e blah;
...
%mutable;
</pre>
</blockquote>

The <tt>%immutable</tt> directive remains in effect until it is explicitly disabled
using the <tt>%mutable</tt> directive.


<h2>Notes:</h2>

<ul>
<li>When a global variable has the type "<tt>char *</tt>", SWIG manages it as a character
string.   However, whenever the value of such a variable is set from Perl, the old
value is destroyed using <tt>free()</tt> or <tt>delete</tt> (the choice of which depends
on whether or not SWIG was run with the -c++ option).
<li><