[DGD]mappings, use of.

[balduin at uni-paderborn.de]

> Yeah Im afraid its me again.  I need something cleared up.
> According to an LPC tutorial I have you can get the
> value of a mapping by doing the following:
> mapping test;
> 
> test=(["smile":"$N $vsmile.", "grin":"$N $vgrin.");
Well this line contains a typo. It must read:
test=(["smile":"$N $vsmile.", "grin":"$N $vgrin."]);
                                                 ^
where test is either declared as mapping or mixed.
> 
> Now according to their examples I should be able to get
> "$N $vsmile." by doing the following:
> test["smile"];
> Or if I had a string called "command" for example and it
> contained "smile":
> string command;
> 
> command = "smile";
> test[command] should return "$N $vsmile." as well...
> Instead I get the error message:
> Index on bad type
An Index on bad type error occurs in two cases:
a) You declare test as mixed and assign an array value by accident.
b) You declare test as either mixed or mapping and forget entirely
   to assign a value to it. A newly declared mapping has the value
   nil (or 0 depending on your dgd version), which is 
   different to ([]) (an empty mapping)

> 
> There must be something really obvious to the rest of you as
> to what Im missing.  
Perhaps you start with an easy example, where you create a new mapping,
and read it afterwards in the same function, just to get a feeling how a 
mapping works. All what I can see is the typo in the first statement
you wrote, and this is probably a typo in this mail only.

> I blame my current bout of stupidity on a vicious bout of the flu :)
well catch a good nicht of sleep then and "Gute Besserung"
> 
> |- mud at hal9000.net.au -|oOoOoOoOoOoOoOoOoOoOoOoOoOoOo...............
> 
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> 

good luck
Ludger

void map_test()
{
    mapping test;
    test = (["smile":"$N $vsmile.", "grin":"$N $vgrin."]);
    write(test["smile"]+"\n");
}

works fine for me. (Outputs "$N $vsmile." to the current user)

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