constraint_count.h

#ifndef CACHEMERE_CONSTRAINT_COUNT_H
#define CACHEMERE_CONSTRAINT_COUNT_H
 
#include "cachemere/item.h"
 
namespace cachemere::policy {
 
template<typename Key, typename KeyHash, typename Value> class ConstraintCount
{
    using CacheItem = Item<Value>;
 
public:
    explicit ConstraintCount(size_t maximum_count);
 
    void clear();
 
    [[nodiscard]] bool can_add(const Key& key, const CacheItem& item);
 
    [[nodiscard]] bool can_replace(const Key& key, const CacheItem& old_item, const CacheItem& new_item);
 
    [[nodiscard]] bool is_satisfied();
 
    void update(size_t maximum_count);
 
    void on_insert(const Key& key, const CacheItem& item);
 
    void on_evict(const Key& key, const CacheItem& item);
 
    [[nodiscard]] size_t count() const;
 
    [[nodiscard]] size_t maximum_count() const;
 
private:
    size_t m_maximum_count;
    size_t m_count = 0;
};
 
}  // namespace cachemere::policy
 
#include "constraint_count.hpp"
 
#endif