Documentation

Init.Data.Option.Basic

def Option.toMonad {m : Type u_1 → Type u_2} {α : Type u_1} [Monad m] [Alternative m] :
Option αm α
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    @[inline]
    def Option.toBool {α : Type u_1} :
    Option αBool
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      @[inline]
      def Option.isSome {α : Type u_1} :
      Option αBool
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        @[inline]
        def Option.isNone {α : Type u_1} :
        Option αBool
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          @[inline]
          def Option.isEqSome {α : Type u_1} [BEq α] :
          Option ααBool
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            @[inline]
            def Option.bind {α : Type u_1} {β : Type u_2} :
            Option α(αOption β) → Option β
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              @[inline]
              def Option.mapM {m : Type u_1 → Type u_2} {α : Type u_3} {β : Type u_1} [Monad m] (f : αm β) (o : Option α) :
              m (Option β)
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                theorem Option.map_id {α : Type u_1} :
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                def Option.filter {α : Type u_1} (p : αBool) :
                Option αOption α
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                  @[inline]
                  def Option.all {α : Type u_1} (p : αBool) :
                  Option αBool
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                    @[inline]
                    def Option.any {α : Type u_1} (p : αBool) :
                    Option αBool
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                      @[macro_inline]
                      def Option.orElse {α : Type u_1} :
                      Option α(UnitOption α) → Option α
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                        instance Option.instOrElseOption {α : Type u_1} :
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                        • Option.instOrElseOption = { orElse := Option.orElse }
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                        def Option.lt {α : Type u_1} (r : ααProp) :
                        Option αOption αProp
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                          instance Option.instDecidableRelOptionLt {α : Type u_1} (r : ααProp) [s : DecidableRel r] :
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                          • One or more equations did not get rendered due to their size.
                          def Option.merge {α : Type u_1} (fn : ααα) :
                          Option αOption αOption α

                          Take a pair of options and if they are both some, apply the given fn to produce an output. Otherwise act like orElse.

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                            instance instDecidableEqOption :
                            {α : Type u_1} → [inst : DecidableEq α] → DecidableEq (Option α)
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                            • instDecidableEqOption = decEqOption✝
                            instance instBEqOption :
                            {α : Type u_1} → [inst : BEq α] → BEq (Option α)
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                            • instBEqOption = { beq := beqOption✝ }
                            instance instLTOption {α : Type u_1} [LT α] :
                            LT (Option α)
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                            • instLTOption = { lt := Option.lt fun x x_1 => x < x_1 }
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                            def liftOption {m : Type u_1 → Type u_2} {α : Type u_1} [Alternative m] :
                            Option αm α
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                              @[inline]
                              def Option.tryCatch {α : Type u_1} (x : Option α) (handle : UnitOption α) :
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