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| struct Kollection<T> { | |
| var array: Array<T> | |
| let indices: [Int] | |
| subscript(indice: Int) -> T { | |
| get { | |
| precondition(indices.contains(indice)) | |
| return array[indice] | |
| } | |
| set { | |
| precondition(indices.contains(indice)) | |
| array[indice] = newValue | |
| } | |
| } | |
| subscript(indices indices: [Int]) -> Kollection<T> { | |
| get { | |
| precondition(!indices.contains { !self.indices.contains($0) }) | |
| return Kollection(array: array, indices: indices) | |
| } | |
| set { | |
| precondition(self.array.count == newValue.array.count) | |
| precondition(!newValue.indices.contains { !self.indices.contains($0) }) | |
| for i in newValue.indices { | |
| self[i] = newValue[i] | |
| } | |
| } | |
| } | |
| subscript(indices: Int...) -> Kollection<T> { | |
| get { | |
| return self[indices: indices] | |
| } | |
| set { | |
| self[indices: indices] = newValue | |
| } | |
| } | |
| subscript(where f: (T)->Bool) -> Kollection { | |
| get { | |
| let indices = self.indices.filter { f(array[$0]) } | |
| return self[indices: indices] | |
| } | |
| set { | |
| let indices = self.indices.filter { f(array[$0]) } | |
| self[indices: indices] = newValue | |
| } | |
| } | |
| mutating func update(f: (inout T)->Void) { | |
| for i in indices { | |
| f(&array[i]) | |
| } | |
| } | |
| } | |
| let a = [0, 1, 2, 3, 4] | |
| var k1 = Kollection(array: a, indices: [0, 1, 2, 3, 4]) | |
| print(k1) // Kollection<Int>(array: [0, 1, 2, 3, 4], indices: [0, 1, 2, 3, 4]) | |
| k1[indices: [0, 2, 4]].update { (a: inout Int) in a += 100 } | |
| print(k1) // Kollection<Int>(array: [100, 1, 102, 3, 104], indices: [0, 1, 2, 3, 4]) |
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