Bounded package:relude

The Bounded class is used to name the upper and lower limits of a type. Ord is not a superclass of Bounded since types that are not totally ordered may also have upper and lower bounds. The Bounded class may be derived for any enumeration type; minBound is the first constructor listed in the data declaration and maxBound is the last. Bounded may also be derived for single-constructor datatypes whose constituent types are in Bounded.

Transforms an integer number to a bounded integral. It returns Nothing for integers outside the bound of the return type.

>>> integerToBounded @Int 42
Just 42

>>> integerToBounded @Int8 1024
Nothing

>>> integerToBounded @Int (toInteger (minBound :: Int))
Just (-9223372036854775808)

>>> integerToBounded @Int $ (toInteger (minBound :: Int)) - 1
Nothing

>>> integerToBounded @Int (toInteger (maxBound :: Int))
Just 9223372036854775807

>>> integerToBounded @Int $ (toInteger (maxBound :: Int)) + 1
Nothing

If you want to convert Int or Word to a bounded type, take a look at toIntegralSized function instead.