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<a name="Write-Other-Derived-Routines"></a>Previous: <a rel="previous" accesskey="p" href="Write-the-Derived-Creation-Routine.html#Write-the-Derived-Creation-Routine">Write the Derived Creation Routine</a>,
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Up: <a rel="up" accesskey="u" href="Deriving-a-New-Hash-Table-Type.html#Deriving-a-New-Hash-Table-Type">Deriving a New Hash Table Type</a>
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<h5 class="subsubsection">2.18.4.3 Write other derived routines</h5>
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<p>You will want to write other routines for your new hash table,
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as well.
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<p>You will want an initialization routine which calls the
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initialization routine of the hash table you are deriving from
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and initializes any other local fields. For the linker hash
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table, this is <code>_bfd_link_hash_table_init</code> in <code>linker.c</code>.
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<p>You will want a lookup routine which calls the lookup routine
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of the hash table you are deriving from and casts the result.
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The linker hash table uses <code>bfd_link_hash_lookup</code> in
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<code>linker.c</code> (this actually takes an additional argument which
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it uses to decide how to return the looked up value).
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<p>You may want a traversal routine. This should just call the
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traversal routine of the hash table you are deriving from with
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appropriate casts. The linker hash table uses
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<code>bfd_link_hash_traverse</code> in <code>linker.c</code>.
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<p>These routines may simply be defined as macros. For example,
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the a.out backend linker hash table, which is derived from the
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linker hash table, uses macros for the lookup and traversal
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routines. These are <code>aout_link_hash_lookup</code> and
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<code>aout_link_hash_traverse</code> in aoutx.h.
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