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[AutoDiff][stdlib] Conform Array.DifferentiableView to several collection protocols #59878

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[AutoDiff][stdlib] Conform Array.DifferentiableView to several collection protocols #59878

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42 changes: 42 additions & 0 deletions stdlib/public/Differentiation/ArrayDifferentiation.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -169,6 +169,48 @@ where Element: AdditiveArithmetic & Differentiable {
}
}

extension Array.DifferentiableView:
BidirectionalCollection,
Collection,
MutableCollection,
RandomAccessCollection,
RangeReplaceableCollection,
Sequence
where Element: Differentiable {
public typealias Element = Array<Element>.Element
public typealias Index = Array<Element>.Index
public typealias Indices = Array<Element>.Indices
public typealias SubSequence = Array<Element>.SubSequence

@inlinable
public subscript(position: Array<Element>.Index) -> Element {
_read { yield base[position] }
set { base[position] = newValue }
}

@inlinable
public subscript(bounds: Range<Array<Element>.Index>) -> Self.SubSequence {
_read { yield base[bounds] }
set { base[bounds] = newValue }
}

@inlinable
public mutating func replaceSubrange<C>(
_ subrange: Range<Self.Index>, with newElements: C
) where C : Collection, Self.Element == C.Element {
self[subrange] = Self.SubSequence(newElements)
}

@inlinable
public var startIndex: Index { base.startIndex }

@inlinable
public var endIndex: Index { base.endIndex }

@inlinable
public init() { self.init(.init()) }
}

/// Makes `Array` differentiable as the product manifold of `Element`
/// multiplied with itself `count` times.
extension Array: Differentiable where Element: Differentiable {
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