>%immutable</tt> and <tt>%mutable</tt> directives can be used to
specify a collection of read-only variables.  For example:

<blockquote>
<pre>
%immutable;
int    status;
double blah;
...
%mutable;
</pre>
</blockquote>

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

<h2>Comments</h2>
<ul>
<li>Management of global variables is one of the most problematic aspects 
of C/C++ wrapping because the scripting interface and resulting memory