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https://github.com/privatevoid-net/nix-super.git
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44c92a1667
there's a couple places that can be easily converted from using strings to using
string_views instead. gives a slight (~1%) boost to system eval.
# before
nix eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'
Time (mean ± σ): 2.946 s ± 0.026 s [User: 2.655 s, System: 0.209 s]
Range (min … max): 2.905 s … 2.995 s 20 runs
# after
Time (mean ± σ): 2.928 s ± 0.024 s [User: 2.638 s, System: 0.211 s]
Range (min … max): 2.893 s … 2.970 s 20 runs
51 lines
870 B
C++
51 lines
870 B
C++
#pragma once
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#include "ref.hh"
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#include <list>
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#include <set>
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#include <string>
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#include <map>
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#include <vector>
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namespace nix {
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using std::list;
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using std::set;
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using std::vector;
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using std::string;
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typedef list<string> Strings;
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typedef set<string> StringSet;
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typedef std::map<string, string> StringMap;
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/* Paths are just strings. */
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typedef string Path;
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typedef std::string_view PathView;
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typedef list<Path> Paths;
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typedef set<Path> PathSet;
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typedef vector<std::pair<string, string>> Headers;
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/* Helper class to run code at startup. */
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template<typename T>
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struct OnStartup
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{
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OnStartup(T && t) { t(); }
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};
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/* Wrap bools to prevent string literals (i.e. 'char *') from being
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cast to a bool in Attr. */
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template<typename T>
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struct Explicit {
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T t;
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bool operator ==(const Explicit<T> & other) const
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{
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return t == other.t;
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}
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};
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}
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