quox/examples/bool.quox

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load "misc.quox"
namespace bool {
def0 Bool : ★ = {true, false}
def if-dep : 0.(P : Bool → ★) → (b : Bool) → ω.(P 'true) → ω.(P 'false) → P b =
λ P b t f ⇒ case b return b' ⇒ P b' of { 'true ⇒ t; 'false ⇒ f }
def if : 0.(A : ★) → Bool → ω.A → ω.A → A =
λ A ⇒ if-dep (λ _ ⇒ A)
def0 if-same : (A : ★) → (b : Bool) → (x : A) → if A b x x ≡ x : A =
λ A b x ⇒ if-dep (λ b' ⇒ if A b' x x ≡ x : A) b (δ _ ⇒ x) (δ _ ⇒ x)
def if2 : 0.(A B : ★) → (b : Bool) → ω.A → ω.B → if¹ ★ b A B =
λ A B ⇒ if-dep (λ b ⇒ if¹ ★ b A B)
def0 T : Bool → ★ = λ b ⇒ if¹ ★ b True False
def dup : Bool → [ω.Bool] =
λ b ⇒ if [ω.Bool] b ['true] ['false]
def0 true-not-false : Not ('true ≡ 'false : Bool) =
λ eq ⇒ coe (𝑖 ⇒ T (eq @𝑖)) 'true
-- [todo] infix
def and : Bool → ω.Bool → Bool = λ a b ⇒ if Bool a b 'false
def or : Bool → ω.Bool → Bool = λ a b ⇒ if Bool a 'true b
}
def0 Bool = bool.Bool
def if = bool.if