Swfit_Array_GDG.pdf
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Swift is a modern programming language that is fast, safe, and powerful. It is easy to learn and widely used to build iOS and macOS apps. Arrays in Swift can be used as stacks for efficient append and removal of elements. There are three main array types: ContiguousArray for C-like performance on elements stored contiguously in memory, Array for general-purpose use, and ArraySlice for a view of a portion of an array. Copy on write optimization allows arrays to efficiently be passed by value without unnecessary copying of elements.
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Swfit_Array_GDG.pdf
- 3. iPhone 6 1972 1983 2010 2014 2007 2022 iPhone 14 iPhone Begin ?
- 4. Swift Fast, Safe, Powerful Modern, Easy to learn
- 5. Array
- 6. Design Goal 1.Performance equivalent to C arrays for subscript get/set of non- class element types is the most important performance goal. 2.It should be possible to receive an NSArray from Cocoa, represent it as an Array<AnyObject>, and pass it right back to Cocoa as an NSArray in O(1) and with no memory allocations. 3.Arrays should be usable as stacks, so we want amortized O(1) append and O(1) popBack. Together with goal #1, this implies a std::vector-like layout, with a reserved tail memory capacity that can exceed the number of actual stored elements.
- 8. WHAT IS COCOA? Cocoa is an application environment for both the OS X operating system and iOS, the operating system used on Multi-Touch devices such as iPhone, iPad, and iPod touch. It consists of a suite of object-oriented software libraries, a runtime system, and an integrated development environment.
- 9. COCOA FRAMEWORK COCOA TOUCH VS COCOA MAC iPhone
- 11. Performance
- 12. Swift provides three generic array types
- 14. ContiguousArray<Element> ContiguousArray<Element> is the fastest and simplest of the three--use this when you need "C array" performance. The elements of a ContiguousArray are always stored contiguously in memory.
- 20. __ContiguousArrayStorageBase supplies the implementation of the _NSArrayCore API (and thus, NSArray the API) for our _ContiguousArrayStorage<T>. We can't put this implementation directly on _ContiguousArrayStorage because generic classes can't override Objective-C selectors.
- 24. Array Append
- 25. Append
- 26. Returns `true` and puts the bu ff er in a mutable state if the bu ff er's storage is uniquely-referenced; otherwise, performs no action and returns `false`. - Precondition: The bu ff er must be immutable. - Warning: It's a requirement to call `beginCOWMutation` before the bu ff er is mutated. Permission
- 32. Space?
- 33. The number of elements of buffer The number of elements of buffer is longer than capacity
- 35. The number of elements of buffer The number of elements of buffer is longer than capacity
- 39. Optimization
- 40. Copy On Write Struct Struct Copy
- 41. Copy On Write Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct …
- 42. Copy On Write Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct Struct First Index
- 44. Append
- 47. Append
- 50. Array Remove
- 56. To be Remove(pointer) Source( pointer + 1)
- 59. Thanks