Cache.hpp

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#pragma once
 
#include <cstddef>
#include <functional>
 
namespace volcart
{
template <typename TKey, typename TValue>
class Cache
{
public:
    virtual ~Cache() = default;
 
    using Pointer = std::shared_ptr<Cache>;
 
    virtual void setCapacity(std::size_t newCapacity) = 0;
 
    [[nodiscard]] virtual auto capacity() const -> std::size_t = 0;
 
    [[nodiscard]] virtual auto size() const -> std::size_t = 0;
    virtual auto get(const TKey& k) -> TValue = 0;
 
    virtual auto put(const TKey& k, const TValue& v) -> void = 0;
 
    virtual auto contains(const TKey& k) -> bool = 0;
 
    virtual void onEvict(std::function<bool(TKey&, TValue&)> fn) = 0;
 
    virtual void resetOnEvict() = 0;
 
    virtual auto evict() -> void = 0;
 
    virtual auto purge() -> void = 0;
protected:
    Cache() = default;
 
    explicit Cache(const std::size_t capacity) : capacity_{capacity} {}
 
    std::size_t capacity_{200};
 
    std::function<bool(TKey&, TValue&)> on_eject_;
};
}  // namespace volcart