About make_function definition in make_function.hpp

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Hi guys, I have an question in reading luabind code. At the bottom of file
make_function.hpp is the definitions of two function:

template <class F, class Signature, class Policies>
object make_function(lua_State* L, F f, Signature, Policies)
{
typedef typename detail::as_vector<Signature>::type signature;

return detail::make_function_aux(
    L
  , new detail::function_object_impl&lt;F, signature, Policies&gt;(
        f, Policies()
    )
);

}

template <class F>
object make_function(lua_State* L, F f)
{
return make_function(L, detail::deduce_signature(f), detail::null_type());
}

In the statement make_function(L, detail::deduce_signature(f),
detail::null_type()) which only provide three args, but the above
make_function need four args. Why?

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<div dir=3D"ltr"><p style=3D"font-size:14px">Hi guys, I have an question in=
 reading luabind code. At the bottom of file make_function.hpp is the defin=
itions of two function:</p><p style=3D"font-size:14px"><font face=3D"arial,=
 helvetica, sans-serif">template &lt;class F, class Signature, class Polici=
es&gt;<br>object make_function(lua_State* L, F f, Signature, Policies)<br>{=
<br>typedef typename detail::as_vector&lt;Signature&gt;::type signature;</f=
ont></p><div style=3D"font-size:14px"><pre style=3D"white-space:pre-wrap"><=
font face=3D"arial, helvetica, sans-serif">return detail::make_function_aux=
(
    L
  , new detail::function_object_impl&amp;lt;F, signature, Policies&amp;gt;(
        f, Policies()
    )
);
</font></pre></div><p style=3D"font-size:14px"><font face=3D"arial, helveti=
ca, sans-serif">}</font></p><p style=3D"font-size:14px"><font face=3D"arial=
, helvetica, sans-serif">template &lt;class F&gt;<br>object make_function(l=
ua_State* L, F f)<br>{<br>return make_function(L, detail::deduce_signature(=
f), detail::null_type());<br>}</font></p><p style=3D"font-size:14px">In the=
 statement make_function(L, detail::deduce_signature(f), detail::null_type(=
)) which only provide three args, but the above make_function need four arg=
s. Why?</p></div>

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