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Switch default mixing policy from xmx to mulx

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This commit is contained in:
Peter Dimov
2023-01-27 08:15:37 +02:00
parent 9bc471310e
commit 0f8dd003a3
1 changed files with 6 additions and 4 deletions
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10
include/boost/unordered/detail/foa.hpp
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@ -726,9 +726,11 @@ private:
std::size_t pos,step=0;
};
/* Mixing policies: no_mix is the identity function and xmx_mix uses the
* xmx function defined in <boost/unordered/detail/xmx.hpp>.
* foa::table mixes hash results with xmx_mix unless the hash is marked as
/* Mixing policies: no_mix is the identity function, xmx_mix uses the
* xmx function defined in <boost/unordered/detail/xmx.hpp>, and mulx_mix
* uses the mulx function from <boost/unordered/detail/mulx.hpp>.
*
* foa::table mixes hash results with mulx_mix unless the hash is marked as
* avalanching, i.e. of good quality (see <boost/unordered/hash_traits.hpp>).
*/
@ -1164,7 +1166,7 @@ table:empty_value<Hash,0>,empty_value<Pred,1>,empty_value<Allocator,2>
using mix_policy=typename std::conditional<
hash_is_avalanching<Hash>::value,
no_mix,
xmx_mix
mulx_mix
>::type;
using alloc_traits=boost::allocator_traits<Allocator>;