The double-conversion package

[ Tags: bsd3, library, text ] [ Propose Tags ]

A library that performs fast, accurate conversion between double precision floating point and text.

This library is implemented as bindings to the C++ double-conversion library written by Florian Loitsch at Google:

The Text versions of these functions are about 30 times faster than the default show implementation for the Double type.

The ByteString versions are slower than the Text versions; roughly half the speed. (This seems to be due to the cost of allocating ByteString values via malloc.)

As a final note, be aware that the bytestring-show package is about 50% slower than simply using show.

[Skip to Readme]


Dependencies base (==4.*), bytestring, ghc-prim, integer (==0.1.*), integer-gmp (>=0.2), text (>= [details]
License BSD3
Author Bryan O'Sullivan <>
Maintainer Bryan O'Sullivan <>
Category Text
Home page
Bug tracker
Source repository head: git clone
head: hg clone
Uploaded Sat Aug 25 04:10:20 UTC 2012 by BryanOSullivan
Distributions FreeBSD:, LTSHaskell:, NixOS:, Stackage:, Tumbleweed:
Downloads 19695 total (2220 in the last 30 days)
Rating 0.0 (0 ratings) [clear rating]
  • λ
  • λ
  • λ
Status Docs uploaded by user
Build status unknown [no reports yet]
Hackage Matrix CI





operate in developer mode


Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info


Maintainer's Corner

For package maintainers and hackage trustees

Readme for double-conversion-

[back to package description]

Welcome to double-conversion

double-conversion is a fast Haskell library for converting between double precision floating point numbers and text strings. It is implemented as a binding to the V8-derived C++ double-conversion library.

Join in!

We are happy to receive bug reports, fixes, documentation enhancements, and other improvements.

Please report bugs via the github issue tracker.

Master git repository:

  • git clone git://

There's also a Mercurial mirror:

  • hg clone

(You can create and contribute changes using either git or Mercurial.)


This library is written and maintained by Bryan O'Sullivan,