numeric-prelude-0.0.5: An experimental alternative hierarchy of numeric type classes Source code Contents Index

Number.NonNegative Portability Haskell 98 Stability stable Maintainer haskell@henning-thielemann.de

Description

A type for non-negative numbers. It performs a run-time check at construction time (i.e. at run-time) and is a member of the non-negative number type class Numeric.NonNegative.Class.C.

Synopsis

data T a fromNumber :: (Ord a, C a) => a -> T a fromNumberMsg :: (Ord a, C a) => String -> a -> T a fromNumberClip :: (Ord a, C a) => a -> T a fromNumberUnsafe :: a -> T a toNumber :: T a -> a type Int = T Int type Integer = T Integer type Float = T Float type Double = T Double type Ratio a = T (T a) type Rational = T Rational

Documentation

data T a Source

Instances (Ord a, Num a, Bounded a) => Bounded (T a) (Ord a, Num a, Enum a) => Enum (T a) Eq a => Eq (T a) (Ord a, Floating a) => Floating (T a) (Ord a, Fractional a) => Fractional (T a) Integral a => Integral (T a) (Ord a, Num a) => Num (T a) Ord a => Ord (T a) Real a => Real (T a) RealFrac a => RealFrac (T a) Show a => Show (T a) (Num a, Arbitrary a) => Arbitrary (T a) (Ord a, Num a) => C (T a) (Ord a, C a) => C (T a) (Ord a, C a) => C (T a) C a => C (T a) (Ord a, C a) => C (T a) (C a, C a) => C (T a) (Ord a, C a) => C (T a) (Ord a, C a) => C (T a) C a => C (T a) C a => C (T a) C a => C (T a) (Ord a, C a) => C (T a) C a => C (T a) (Ord a, C a) => C (T a)

fromNumber :: (Ord a, C a) => a -> T a Source

Convert a number to a non-negative number. If a negative number is given, an error is raised.

fromNumberMsg Source

:: (Ord a, C a) => String -> a -> T a

fromNumberClip :: (Ord a, C a) => a -> T a Source

Convert a number to a non-negative number. A negative number will be replaced by zero. Use this function with care since it may hide bugs.

fromNumberUnsafe :: a -> T a Source

Wrap a number into a non-negative number without doing checks. This routine exists entirely for efficiency reasons and must be used only in cases where you are absolutely sure, that the input number is non-negative.

toNumber :: T a -> a Source

type Int = T Int Source

type Integer = T Integer Source

type Float = T Float Source

type Double = T Double Source

type Ratio a = T (T a) Source

type Rational = T Rational Source

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