BItem.h

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#ifndef BENCODING_BITEM_H
#define BENCODING_BITEM_H

#include <memory>

namespace bencoding {

class BItemVisitor;

class BItem: public std::enable_shared_from_this<BItem> {
public:
    virtual ~BItem() = 0;


    virtual void accept(BItemVisitor *visitor) = 0;


    template <typename T>
    std::shared_ptr<T> as() {
        static_assert(std::is_base_of<BItem, T>::value,
            "T has to be a subclass of BItem");

        return std::dynamic_pointer_cast<T>(shared_from_this());
    }

protected:
    BItem();

private:
    // Disable copy construction and assignment for this class and subclasses.
    BItem(const BItem &) = delete;
    BItem &operator=(const BItem &) = delete;
};

} // namespace bencoding

#endif