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# AdditiveArithmetic Implementations

## Topics

### Operators

[`static func + (Size3D, Size3D) -> Size3D`](/documentation/Spatial/Size3D/+(_:_:))

Returns a size that’s the element-wise sum of two sizes.

[`static func += (inout Size3D, Size3D)`](/documentation/Spatial/Size3D/+=(_:_:)-75tn3)

Adds two size structures and stores the result in the left-hand-side variable.

[`static func - (Size3D, Size3D) -> Size3D`](/documentation/Spatial/Size3D/-(_:_:))

Returns a size that’s the element-wise difference of two points.

[`static func -= (inout Size3D, Size3D)`](/documentation/Spatial/Size3D/-=(_:_:)-8t5kg)

Subtracts a size from a size and stores the difference in the left-hand-side variable.

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