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template <typename T, typename Promise>
class RecGenIterator
{
Promise *d_promise = 0;
public:
using Reference = std::conditional_t<std::is_reference_v<T>, T, T &>;
RecGenIterator() noexcept = default;
explicit RecGenIterator(Promise *promise) noexcept;
bool operator==(RecGenIterator const &other) const noexcept;
bool operator!=(RecGenIterator const &other) const noexcept;
RecGenIterator &operator++();
void operator++(int);
Reference operator*() const noexcept;
T *operator->() const noexcept;
};
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