Tests for deka, decimal floating point arithmetic.
deka provides decimal floating point arithmetic. It is based on mpdecimal, the C library used to provide support for the Decimal module in Python 3.
You will need to install mpdecimal to use deka; otherwise your executables will not link. It is available at
http://www.bytereef.org/mpdecimal/
mpdecimal has also been packaged for some Linux distributions, such as Debian (libmpdec-dev - available in Jessie and later) and Arch (mpdecimal).
mpdecimal, in turn, implements the General Decimal Arithmetic Specification, which is available at
http://speleotrove.com/decimal/
For more on deka, please see the Github home page at
https://github.com/massysett/deka
This package contains only tests, so that other packages may also use the tests.
deka
deka provides correctly rounded decimal arithmetic for Haskell.
The core of deka is a binding to the C library mpdecimal. You need to install mpdecimal; otherwise, your executables will not link. mpdecimal is available here:
http://www.bytereef.org/mpdecimal/index.html
mpdecimal has also been packaged for some Linux distributions, such as Debian (libmpdec-dev) and Arch (mpdecimal). deka has been tested with mpdecimal version 2.4.0.
As the author of deka, I have no association with the author of mpdecimal, and any errors in this library are mine and should be reported to [email protected] or to the Github tracker at
http://www.github.com/massysett/deka
You will want to understand the General Decimal Arithmetic Specification in order to fully understand deka. The specification is at
http://speleotrove.com/decimal/decarith.html
and more about decimal arithmetic generally at
http://speleotrove.com/decimal/
Dependencies
The main deka library depends only on base, bytestring, and parsec, so it shouldn't be difficult to build. The tests use tasty and QuickCheck.
Test status
deka is tested using the tests available on the General Decimal Arithmetic website:
http://speleotrove.com/decimal/dectest.html
Some of these tests currently fail. The failures are in edge cases that should not affect most usage. Diagnosing these failures is on the TODO list.
More documentation
Much more documentation is available in the Haddock comments in the source files. There is also a file of examples to get you started. It has copious comments. It is written in literate Haskell, so the compiler keeps me honest with the example code. Unfortunately Haddock does not play very nice with literate Haskell. However, the file is easy to view on Github:
License
deka is licensed under the BSD license, see the LICENSE file.