counting_input.h

// Description: Counting input
// Documentation: input.txt

#ifndef PASTELSYS_COUNTING_INPUT_H
#define PASTELSYS_COUNTING_INPUT_H

#include "pastel/sys/input/input_concept.h"

namespace Pastel
{

    template <typename Incrementable>
    class Counting_Input
    {
    public:
        Counting_Input()
        : i_()
        , end_()
        {
        }

        explicit Counting_Input(
            const Incrementable& begin,
            const Incrementable& end)
        : i_(begin)
        , end_(end)
        {
        }

        integer nHint() const
        {
            return 0;
        }

        bool empty() const
        {
            return i_ == end_;
        }

        const Incrementable& get() const
        {
            PENSURE(!empty());
            return i_;
        }

        void pop()
        {
            PENSURE(!empty());
            ++i_;
        }

    private:
        Incrementable i_;
        Incrementable end_;
    };

    template <typename Incrementable = integer>
    Counting_Input<Incrementable> countingInput(
        const Incrementable& begin,
        const Incrementable& end)
    {
        return Counting_Input<Incrementable>(begin, end);
    }

}

#endif