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19 lines
1.3 KiB
ReStructuredText
19 lines
1.3 KiB
ReStructuredText
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light<T>/user<T>
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================
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Utility class for the cheapest form of (light) userdata
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-------------------------------------------------------
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.. code-block:: cpp
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template <typename T>
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struct user;
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template <typename T>
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struct light;
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``sol::user<T>`` and ``sol::light<T>`` are two utility classes that do not participate in the full :doc:`sol::usertype\<T><usertype>` system. The goal of these classes is to provide the most minimal memory footprint and overhead for putting a single item and getting a single item out of Lua. ``sol::user<T>``, when pushed into Lua, will create a thin, unnamed metatable for that instance specifically which will be for calling its destructor. ``sol::light<T>`` specifically pushes a reference / pointer into Lua as a ``sol::type::lightuserdata``.
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If you feel that you do not need to have something participate in the full :doc:`usertype\<T><usertype>` system, use the utility functions ``sol::make_user( ... )`` and ``sol::make_light( ... )`` to create these types and store them into Lua. You can get them off the Lua stack / out of the Lua system by using the same retrieval techniques on ``get`` and ``operator[]`` on tables and with stack operations.
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Both have implicit conversion operators to ``T*`` and ``T&``, so you can set them immediately to their respective pointer and reference types if you need them.
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