cache.h

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#if !defined(VITA_CACHE_H)
#define      VITA_CACHE_H
 
#include <shared_mutex>
 
#include "kernel/cache_hash.h"
#include "kernel/environment.h"
 
namespace vita
{
class cache
{
public:
  DISALLOW_COPY_AND_ASSIGN(cache);
 
  explicit cache(unsigned);
 
  void clear();
  void clear(const hash_t &);
 
  void insert(const hash_t &, const fitness_t &);
 
  const fitness_t &find(const hash_t &) const;
 
  bool is_valid() const;
 
  // Serialization.
  bool load(std::istream &);
  bool save(std::ostream &) const;
 
private:
  // Private support methods.
  std::size_t index(const hash_t &) const;
 
  // Private data members.
  struct slot
  {
    hash_t       hash;
    fitness_t fitness;
    unsigned     seal;
  };
 
  mutable std::shared_mutex mutex_;
 
  const std::uint64_t k_mask;
  std::vector<slot>   table_;
  decltype(slot::seal) seal_;
};
 
}  // namespace vita
 
#endif  // include guard