This is because popFront and front actually decode unicode chars. So
takeExactly works on 32-bit dchars, the ElementType of all strings.
On Fri, 19 Aug 2011 12:07:53 +0200, unDEFER <[email protected]> wrote:
On Fri, 19 Aug 2011 06:53:37 +0400, Jonathan M Davis
<[email protected]> wrote:
Hmmm. Such a function isn't entirely a bad idea, but it also makes me a
bit
nervous. Slicing is efficient. The slice function that you suggest is
not. I
mean, it's efficient enough for what it's doing, but it's not O(1) like
slicing
is, so having a slice function could be a bit misleading.
I know that it is not efficient, but here just appears the question why
D have decided not support 8-but encodings. Only its makes operations
like this efficient.
Once drop has been merged in, you'll be able do to this
auto s = takeExactly(drop(str, firstIndex), lastIndex - firstIndex));
to get the same effect. It may be worth adding such a function though.
I'm sorry, but looks like there is no "drop()" function.
Anyway, thank you. I really don't understand how takeExactly works, but
it works. For newbies it is really not obvious that std.range works fine
with UTF-8 strings.
Certainly
auto s = slice(firstIndex, lastIndex);
is cleaner. If we add it though, then we should probably give it a
different name. Maybe sliceByElementType? That does seem a bit long
though, if accurate.
In many other languages this function named as "subString".
We'd probably put it in std.range though rather than std.utf, since it
could
be useful for any range which isn't actually sliceable. And then
there's the
question of whether it would be better to make it lazy. It would make
it so
that it wasn't actually a string anymore, but it would make it more
efficient for all of the cases where you don't actually end up using
the whole slice.
You can make a pull request for it if you want to, and the best way to
handle it - as well as whether we actually want such a function - can
be discussed in the pull request. I do think that some thought is going
to have to go into what behavior we really want such a function to have
though (as well as the best name for it).
I'm not familiar with Git, but I'll try to think up anything.
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