suggested change to foreach index

[BCS]

In article <e67qth$ugk$1 at digitaldaemon.com>, Ameer Armaly says...
>
>
>"BCS" <BCS at pathlink.com> wrote in message 
>news:e67p90$rol$1 at digitaldaemon.com...
>>I often find my self doing something like this:
>>
>> <code>
>> int i
>> char[] arr;
>>
>> foreach(int j, c; arr)
>> if(' ' == c)
>> {
>> i=j; // copy j out of foreach's scope
>> break;
>> }
>>
>> if(i < arr.length)
>> {
>> arr = arr.dup;
>> // use copy of j
>> foreach(inout c; arr[i..$])
>> if(' ' == c) c = '_';
>> }
>> </code>
>>
>> In this case it would be nice to be able to use a variable in the outer 
>> scope as the index in the foreach, e.i.
>>
>> <code>
>> int i
>> char[] arr;
>>
>> foreach(int i, c; arr)
>> if(' ' == c)
>> break;
>>
>> // i keeps the value from the last time through
>> ...
>> </code>
>>
>>
>> Thoughts comments??
>Wouldn't a function return serve a similar if not identical purpose? 
>
>
Yes, but that would require putting the foreach in a function. If it needs to
access local variables then it needs to be a nested function and therefore could
results in a lot of lookup by pointer. Also there is the added function call
overhead associated with it. If the code is performance critical all of these
are bad things.