stant convertible to bool of unspecified
                  type
                </p></dd>
</dl>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="function_invocation_and_creation.boost_python_ptr_hpp.metafunctions.class_template_unwrap_pointer"></a><a class="link" href="boost_python_ptr_hpp.html#function_invocation_and_creation.boost_python_ptr_hpp.metafunctions.class_template_unwrap_pointer" title="Class template unwrap_pointer">Class
          template <code 