Entering a String</a>, Previous: <a href="Hash-Tables.html#Hash-Tables" accesskey="p" rel="prev">Hash Tables</a>, Up: <a href="Hash-Tables.html#Hash-Tables" accesskey="u" rel="up">Hash Tables</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="BFD-Index.html#BFD-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Creating-and-freeing-a-hash-table"></a>
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<h4 class="subsection">2.18.1 Creating and freeing a hash table</h4>
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<a name="index-bfd_005fhash_005ftable_005finit"></a>
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<a name="index-bfd_005fhash_005ftable_005finit_005fn"></a>
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<p>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>
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<a name="index-bfd_005fhash_005fnewfunc"></a>
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<p>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>
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<a name="index-bfd_005fhash_005fallocate"></a>
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<p><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>
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<a name="index-bfd_005fhash_005ftable_005ffree"></a>
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<p>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>
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<a name="index-bfd_005fhash_005fset_005fdefault_005fsize"></a>
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<p>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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</p>
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</body>
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</html>
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