base-4.9.1.0: Basic libraries

LicenseBSD-style (see the LICENSE file in the distribution)
Maintainerlibraries@haskell.org
Stabilityexperimental
Portabilitynot portable
Safe HaskellSafe
LanguageHaskell2010

Data.Type.Bool

Description

Basic operations on type-level Booleans.

Since: 4.7.0.0

Synopsis

Documentation

type family If cond tru fls where ... #

Type-level If. If True a b ==> a; If False a b ==> b

Equations

If True tru fls = tru 
If False tru fls = fls 

type family a && b where ... infixr 3 #

Type-level "and"

Equations

False && a = False 
True && a = a 
a && False = False 
a && True = a 
a && a = a 

type family a || b where ... infixr 2 #

Type-level "or"

Equations

False || a = a 
True || a = True 
a || False = a 
a || True = True 
a || a = a 

type family Not a where ... #

Type-level "not"

Equations

Not False = True 
Not True = False