检查功能是否在C或Lua中实现

Question

I've created a table and assigned a method with lua_pushcfunction named mytable:myfunction() . In a different (callback) context it's necessarily that myfunction will be overriden inside the Lua script. For some reasons, if i call myfunction from the C host, I need to know, if myfunction is still the c function or was replaced by the script.

Is there a way to test (from C), if the C method is still attached or is replaced by some Lua code ?

Answer 1

是的，你可以使用lua_iscfunction 。

Answer 2

Another possibility is to use lua_tocfunction . This allows you to also check if the C function you got back is the one you expect.