//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//

%{
from gyb_stdlib_unittest_support import TRACE, stackTrace, trace
}%

public func checkStrideable<S : Strideable>(
  instances: [S],
  distances: [S.Stride],
  distanceOracle: (Int, Int) -> S.Stride,
  ${TRACE}
) {
  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)))
    }
  }
}