s data.  A const iterator has read-only access to the vector
elements.  T_constIterator is a public type declared by Vector&lt;T_numtype&gt;,
and should be used to specify the type of the iterator:
<pre>
Vector&lt;int&gt; z(50,0,1);       // Creates the vector [ 0 1 2 ... 49 ]
const Vector&lt;int&gt;& zref = z; // Create a const reference to z
Vector&lt;int&gt;::T_constIterator iter = zref.begin();
</pre>
Since T_constIterator is STL-compliant, it may be used with the
standard template library routines.  [G