Array.formIndex(after:)

源码

swift/stdlib/public/core/Array.swift

  /// Replaces the given index with its successor.
  ///
  /// - Parameter i: A valid index of the collection. `i` must be less than
  ///   `endIndex`.
  @inlinable
  public func formIndex(after i: inout Int) {
    // NOTE: this is a manual specialization of index movement for a Strideable
    // index that is required for Array performance.  The optimizer is not
    // capable of creating partial specializations yet.
    // NOTE: Range checks are not performed here, because it is done later by
    // the subscript function.
    i += 1
  }

总结

• Swift函数：Array.formIndex(after:)
  • 定义
    • formIndex(after i: inout Int)
  • 参数
    • 变量名
      • 传入：after
      • 内部：i
      • 类型：inout Int == 指针类型，内部会改变值
  • 返回值
    • 传入的after==i （值已加1）