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Add preprocessor macro GTL_DISABLE_MIX #29

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merged 2 commits into from
Nov 2, 2024
Merged

Add preprocessor macro GTL_DISABLE_MIX #29

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1ec7500
Add preprocessor macro `GTL_DISABLE_MIX` to disable hash mixing.
greg7mdp Nov 2, 2024
ff22b8c
Merge branch 'main' of github.com:greg7mdp/gtl into phmap_252
greg7mdp Nov 2, 2024
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8 changes: 8 additions & 0 deletions include/gtl/phmap.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2520,7 +2520,11 @@ class raw_hash_set {
struct HashElement {
template<class K, class... Args>
size_t operator()(const K& key, Args&&...) const {
#if GTL_DISABLE_MIX
return h(key);
#else
return phmap_mix<sizeof(size_t)>()(static_cast<size_t>(h(key)));
#endif
}
const hasher& h;
};
Expand Down Expand Up @@ -4309,7 +4313,11 @@ class parallel_hash_set {
struct HashElement {
template<class K, class... Args>
size_t operator()(const K& key, Args&&...) const {
#if GTL_DISABLE_MIX
return h(key);
#else
return phmap_mix<sizeof(size_t)>()(h(key));
#endif
}
const hasher& h;
};
Expand Down