mathlib3 documentation

core / init.control.alternative

source
@[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
source
@[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
source
def failure {f : Type u → Type v} [alternative f] {α : Type u} :
f α
Equations
Instances for failure
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
Instances for guard
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} (x : f α) :
f (option α)
Equations
Instances for optional