struct AnyForwardIndex A wrapper over an underlying ForwardIndexType that hides the specific underlying type. See Also: AnyForwardCollection Inheritance Equatable, ForwardIndexType, _Incrementable View Protocol Hierarchy → Associated Types Distance = IntMax Import import Swift Initializers init(_:) Wrap and forward operations to base. Declaration init<BaseIndex : ForwardIndexType>(_ base: BaseIndex) Instance Methods func advancedBy(_:) Return the result of advancing self by n positions. Returns: - If n > 0, the result of applying successor to self n times. - If n < 0, the result of applying predecessor to self -n times. - Otherwise, self. Requires: n >= 0 if only conforming to ForwardIndexType Complexity: - O(1) if conforming to RandomAccessIndexType - O(abs(n)) otherwise Declaration func advancedBy(n: AnyForwardIndex.Distance) -> AnyForwardIndex Declared In ForwardIndexType func advancedBy(_:limit:) Return the result of advancing self by n positions, or until it equals limit. Returns: - If n > 0, the result of applying successor to self n times but not past limit. - If n < 0, the result of applying predecessor to self -n times but not past limit. - Otherwise, self. Requires: n >= 0 if only conforming to ForwardIndexType. Complexity: - O(1) if conforming to RandomAccessIndexType - O(abs(n)) otherwise Declaration func advancedBy(n: AnyForwardIndex.Distance, limit: AnyForwardIndex) -> AnyForwardIndex Declared In ForwardIndexType func distanceTo(_:) Measure the distance between self and end. Requires: - start and end are part of the same sequence when conforming to RandomAccessSequenceType. - end is reachable from self by incrementation otherwise. Complexity: - O(1) if conforming to RandomAccessIndexType - O(n) otherwise, where n is the function's result. Declaration func distanceTo(end: AnyForwardIndex) -> AnyForwardIndex.Distance Declared In ForwardIndexType func successor() Return the next consecutive value in a discrete sequence of AnyForwardIndex values. Requires: self has a well-defined successor. Declaration func successor() -> AnyForwardIndex