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Include the accessor in the SourcePath hash

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This commit is contained in:
Eelco Dolstra 2024-07-15 15:46:30 +02:00
parent cdc23b67a6
commit 550b3479cf
2 changed files with 19 additions and 1 deletions
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6
src/libutil/source-path.hh
View file

@ -9,6 +9,8 @@
#include "canon-path.hh"
#include "source-accessor.hh"
#include <boost/functional/hash.hpp> // for boost::hash_combine
namespace nix {
/**
@ -128,6 +130,8 @@ struct std::hash<nix::SourcePath>
{
std::size_t operator()(const nix::SourcePath & s) const noexcept
{
return std::hash<decltype(s.path)>{}(s.path);
std::size_t hash = 0;
hash_combine(hash, s.accessor->number, s.path);
return hash;
}
};

14
src/libutil/util.hh
View file

@ -360,4 +360,18 @@ inline std::string operator + (std::string_view s1, const char * s2)
return s;
}
/**
* hash_combine() from Boost. Hash several hashable values together
* into a single hash.
*/
inline void hash_combine(std::size_t & seed) { }
template <typename T, typename... Rest>
inline void hash_combine(std::size_t & seed, const T & v, Rest... rest)
{
std::hash<T> hasher;
seed ^= hasher(v) + 0x9e3779b9 + (seed<<6) + (seed>>2);
hash_combine(seed, rest...);
}
}