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The "template_depth" pragma provides a hard limit for the amount of nested
template expansions allowed so that infinite expansion can be detected.

The form of the "template_depth" pragma is as follows.

+--------------------------------------------------------------------------+
|      #pragma template_depth [(] n [)] [;]                                |
|                                                                          |
+--------------------------------------------------------------------------+

where
    description

n
    is the depth of expansion.  If the value of n is less than 2, if will
    default to 2.  If n is not specified, a warning message will be issued
    and the default value for n will be 100.

The following example of recursive template expansion illustrates why this
pragma can be useful.

Example:

     #pragma template_depth(10);

     template <class T>
     struct S {
         S<T*> x;
     };

     S<char> v;