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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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9
src/libexpr/value.hh
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@ -250,4 +250,13 @@ void mkPath(Value & v, const char * s);
size_t valueSize(Value & v);
#if HAVE_BOEHMGC
typedef std::vector<Value *, gc_allocator<Value *> > ValueVector;
typedef std::map<Symbol, Value *, std::less<Symbol>, gc_allocator<Value *> > ValueMap;
#else
typedef std::vector<Value *> ValueVector;
typedef std::map<Symbol, Value *> ValueMap;
#endif
}