Bool package:base

The Bool type and related functions.

Basic operations on type-level Booleans.

Case analysis for the Bool type. bool f t p evaluates to f when p is False, and evaluates to t when p is True. This is equivalent to if p then t else f; that is, one can think of it as an if-then-else construct with its arguments reordered.

Examples

Basic usage:

>>> bool "foo" "bar" True
"bar"

>>> bool "foo" "bar" False
"foo"

Confirm that bool f t p and if p then t else f are equivalent:

>>> let p = True; f = "bar"; t = "foo"

>>> bool f t p == if p then t else f
True

>>> let p = False

>>> bool f t p == if p then t else f
True

Haskell type representing the C bool type. (The concrete types of Foreign.C.Types#platform are platform-specific.)

Convert a Haskell Bool to its numeric representation

Convert a Boolean in numeric representation to a Haskell value