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30 lines
1.6 KiB
ReStructuredText
30 lines
1.6 KiB
ReStructuredText
c_call
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======
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*templated type to transport functions through templates*
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.. code-block:: cpp
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template <typename Function, Function f>
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int c_call (lua_State* L);
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template <typename... Functions>
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int c_call (lua_State* L);
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The goal of ``sol::c_call<...>`` is to provide a way to wrap a function and transport it through a compile-time context. This enables faster speed at the cost of a much harder to read / poorer interface, and can alleviate some template compilation speed issues. ``sol::c_call`` expects a type for its first template argument, and a value of the previously provided type for the second template argument. To make a compile-time transported overloaded function, specify multiple functions in the same ``type, value`` pairing, but put it inside of a ``sol::wrap``.
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.. note::
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This can also be placed into the argument list for a :doc:`usertype<usertype>` as well.
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This pushes a raw ``lua_CFunction`` into whatever you pass the resulting ``c_call`` function pointer into, whether it be a table or a userdata or whatever else using sol3's API. The resulting ``lua_CFunction`` can also be used directly with the lua API, just like many of sol3's types can be intermingled with Lua's API if you know what you're doing.
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It is advisable for the user to consider making a macro to do the necessary ``decltype( &function_name, ), function_name``. Sol does not provide one because many codebases already have `one similar to this`_.
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Here's an example below of various ways to use ``sol::c_call``:
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.. literalinclude:: ../../../examples/source/c_call.cpp
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:linenos:
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.. _one similar to this: http://stackoverflow.com/a/5628222/5280922
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