The review of std.hash package

[Christophe Travert]

If a has is a range, it's an output range, because it's something you   
fee data to. Output range have only one method: put. Johannes used this 
method. But it's not sufficient, you need something to start and to 
finish the hash.

To bring consistency in the library, we should not remove this start and 
finish method. We should make all output range of the library use the 
same functions.

In the library, we have really few output range. We have writable input 
range and we have Appender. Is there more? There should be files, 
socket, maybe even signal, but IIRC these don't implement output range 
at the moment. What did I miss?

Appender doesn't use a finish method, but we have to 'get the 
result' of the appender, and for this we use appender.data. This name is 
not appropriate for generically getting a result or terminating an 
output range.

So We need a name that fits most output range use. start/finish sounds 
not bad. open/close fits files and socket, but many not all output 
ranges. Relying solely on constructors, opCall or alias this seems 
dangerous to me.

-- 
Christophe