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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
public func checkStrideable<S : Strideable>(
instances: [S],
distances: [S.Stride],
distanceOracle: (Int, Int) -> S.Stride,
_ message: @autoclosure () -> String = "",
stackTrace: SourceLocStack = SourceLocStack(),
showFrame: Bool = true,
file: String = #file, line: UInt = #line
) {
for i in instances.indices {
let first = instances[i]
for j in instances.indices {
let second = instances[j]
expectEqual(distanceOracle(i, j), first.distance(to: second))
expectEqual(second, first.advanced(by: distanceOracle(i, j)))
}
}
}
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