14 lines
335 B
Text
14 lines
335 B
Text
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```doc
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# Subtraction
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Values which wish to implement the `-` infix operator must implement this protocol.
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```
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protocol Subtraction, as:
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```doc
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Subtract `rhs` from `lhs`, returning an option.
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It is left up to the implementer to define when it should return `Some` or `None`.
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```
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def subtract(lhs: Self, rhs: Any): Option
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end
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