as_function

make sure an object is pushed as a function

.. code-block:: cpp

template <typename Sig = sol::function_sig<>, typename... Args>
function_argumants<Sig, Args...> as_function ( Args&& ... );

This function serves the purpose of ensuring that a callable struct (like a lambda) can be passed to the set( key, value ) calls on :ref:sol::table<set-value> and be treated like a function binding instead of a userdata. It is recommended that one uses the :ref:sol::table::set_function<set-function> call instead, but if for some reason one must use set, then as_function can help ensure a callable struct is handled like a lambda / callable, and not as just a userdata structure.

This class can also make it so usertypes bind variable types as functions to for usertype bindings.

.. literalinclude:: ../../../examples/source/docs/as_function.cpp :linenos:

Note that if you actually want a userdata, but you want it to be callable, you simply need to create a :ref:sol::table::new_usertype<new-usertype> and then bind the "__call" metamethod (or just use sol::meta_function::call :ref:enumeration<meta_function_enum>). This may or may not be done automatically for you, depending on whether or not the call operator is overloaded and such.

Here's an example of binding a variable as a function to a usertype:

.. literalinclude:: ../../../examples/source/docs/as_function_usertype_member_variable.cpp :linenos: