https://d.puremagic.com/issues/show_bug.cgi?id=5530


Peter Alexander <peter.alexander.au@gmail.com> changed:

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                 CC|                            |peter.alexander.au@gmail.co
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--- Comment #1 from Peter Alexander <peter.alexander.au@gmail.com> 2014-01-25 14:00:32 PST ---
What's wrong with `walkLength`? If the range has `.length` (and isn't a narrow string) then walkLength just returns .length

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--- Comment #2 from bearophile_hugs@eml.cc 2014-01-25 15:10:22 PST ---
(In reply to comment #1)
> What's wrong with `walkLength`?

Its semantics and performance are different for narrow strings, that are common
use case. len is O(1), walkLength is sometimes O(n).

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--- Comment #3 from Peter Alexander <peter.alexander.au@gmail.com> 2014-01-25 15:31:05 PST ---
(In reply to comment #2)
> (In reply to comment #1)
> > What's wrong with `walkLength`?
> 
> Its semantics and performance are different for narrow strings, that are common
> use case. len is O(1), walkLength is sometimes O(n).

So am I right in saying that your proposed 'len' function would return .length for narrow strings?

If that's the case then it would be a glaring inconsistency with the rest of Phobos, which has been very careful to treat strings as ranges of code points, and not code units. Having a single function break consistency for the sake of a few characters of typing convenience doesn't seem like a sensible thing to do.

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Andrei Alexandrescu <andrei@erdani.com> changed:

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
                 CC|                            |andrei@erdani.com
         Resolution|                            |WONTFIX


--- Comment #4 from Andrei Alexandrescu <andrei@erdani.com> 2014-01-25 15:44:52 PST ---
I understad the motivatio, but it's not nearly enough to justify a synonim for length.

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--- Comment #5 from Andrei Alexandrescu <andrei@erdani.com> 2014-01-25 15:45:31 PST ---
Sorry for the spelling errors - keyboard is acting up.

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