Karoy Lorentey b7e08accb1 [stdlib] Slice: customize withContiguous[Mutable]StorageIfAvailable (#28883) ...

* [stdlib] Slice: customize withContiguous[Mutable]StorageIfAvailable

We can easily make an UnsafeBufferPointer that slices another UnsafeBufferPointer, so let’s allow Slice to vend a slice of the base collection’s contiguous storage, if it provides access to one.

We need to do some index distance calculations to implement this, but those will be constant-time in the usual case where the base collection is a RAC.

https://bugs.swift.org/browse/SR-11957
rdar://58090587

* [test] UnsafeBufferPointer: fix some warnings

* [stdlib] Slice: don’t calculate index distances unless the base provides contiguous mutable storage

2020-01-06 12:32:30 -05:00

4.0 KiB

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