dxvk/src/dxvk/dxvk_hash.h

#pragma once

#include <cstddef>

namespace dxvk {

  struct DxvkEq {
    template<typename T>
    size_t operator () (const T& a, const T& b) const {
      return a.eq(b);
    }
  };

  struct DxvkHash {
    template<typename T>
    size_t operator () (const T& object) const {
      return object.hash();
    }
  };
  
  class DxvkHashState {
    
  public:
    
    void add(size_t hash) {
      m_value ^= hash + 0x9e3779b9
               + (m_value << 6)
               + (m_value >> 2);
    }
    
    operator size_t () const {
      return m_value;
    }
    
  private:
    
    size_t m_value = 0;
    
  };

}