href=
    "http://www.python.org/doc/current/ref/identifiers.html">identifier
    naming rules</a>. If <code>docstring</code> is supplied, it must be an
    <a href="definitions.html#ntbs">ntbs</a>. If <code>init_spec</code> is
    supplied, it must be either the special enumeration constant
    <code>no_init</code> or an <a href=
    "init.html#init-expressions">init-expression</a> compatible with
    <code>T</code>.</dt>

    <dt><b>Effects:</b> Constructs a <code>class_</code> object holding a
    Boost.