%# -*- mode: swift -*-
//===--- Arrays.swift.gyb - NativeArray, Array, and Slice -----------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2015 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
//
//===----------------------------------------------------------------------===//
//
//  Three generic, mutable array-like types with value semantics.
//
//  - NativeArray<T> is a fast, contiguous array of T with a known
//    backing store.
//
//  - Slice<T> presents an arbitrary subsequence of some contiguous sequence
//    of Ts.
//
//  - Array<T> is like NativeArray<T> when T is not an ObjC type.
//    Otherwise, it may use an NSArray bridged from Cocoa for storage
//
//===----------------------------------------------------------------------===//

% for Self in ['NativeArray', 'Slice', 'NewArray']:
struct ${Self}<T> {
  typealias Element = T
  typealias Buffer = ${'Array' if Self.startswith('New') else Self}Buffer<T>

  var buffer: Buffer
}

extension ${Self} : Collection {
  var startIndex: Int {
    return 0
  }

  var endIndex: Int {
    return buffer.count
  }

  subscript(i: Int) -> Element {
    get {
      return buffer[i]
    }
  }

  func generate() -> IndexingGenerator<${Self}> {
    return IndexingGenerator(self)
  }
}

extension ${Self} /*: _ArrayType*/ {
  func toNativeBuffer(managedByCopyOnWrite: Bool)
  -> NativeArrayBuffer<Element> {
    return buffer.toNativeBuffer(managedByCopyOnWrite)
  }
  
  var count: Int {
    get {
      return buffer.count
    }
  }
}
%end

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