ICollection.h

#ifndef SSP21_ICOLLECTION_H
#define SSP21_ICOLLECTION_H

#include <cstdint>

namespace ssp21
{
    /**
    *
    * A unmodifiable collection of some abstract type T
    *
    */
    template <class T>
    class ICollection
    {

    public:

        virtual uint32_t count() const = 0;

        virtual T const* get(uint32_t i) const = 0;

        bool is_empty() const
        {
            return this->count() == 0;
        }

        bool is_not_empty() const
        {
            return this->count() != 0;
        }

        virtual T const* last() const
        {
            if (this->is_empty())
            {
                return nullptr;
            }
            else
            {
                return this->get(this->count() - 1);
            }
        }

        template <class Action>
        void foreach(const Action& action) const
        {
            for (uint32_t i = 0; i < count(); ++i)
            {
                action(*this->get(i));
            }
        }
    };
}

#endif