|Maintainer||John Goerzen <email@example.com>|
Numeric instances for Convertible.
Copyright (C) 2009-2011 John Goerzen firstname.lastname@example.org
All rights reserved.
For license and copyright information, see the file LICENSE
These instances perform conversion between numeric types such as Double, Int, Integer, Rational, and the like. Here are some notes about the conversion process:
Conversions from floating-point types such as Double to integral types are done via the
truncate function. This is a somewhat arbitrary decision; if you need different
behavior, you will have to write your own instance or manually perform the conversion.
All conversions perform bounds checking. If a value is too large for its destination
type, you will get a
ConvertError informing you of this. Note that this behavior
differs from functions in the Haskell standard libraries, which will perform the
conversion without error, but give you garbage in the end.
Conversions do not perform precision checking; loss of precision is implied with certain conversions (for instance, Double to Float) and this is not an error.