func replace()

in Sources/_CollectionsTestSupport/MinimalTypes/_CollectionState.swift [199:215]

• 17 lines of code
• 6 McCabe index (conditional complexity)

  func replace(oldCount: Int, at offset: Int, with newCount: Int) {
    precondition(oldCount >= 0 && offset >= 0 && newCount >= 0)
    precondition(offset + oldCount <= self.count)
    guard oldCount > 0 || newCount > 0 else { return }
    switch strategy {
    case .allIndices:
      self.count += newCount - oldCount
    case .afterChange:
      let rest = offset ..< self.count
      self.indexValidity.replaceSubrange(
        rest,
        with: repeatElement(id, count: rest.count + newCount - oldCount))
      self.endIndexValidity = self.id
      self.count += newCount - oldCount
      assert(indexValidity.count == self.count)
    }
  }