Help with Associative array problems.

[Frits van Bommel]

Spacen Jasset wrote:
> The program below does not print what it should, either using a File or 
> the TArrayStream.
> 
> It prints this:
> 
> user at vm-fruitbat:~$ dmd t.d
> user at vm-fruitbat:~$ ./t
> Error: 4invalid UTF-8 sequence
> Material user at vm-fruitbat:~$
> 
[snip]
>     foreach(ulong line_no, ref string line; file) {
>         string words[] = line.split();
>               m[words[1]] = 1;    
>     }
>         foreach (char[] k, ref int v; m) {
>         writefln("Material %s", k);
>     }
> }

File.opApply (which is called by foreach), as implemented in superclass 
Stream, re-uses a (stack-allocated) buffer for each iteration. This is 
more efficient, but means the string put into the loop variable is only 
valid for that iteration; if you want to keep it beyond that you need to 
allocate a copy.
This is mentioned in the documentation for InputStream[1]: "The string 
passed in line may be reused between calls to the delegate."


[1] <http://www.digitalmars.com/d/1.0/phobos/std_stream.html>, search 
for "opApply".