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[stdlib] Make String.UTF8View bidirectional

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This is a step along the way toward handling backward-compatiblity of UTF8View
slicing and preventing inadvertent creation of String instances that keep
inaccessible memory alive.
This commit is contained in:
Dave Abrahams
2017-07-17 11:26:35 -07:00
parent 56705736b4
commit e6519fbd2b
7 changed files with 116 additions and 38 deletions
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2
test/stdlib/StringDiagnostics_without_Foundation.swift
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@@ -7,7 +7,7 @@ func acceptsRandomAccessCollection<I: RandomAccessCollection>(_: I) {}
func testStringCollectionTypes(s: String) {
acceptsCollection(s.utf8)
acceptsBidirectionalCollection(s.utf8) // expected-error{{argument type 'String.UTF8View' does not conform to expected type 'BidirectionalCollection'}}
acceptsBidirectionalCollection(s.utf8)
acceptsRandomAccessCollection(s.utf8) // expected-error{{argument type 'String.UTF8View' does not conform to expected type 'RandomAccessCollection'}}
// UTF16View is random-access with Foundation, bidirectional without