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- Subject: Query about gettable tag methods.
- From: "Paul Winwood"<Paul_Winwood@...>
- Date: Thu, 10 May 2001 14:52:05 GMT
I am using Lua 4.0.
I have some userdata implemented in 'C' that has a "gettable" tag method on it.
One of the data items in the user data can be either a data
access where a value is pushed onto the Lua stack via lua_pushnumber,
or a function access (which pushes a 'C' or Lua function on the Lua stack via
To illustrate this please consider the following Lua code fragment:
local dataitem = userdata.Add
where the gettable tag method is called to return a data object using index
local dataitem = userdata:Add()
where the gettable tag method is called to return a function object. The
function object index is 'Add'
I would like data access to occur when using the '.' syntax and a function
access to occur
when using the ':' syntax (the current Lua opcode being executed is either
OP_GETDOTTED or OP_PUSHSELF).
In each case the gettable tag method is called with the userdata and the index
name as parameters.
The tag method is written in 'C'.
My question is this: is there any way to determine from the tag method whether
the data object or the
function object should be returned from the tag method. I am unable to change
the name of the
index to eliminate the ambiguity. I have considered adding a suffix or prefix to
the index name to
eliminate the ambiguity but would rather not as it seems too big a hack to me.