Portability | Haskell 98 |
---|---|

Stability | stable |

Maintainer | haskell@henning-thielemann.de |

Safe Haskell | Safe-Inferred |

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, Num a) => a -> T a
- fromNumberMsg :: (Ord a, Num a) => String -> a -> T a
- fromNumberClip :: (Ord a, Num 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 (Ratio a)
- type Rational = T Rational

# Documentation

(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) |

fromNumber :: (Ord a, Num a) => a -> T aSource

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

fromNumberClip :: (Ord a, Num a) => a -> T aSource

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 aSource

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.