functional.h

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#ifndef QB_FUNCTIONAL_H
#define QB_FUNCTIONAL_H
#include <functional>
 
namespace qb {

template <typename T>
void
_hash_combine(size_t &seed, const T &val) {
    seed ^= std::hash<T>()(val) + 0x9e3779b9 + (seed << 6u) + (seed >> 2u);
}

template <typename... Types>
size_t
hash_combine(const Types &...args) {
    size_t seed = 0;
    (_hash_combine(seed, args), ...); // create hash value with seed over all args
    return seed;
}
} // namespace qb
 
#endif // QB_FUNCTIONAL_H