[squeak-dev] Re: Can we change the meaning of peekBack?

Eliot Miranda eliot.miranda at gmail.com
Mon Jul 28 19:46:28 UTC 2014


Hi Nicolas,

    Why can't you use peekLast?  Seems to me ensureEndsWith: should be implemented in terms of peekLast.

Aloha,
Eliot (phone)

On Jul 28, 2014, at 5:05 AM, Nicolas Cellier <nicolas.cellier.aka.nice at gmail.com> wrote:

> 
> 
> 
> 2014-07-28 17:02 GMT+02:00 Nicolas Cellier <nicolas.cellier.aka.nice at gmail.com>:
>> Hi, I need to retrieve the last object put on a Stream (well SmartRefStream does).
>> This is very much like #ensureEndsWith:
>> 
>> There is back, but back leave the stream positionned before the last object.
>> 
>> ((ReadWriteStream on: String new) nextPutAll: 'abc'; back) -> $c
>> ((ReadWriteStream on: String new) nextPutAll: 'abc'; back; position) -> 2.
>> 
>> There is peekBack, but peekBack answers the last but one...
>> 
>> ((ReadWriteStream on: String new) nextPutAll: 'abc'; peekBack) -> $b.
>> ((ReadWriteStream on: String new) nextPutAll: 'abc'; peekBack; position) -> 3.
>> 
>> Note that neither back nor peekBack is understood by a WriteStream.
>> It requires a ReadWriteStream.
>> 
>> Since peekBack is the sole sender of oldBack in trunk, I wonder who is using it?
>> I ask because I'd like to change the meaning of peekBack to that of back instead of oldBack.
>> Unless you have a better selector to propose?
> 
> More exactly, I'd like to implement PositionnableStream>>peekBackFor: anObject to return a Boolean like peekFor: and it would be a good thing that peekBack answers the same Object.
> 
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