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core.​init.​control.​alternative

core.​init.​control.​alternative

source
alternative
assert
failure
guard
guardb
has_orelse
optional
source
@[class]
structure has_orelse  :
(Type u → Type v) → Type (max (u+1) v)
  • orelse : Π {α : Type ?}, f α → f α → f α

Instances
source
@[class]
structure alternative  :
(Type u → Type v) → Type (max (u+1) v)

Instances
source
def failure {f : Type u → Type v} [alternative f] {α : Type u} :
f α

Equations
source
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.

Equations
source
def assert {f : Type → Type v} [alternative f] (p : Prop) [decidable p] :
f (inhabited p)

Equations
source
def guardb {f : Type → Type v} [alternative f] :
bool → f unit

Equations
source
def optional {f : Type u → Type v} [alternative f] {α : Type u} :
f α → f (option α)

Equations

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