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Std.Foundation

packages/foundation/standard/src/Std/Foundation.alpha

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def · lines 231–240

stdOptionValueOr

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The value an option holds, or the supplied default. The element type is explicit, because the library never guesses a type.
231def stdOptionValueOr =
232  (lambda erased element : Type 0 .
233    (lambda unrestricted fallback : element .
234      (lambda unrestricted value : (family StdOption element) .
235        (eliminate
236          StdOption
237          (lambda unrestricted current : (family StdOption element) . element)
238          value
239          (branch StdNone . fallback)
240          (branch StdSome held . held)))))

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