📄 symopen.htm
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<title>symOpen -- basic</title>
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<td class=title-left><b> symOpen</b></td>
<td class=title-center><b> basic</b></td>
<td class=title-right><B> EMF</B></td>
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<h2>Synopsis</h2>
<p>Creates a symbol table for fast indexing</p>
<h2>Prototype</h2>
<pre>
sym_fd_t <b>symOpen</b>(int hash_size);
</pre>
<h2>Parameters</h2>
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<td width=40>hash_size</td>
<td>Table size. Nearest prime number is actually used.</td>
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<h2>Description</h2>
<p>
This module implements a highly efficient generic symbol table with
update and access routines. Symbols are simple character strings and
the values they take can be flexible types as defined by value_t.
This module allows multiple symbol tables to be created.
</p>
<p>
The function allocates a table structure (sym_tabent_t) which consists of
the table size, a flag for whether the table is in use, and the actual table
itself. The structure is stored in a global sym array that can be accessed by
the returned sym_fd_t handle.
</p>
<h2>Return Value</h2>
<p>
Returns an integer (sym_fd_t) to be used as the handle for subsequent calls to
the symbol table access functions. Returns -1 on error.
</p>
<h2>Example</h2>
<pre>
sym_fd_t id;
sym_t* sp;
id = symOpen(64);
...
symEnter(id, "lookup", valueString("value"), 0);
...
sp = symLookup(id, "lookup");
</pre>
<h2>See Also</h2>
<p>
<a href="symClose.htm">symClose</a>,
<a href="symDelete.htm">symDelete</a>,
<a href="symEnter.htm">symEnter</a>,
<a href="symFirst.htm">symFirst</a>,
<a href="symLookup.htm">symLookup</a>,
<a href="symNext.htm">symNext</a>
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