| Copyright | (c) Henning Thielemann 2007 |
|---|---|
| Maintainer | haskell@henning-thielemann.de |
| Stability | stable |
| Portability | Haskell 98 |
| Safe Haskell | None |
| Language | Haskell98 |
Number.NonNegative
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
C.
- 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 :: * -> *
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) | |
| Num a => Monoid (T a) | |
| (Ord a, Num a) => C (T a) | |
| (Ord a, C a) => C (T 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) | |
| (Ord a, C a) => C (T a) | |
| (C a, Ord 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) | |
| (Ord a, C a) => C (T a) | |
| (Ord a, C a) => C (T a) | |
| (C 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.
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
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.