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40650baf7f
Iterating over a `CxxSequence` that is not a `CxxRandomAccessCollection` triggers a copy of the C++ collection. Let's disable the automatic conformances until we find a more efficient solution. This means that for now developers won't be able to iterate over a `std::set` or `std::list` with a Swift for-in loop. I will submit a separate patch with an alternative solution for such types. C++ random access collections, such as `std::vector` or `std::string`, are not affected.
36 lines
787 B
Swift
36 lines
787 B
Swift
// RUN: %target-run-simple-swift(-I %S/Inputs -Xfrontend -enable-experimental-cxx-interop)
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//
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// REQUIRES: executable_test
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// REQUIRES: OS=macosx || OS=linux-gnu
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// REQUIRES: rdar102364960
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import StdlibUnittest
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import CustomSequence
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var CxxSequenceTestSuite = TestSuite("CxxSequence")
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CxxSequenceTestSuite.test("SimpleSequence as Swift.Sequence") {
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let seq = SimpleSequence()
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let contains = seq.contains(where: { $0 == 3 })
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expectTrue(contains)
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var items: [Int32] = []
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for item in seq {
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items.append(item)
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}
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expectEqual([1, 2, 3, 4] as [Int32], items)
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}
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CxxSequenceTestSuite.test("SimpleEmptySequence as Swift.Sequence") {
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let seq = SimpleEmptySequence()
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var iterated = false
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for _ in seq {
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iterated = true
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}
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expectFalse(iterated)
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}
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runAllTests()
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