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<a name="Define-the-Derived-Structures"></a>Next: <a rel="next" accesskey="n" href="Write-the-Derived-Creation-Routine.html#Write-the-Derived-Creation-Routine">Write the Derived Creation Routine</a>,
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Previous: <a rel="previous" accesskey="p" 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">2.18.4.1 Define the derived structures</h5>
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<p>You must define a structure for an entry in the hash table,
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and a structure for the hash table itself.
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<p>The first field in the structure for an entry in the hash
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table must be of the type used for an entry in the hash table
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you are deriving from. If you are deriving from a basic hash
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table this is <code>struct bfd_hash_entry</code>, which is defined in
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<code>bfd.h</code>. The first field in the structure for the hash
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table itself must be of the type of the hash table you are
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deriving from itself. If you are deriving from a basic hash
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table, this is <code>struct bfd_hash_table</code>.
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<p>For example, the linker hash table defines <code>struct
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bfd_link_hash_entry</code> (in <code>bfdlink.h</code>). The first field,
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<code>root</code>, is of type <code>struct bfd_hash_entry</code>. Similarly,
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the first field in <code>struct bfd_link_hash_table</code>, <code>table</code>,
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is of type <code>struct bfd_hash_table</code>.
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