mathlib3 documentation

core / init.control.alternative

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@[class]
structure has_orelse (f : Type u → Type v) :
Type (max (u+1) v)
Instances of this typeclass
Instances of other typeclasses for has_orelse
  • has_orelse.has_sizeof_inst
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@[class]
structure alternative (f : Type u → Type v) :
Type (max (u+1) v)
Instances of this typeclass
Instances of other typeclasses for alternative
  • alternative.has_sizeof_inst
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def failure {f : Type u → Type v} [alternative f] {α : Type u} :
f α
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def guard {f : Type → Type v} [alternative f] (p : Prop) [decidable p] :
f unit

If the condition p is decided to be false, then fail, otherwise, return unit.

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def assert {f : Type → Type v} [alternative f] (p : Prop) [decidable p] :
f (inhabited p)
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def guardb {f : Type → Type v} [alternative f] :
bool → f unit
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def optional {f : Type u → Type v} [alternative f] {α : Type u} (x : f α) :
f (option α)
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Instances for optional