Built-in arrays as output ranges

[Andrei Alexandrescu]

Steve Teale wrote:
>> enforce() will never be disabled.
>>
>> As an aside, I just realized I haven't implemented put for strings yet,
>> and also that I'd promised a check in this weekend.
>>
>>
>> Andrei
> 
> Actually, thinking about this overnight, I'm a bit unhappy about giving 
> the impression that a built-in array can serve as an output range. It 
> really isn't true unless you never want to see the output again. If you 
> do, some data structure is required, either a loose combination of an 
> array and an unprotected reference to its original state (arrays a and 
> b), or something more explicit like:
> 
> struct arrayOutputRange(T)
> {
>     T[] array;
>     uint pos;
> 
>     this(uint sx) { ... }
>     void put(T val) { ... }
> }
> 
> Steve
> 

copy(source, target) does make sense for arrays as output ranges. Since 
target is passed by value, your copy will see what's been copied.

Andrei