Michel Fortin wrote:
On 2010-01-29 12:21:18 -0500, Andrei Alexandrescu
<seewebsiteforem...@erdani.org> said:
Michel Fortin wrote:
Yeah, it's less likely to be a problem. But "less likely to be a
problem" does still does not make things reliable. Something reliable
works all the time, or it just doesn't work and tells you.
stream.front after stream.popFront works all the time and fetches a
new line off the stream. Like Steve said, you can't at the same time
fetch a line and leave it back in the stream.
The problem is that algorithms that depends on this will work with other
ranges, but will fail silently when given a stream.
An algorithm can fail in many silent ways if it misuses the range
interface. None of std.algorithm algorithms uses front naively.
In all seriousness, even Java streams are better modeled than this
(although more limited by not having templates). The basic Java input
stream doesn't have a 'front' byte, you can only read the next byte (or
the few next bytes). If you need to rewind, there is a standard way, but
most streams need to be wrapped in a buffered stream first to provide
this capability.
Can you run a basic algorithm on a Java stream and on an array as well?
Andrei
