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optional<T>
===========
This is an implemention of `optional from the standard library`_. If it detects that a proper optional exists, it will attempt to use it. This is mostly an implementation detail, used in the :ref:`sol::stack::check_get<stack-check-get>` and :ref:`sol::stack::get\<optional\<T>><stack-get>` and ``sol::optional<T> maybe_value = table["arf"];`` implementations for additional safety reasons.
See `this example here`_ for a demonstration on how to use it and other features!
.. _optional from the standard library: http://en.cppreference.com/w/cpp/utility/optional
.. _this example here: https://github.com/ThePhD/sol2/blob/develop/examples/source/optional_with_iteration.cpp
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