RangeFeed.h

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#ifndef WIRECELL_RANGEFEED
#define WIRECELL_RANGEFEED

namespace WireCell {

    template <typename Iter>
    struct RangeFeed {
        typedef typename Iter::value_type value_type;
        Iter m_begin, m_end;
        RangeFeed(const Iter& begin, const Iter& end) : m_begin(begin), m_end(end) {}
        value_type operator()() {
            if (m_begin == m_end) {
                return nullptr;
            }
            value_type ret = *m_begin;
            ++m_begin;
            return ret;
        }
    };

}
#endif