IntegerBits.swift

extension BinaryInteger {
	subscript(bit index: Int) -> Bool {
		get {
			((self >> index) & Self(1)) == 1
		}
		set {
			if newValue {
				self |= (Self(1) << index)
			} else {
				self &= ~(Self(1) << index)
			}
		}
	}
	
	subscript(bits range: ClosedRange<Int>) -> Int {
		get {
			Int((~(~Self(0) << range.count)) & (self >> range.lowerBound))
		}
		set {
			let clampedAndShiftedValue = (((~(~Self(0) << range.count)) & Self(clamping: newValue)) << range.lowerBound)
			let shiftedMask = ~(~Self(0) << range.count) << range.lowerBound
			let selfWithBitRangeSetToZero = (~(self & shiftedMask) & self)
			self = selfWithBitRangeSetToZero | clampedAndShiftedValue
		}
	}
}