El 21/03/2012 19:29, H. S. Teoh escribió:
A question was asked on the d-learn forum about why this throws a
RangeError:
int[string][int] map;
map["abc"][20]++;
IIRC, that worked fine for me a few weeks ago. And I found it to be just
great that it did. I'll have to re-check but I remember it like this.
I had to produce a new tabular dataset from an original by accumulating
elements (rows) sharing some attribute values.
The idea was to read that line by line, split into attributes and do:
// this will hold the counts:
int[int][int][int][string] count;
// for each row, split field1 .. field5 (field4 is a string)
count[field1][field2][field3][field4] += field5;
And that just worked IIRC, without initializing anything!
At the end, to iterate all the hyper map and write it out, we used
nested foreachs, something like:
foreach(field1, item1; count)
foreach(field2, item2; item1)
foreach(field3, item3; item2)
foreach(field4, field5; item3)
writeln(field1, field2, field3, field4, field5);
I'm trying to remember if we had to do something special to make it work...
