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use a propper hash combiner

This commit is contained in:
Kevin Matz 2022-11-30 09:52:50 -05:00
parent 0ba1ecc9ac
commit 79ed3e5a8b
1 changed files with 17 additions and 4 deletions
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21
protocol/esta/sacn/data.h
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@ -183,6 +183,19 @@ public:
namespace std
{
template <class T>
/**
* @brief boost::hash_combine
* @param seed
* @param v
*/
inline void hash_combine(std::size_t& seed, const T& v)
{
std::hash<T> hasher;
seed ^= hasher(v) + 0x9e3779b9 + (seed<<6) + (seed>>2);
}
template<>
/**
* @brief The hash struct specilizaton for SACN::Provenance
@ -196,10 +209,10 @@ namespace std
*/
size_t operator()(sACN::DATA::data_header const& src) const noexcept
{
size_t h1 = hash<string>{}(src.source_name);
size_t h2 = hash<uint16_t>{}(src.universe);
size_t h3 = hash<uint8_t>{}(src.priority);
size_t h = h1 ^ h2 ^ h3; // or use boost::hash_combine
size_t h =0;
hash_combine(h, src.source_name);
hash_combine(h, src.universe);
hash_combine(h, src.priority);
return h;
}
};