PMInserter.h

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#ifndef _PMINSERTER_H
#define _PMINSERTER_H

template<typename T>
class PMInserter
{
    public:
        PMInserter() {}

        virtual ~PMInserter() {}

        virtual void operator+=(T& elem) = 0;

        virtual bool empty() = 0;
};

template<typename Container, typename T>
class PMBackInserter : public PMInserter<T>
{
    private:
        Container& _container;

    public:
        PMBackInserter(Container& container) : PMInserter<T>(), _container(container) {}

        virtual ~PMBackInserter() {}

        virtual void operator+=(T& elem)
        {
            _container.push_back(elem);
        }

        virtual bool empty()
        {
            return _container.empty();
        }
};

#endif

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