25 lines
677 B
Text
25 lines
677 B
Text
use Any
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use Boolean
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use Option
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```doc
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# LogicalAnd
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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 LogicalAnd, as: do
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```doc
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Should the value be considered `true` for purposes of an `&&` expression?
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Must be implemented.
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```
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def true?(self: Self): Boolean
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```doc
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A short-circuiting logical and operation.
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If `LogicalAnd.true?` is true for both the left-hand and right-hand values, the right-hand value is returned. Otherwise None.
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```
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def and(self: Self, _other: Any): Option, when: true?(self) && true?(other), as: Option.some(other)
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def and(_self: Self, _other: Any): Option, as: Option.none()
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end
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