Re: newbie - try catch - array of struct - gc - loop terminated

[Adrian Sietsma <adrian_groups@...>]

Diego - Red Baires wrote:
> Hi everyone, my name is Diego and i am a newbie trying to
> learn LUA. the following are some questions because i couldnt
> f¡nd information about it. could you help me pls ?
>
> 1) does LUA accept some kind of try/catch structures ? any example ?

you could use pcall (it's in the manual) : I use it to invoke user-supplied 
"callback" routines.

> 2) will GC free this NIL assignments ?
>
> t = {}
> i = 10;
> t[1] = "diego";
> t[2] = "martin";
>
> -- do something...
>
> t = nil;
> i = nil;
> collectgarbage("collect")
Yes

> 3) is there a way to create an array of a structured type ? something 
> like this
>
> mytype = struct {
>   s : string;
>   i : int;
> }
>
> var myarray : mytype;
>
> myarray [1].s = "diego";
> myarray [1].i = 10;
> myarray [2].s = "martin";
> myarray [2].i = 2;
There are many OO frameworks around for Lua involving metatables, but as the 
simplest case :

local myarray = {}
myarray[1] = {s="diego",i=10}
myarray[2] = {s="martin",i=2}



> 4) suppose this scenario: i run a LUA script inside a process.
> the process receives a finish-application message.
> does it exists any "terminated" flag to know this "terminating process"
>
> i mean, how do i have to do to exit an infinit loop ?
>
> while not(lua.terminating)
>   -- do loop
> end

I'll leave that for someone else.

Adrian