CODEWITHSUNDEEP
delphilua
Samoongeer
Samoongeer

Reputation: 51

Getting arg to work in a varag function in Lua 5.2 (integrated in Delphi)

When using the Lua 5.2 API, the code below prints "nil"

function __debug(szName, ...)
    print(type(arg));
end

__debug("s", 1, 2, 3, 4);

But this code does work when using Lua 5.1, and prints "table"

Upvotes: 4

Views: 2586

Answers (2)

Michal Kottman
Michal Kottman

Reputation: 16753

If you are referring to vararg function, the arg table was deprecated already in Lua 5.1. In Lua 5.2, you can use table.pack to create arg if you need it:

function debug(name, ...)
    local arg = table.pack(...)
    print(name)
    for i=1,arg.n do
        print(i, arg[i])
    end
end

Upvotes: 11

jpjacobs
jpjacobs

Reputation: 9549

That's because arg has been deprecated since Lua 5.1. It only remained as a compatibility feature.

References: Lua 5.1 manual, unofficial LuaFaq

a workaround is using this line to generate a table called arg:

local arg={...}

Upvotes: 3

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