Re: Lua 5.1+ and variable-argument tables

[Mark Hamburg <mhamburg@...>]

I rather like that as a way of dealing with the magic name "arg".

It also simplifies some other things like writing cleanup wrappers using
pcall. For example one can then have:

    function Mutex:do( func )
        -- Execute func with locked mutex. Returns results of
        -- executing func.
        self:lock()
        local success, result, others[] = pcall( func )
        self:unlock()
        if not success then error( result ) end
        return result, others[]
    end

Too bad it creates extra heap allocations.

This snippet also points to a moderately interesting idiom with respect to
pcall that isn't entirely easy or at least efficient to implement today.

Mark

on 8/20/04 2:43 PM, Edgar Toernig at froese@gmx.de wrote:

> Hehe, iirc I once suggested:
> 
>  a, b, c[] = f()           -- pack into c
> 
>  function foo(a, b, c[])   -- define vararg function
> 
>  foo(1, 2, c[])            -- unpack c