[swift-evolution] [Review] SE-0101: Rename sizeof and related functions to comply with API Guidelines

Erica Sadun erica at ericasadun.com
Thu Jun 30 18:59:18 CDT 2016

> On Jun 30, 2016, at 5:47 PM, James Berry <jberry at rogueorbit.com> wrote:
>> On Jun 30, 2016, at 4:05 PM, Dave Abrahams via swift-evolution <swift-evolution at swift.org> wrote:
>> on Thu Jun 30 2016, Erica Sadun <erica-AT-ericasadun.com> wrote:
>>>> On Jun 30, 2016, at 4:41 PM, Dave Abrahams <dabrahams at apple.com> wrote:
>>>>> I mentioned this in a comment on the gist already, but I'm really not
>>>>> digging the "array" in `arraySpacing`. We've already moved from top-level
>>>>> "stride" to "memory layout spacing," gaining plenty of clarity. I'm
>>>>> skeptical that the "array" adds anything more. Moreover, it muddies the
>>>>> waters by mentioning a specific type (Array) in a context where you're
>>>>> querying the memory layout properties of another type.
>>>> OK, I agree with that.  If we have “alignment” rather than
>>>> “defaultAlignment,” I suppose we can have plain “spacing.”
>>> No way to last-second sell you on interval rather than spacing?
>> If you can explain why it's better.
>>> // Returns the least possible interval between distinct instances of
>>> /// `T` in memory.  The result is always positive.
>> For me, “interval” doesn't go with “size” and “alignment,” which are all
>> about physical distances and locations.  There are all kinds of
>> “intervals,” e.g. time intervals.
> Hmm. Sounds like stride to me. stride or byteStride?
> James

FAQ: "Why aren't you using the obvious phrase `stride` for something that clearly 
returns the memory stride?"

ANSWER: "As stride already has a well-established meaning in the standard library,
this proposal changes the name to spacing, providing a simple but correct name that
works well enough in its intended use. Measuring memory is sufficiently esoteric
that we prefer to reserve `stride` for a more common use case."

-- E

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