HORIZON HASKELLDocslts/ghc-9.14.x7a6c33e2026-10-12Search packagesCtrl K
Theme: |

GHC 9.14.1 · lts/ghc-9.14.x · 7a6c33e · 2026-10-12

Modulezigzag-0.1.0.0Haskell2010

Data.Word.Zigzag

Zigzag encoding maps signed integers to unsigned integers so that numbers with a small absolute value (for instance, -1) have a small varint encoded value too. It does this in a way that "zig-zags" back and forth through the positive and negative integers, so that -1 is encoded as 1, 1 is encoded as 2, -2 is encoded as 3, and so on.

zigzag(n) = { 2 * n       if 0 <= n
            { -2 * n - 1  if n < 0

This description was adapted from https:/developers.google.comprotocol-buffersdocsencoding#signed-ints which is released under https://creativecommons.org/licenses/by/4.0/

Synopsis
  • Packagezigzag-0.1.0.0
  • Exports8
  • LanguageHaskell2010
  • LicenceBSD-3-Clause
  • SourceZigzag.hs

Encode a native-size integer with zigzag.

In C, this is:

(n << 1) ^ (n >> (CHAR_BIT * sizeof(int) - 1))