Specifying function argument names in lua

Question

I load the body of a function from a string (with C api), but by default, all arguments passed to the function are accessed with .... What is the best way to specify an argument list? I can only think of prepending a line like the following to the string before parsing it (assume the arguments should be self, x, y):

local self, x, y = ...

However, I'm not sure if its the best way to do this, or whether it has any unintended side effects.

Update: in one of the functions, I need an argument list of the form self, type, .... The following wouldn't work, right?

local self, type, ... = ...

Should I use this instead?

text = "return function(self, type, ...)" + text + " end";
luaL_loadbufferx(L, text, text.length(), filename, "t");
lua_call(L, 0, 1);

Your last solution is good. Just note that you need to call lua_call twice to run your code. — lhf
– lhf, Commented Apr 5, 2013 at 21:39
Yes, after the fragment I posted I grab the function from the stack and store it for later use. First solution has no lua_call. — riv
– riv, Commented Apr 5, 2013 at 22:53

lhf · Accepted Answer · 2013-04-05 21:00:21Z

3

Prepending that line is an excellent way to create named arguments. If you use a local declaration as you have, then there won't be any side effects (except the ones from the rest of the code).

answered Apr 5, 2013 at 21:00

lhf

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2 Comments

riv Over a year ago

Okay, great, though if for some reason my arguments needs to be (self, ...) - I can't do that, right?

bazola Over a year ago

You can eliminate the (self) from the arguments by using this: function Thing:functionName() (the :() is the same as saying self)

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