Efficiently streaming data to associative array

[kerdemdemir via Digitalmars-d-learn]

> I haven't yet dug into formattedRead but thx for letting me 
> know : )
> I was mostly speaking about the pattern with the AA. I guess 
> the best I can do is a templated function to hide the ugliness.
>
>
> ref Value GetWithDefault(Value)(ref Value[string] map, const 
> (char[]) key) {
>   auto pValue = key in map;
>   if(pValue) return *pValue;
>   return map[key.idup] = Value.init;
> }
>
> void main() {
>
>   size_t[string][string] indexed_map;
>
>   foreach(char[] line ; stdin.byLine) {
>     char[] a;
>     char[] b;
>     size_t value;
>     line.formattedRead!"%s,%s,%d"(a,b,value);
>
>     indexed_map.GetWithDefault(a).GetWithDefault(b) = value;
>   }
>
>   indexed_map.writeln;
> }
>
>
> Not too bad actually !

As a total beginner I am feeling a bit not comfortable with basic 
operations in AA.

First even I am very happy we have pointers but using pointers in 
a common operation like this IMHO makes the language a bit not 
safe.

Second "in" keyword always seemed so specific to me.

I think I will use your solution "ref Value 
GetWithDefault(Value)" very often since it hides the two things 
above.