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2015-02-11 5:59 GMT+02:00 张睿 <>:
> Section 4.5 of Lua 5.3 document says:
>         The registry table is always located at pseudo-index LUA_REGISTRYINDEX, which is a valid index.
> Is it correct?

Saying that LUA_REGISTRYINDEX is a pseudo-index means
that most API functions that requires an index into the stack
will work with a pseudo-index too, e.g.


A few functions must not be used with a pseudo-index.
Each such case is documented specifically, e.g. lua_insert.