On Thu, 28 Feb 2013 11:43:06 -0500, Walter Bright
<newshou...@digitalmars.com> wrote:
On 2/28/2013 6:59 AM, Andrei Alexandrescu wrote:
On 2/28/13 2:37 AM, deadalnix wrote:
I don't see how defining a specific sentinel range here helps.
On first blush I agree. It may as well be a range that by convention is
sentinel-terminated, and there's calls to front and popFront but never
to empty.
Consider the following code from lexer.c:
p++;
switch (*p)
Written using an InputRange:
popFront();
switch (front)
That code is INVALID. This is why a SentinelInputRange is necessary. You
can't just use an InputRange in an invalid manner by convention.
Does switch(*p) include a case for 0? If so, wouldn't it be equivalent to
say if(empty) /* do stuff that case 0 does */ else switch(front)
-Steve
