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Add builtin function "partition"

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The implementation of "partition" in Nixpkgs is O(n^2) (because of the
use of ++), and for some reason was causing stack overflows in
multi-threaded evaluation (not sure why).

This reduces "nix-env -qa --drv-path" runtime by 0.197s and memory
usage by 298 MiB (in non-Boehm mode).
This commit is contained in:
Eelco Dolstra 2016-08-29 17:28:20 +02:00
parent c0a7b84748
commit 26d92017d3
7 changed files with 54 additions and 10 deletions
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1
tests/lang/eval-okay-partition.exp Normal file
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@ -0,0 +1 @@
{ right = [ 0 2 4 6 8 10 100 102 104 106 108 110 ]; wrong = [ 1 3 5 7 9 101 103 105 107 109 ]; }

5
tests/lang/eval-okay-partition.nix Normal file
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with import ./lib.nix;
builtins.partition
(x: x / 2 * 2 == x)
(builtins.concatLists [ (range 0 10) (range 100 110) ])