Class GeneratorWrapper

tutorials/external/catch.hpp:3570–3582

    template <typename T>
    class GeneratorWrapper final {
        std::unique_ptr<IGenerator<T>> m_generator;
    public:
        GeneratorWrapper(std::unique_ptr<IGenerator<T>> generator):
            m_generator(std::move(generator))
        {}
        T const& get() const {
            return m_generator->get();
        }
        bool next() {
            return m_generator->next();
        }
    };

    template <typename T>
    GeneratorWrapper<T> value(T&& value) {