1&nbsp;&nbsp;&nbsp;Template Keywords</h4>
<p>The first step is to define keywords for each template parameter:</p>
<pre class="literal-block">
namespace boost { namespace python {

BOOST_PARAMETER_TEMPLATE_KEYWORD(class_type)
BOOST_PARAMETER_TEMPLATE_KEYWORD(base_list)
BOOST_PARAMETER_TEMPLATE_KEYWORD(held_type)
BOOST_PARAMETER_TEMPLATE_KEYWORD(copyable)

}}
</pre>
<!-- @example.prepend('#include <boost/parameter.hpp>') -->
<!-- @test('compile') -->
<p>The declaration of the <tt class="docutils literal">cla