#pragma once

#include <Orange/Core/Types.h>

namespace orange
{
    constexpr uint32_t HashString(const char* s, size_t count)
    {
        return ((count ? HashString(s, count - 1) : 2166136261u) ^ s[count]) * 16777619u;
    }

    constexpr uint32_t operator"" _hash(const char* s, size_t count)
    {
        return HashString(s, count);
    }

    inline size_t& hashCombine(size_t& seed) { (void)seed; return seed; }

    template <typename T, typename... Rest>
    inline size_t& hashCombine(size_t& seed, const T& v, Rest... rest)
    {
        std::hash<T> hasher;
        seed ^= hasher(v) + 0x9e3779b9 + (seed<<6) + (seed>>2);
        hashCombine(seed, rest...);
        return seed;
    }
}