25 lines
1.4 KiB
ReStructuredText
25 lines
1.4 KiB
ReStructuredText
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as_function
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===========
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*make sure an object is pushed as a function*
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.. code-block:: cpp
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template <typename Sig = sol::function_sig<>, typename... Args>
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function_argumants<Sig, Args...> as_function ( Args&& ... );
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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.
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This class can also make it so usertypes bind variable types as functions to for usertype bindings.
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.. literalinclude:: ../../../examples/source/docs/as_function.cpp
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:linenos:
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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.
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Here's an example of binding a variable as a function to a usertype:
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.. literalinclude:: ../../../examples/source/docs/as_function_usertype_member_variable.cpp
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:linenos:
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