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| <a name="Hash-Tables-1"></a> |
| <h3 class="section">2.18 Hash Tables</h3> |
| <a name="index-Hash-tables"></a> |
| <p>BFD provides a simple set of hash table functions. Routines |
| are provided to initialize a hash table, to free a hash table, |
| to look up a string in a hash table and optionally create an |
| entry for it, and to traverse a hash table. There is |
| currently no routine to delete an string from a hash table. |
| </p> |
| <p>The basic hash table does not permit any data to be stored |
| with a string. However, a hash table is designed to present a |
| base class from which other types of hash tables may be |
| derived. These derived types may store additional information |
| with the string. Hash tables were implemented in this way, |
| rather than simply providing a data pointer in a hash table |
| entry, because they were designed for use by the linker back |
| ends. The linker may create thousands of hash table entries, |
| and the overhead of allocating private data and storing and |
| following pointers becomes noticeable. |
| </p> |
| <p>The basic hash table code is in <code>hash.c</code>. |
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| <tr><td align="left" valign="top">• <a href="Creating-and-Freeing-a-Hash-Table.html#Creating-and-Freeing-a-Hash-Table" accesskey="1">Creating and Freeing a Hash Table</a>:</td><td> </td><td align="left" valign="top"> |
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| <tr><td align="left" valign="top">• <a href="Looking-Up-or-Entering-a-String.html#Looking-Up-or-Entering-a-String" accesskey="2">Looking Up or Entering a String</a>:</td><td> </td><td align="left" valign="top"> |
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| <tr><td align="left" valign="top">• <a href="Traversing-a-Hash-Table.html#Traversing-a-Hash-Table" accesskey="3">Traversing a Hash Table</a>:</td><td> </td><td align="left" valign="top"> |
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| <tr><td align="left" valign="top">• <a href="Deriving-a-New-Hash-Table-Type.html#Deriving-a-New-Hash-Table-Type" accesskey="4">Deriving a New Hash Table Type</a>:</td><td> </td><td align="left" valign="top"> |
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