BasicProducer.h

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#pragma once
 
namespace catapult { namespace handlers {
 
    template<typename TContainer>
    class BasicProducer {
    public:
        explicit BasicProducer(const TContainer& container)
                : m_container(container)
                , m_iter(m_container.cbegin())
        {}
 
    protected:
        template<typename TConverter>
        auto next(TConverter convert) {
            return m_container.cend() == m_iter ? nullptr : convert(*m_iter++);
        }
 
    private:
        const TContainer& m_container;
        decltype(TContainer().cbegin()) m_iter;
    };
}}