Program Listing for File enumerator.h

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#pragma once

#include "utility/assert.h"

namespace gpa {
namespace playback {

template<typename T>
class Enumerator
{
public:
    class Iterator final
    {
    public:
        Iterator() = default;

        inline Iterator(T const** ptr)
            : mPtr{ptr}
        {
        }

        Iterator(Iterator const& other) = default;

        Iterator& operator=(Iterator const& other) = default;

        inline Iterator& operator++()
        {
            ++mPtr;
            return *this;
        }

        inline Iterator operator++(int)
        {
            Iterator temp = *this;
            operator++();
            return temp;
        }

        inline bool operator==(Iterator const& other)
        {
            return mPtr == other.mPtr;
        }

        inline bool operator!=(Iterator const& other)
        {
            return !(*this == other);
        }

        inline T const* operator->() const
        {
            return mPtr ? *mPtr : nullptr;
        }

        inline T const& operator*() const
        {
            auto pObj = operator->();
            if (!pObj) {
                static T sObj;
                return sObj;
            }
            return *pObj;
        }

    private:
        T const** mPtr{nullptr};
    };

    Enumerator() = default;

    inline Enumerator(
        T const** pBegin,
        T const** pEnd)
        : mBegin(pBegin)
        , mEnd(pEnd)
    {
    }

    inline Iterator begin() const
    {
        return mBegin;
    }

    inline Iterator end() const
    {
        return mEnd;
    }

private:
    Iterator mBegin{nullptr};
    Iterator mEnd{nullptr};
};

}  // namespace playback
}  // namespace gpa