Method iterator_range

paddle/utils/small_vector.h:53–55

  //      iterators.
  template <typename Container>
  explicit iterator_range(Container &&c)
      // TODO(others): Consider ADL/non-member begin/end calls.
      : begin_iterator(c.begin()), end_iterator(c.end()) {}
  iterator_range(IteratorT begin_iterator, IteratorT end_iterator)
      : begin_iterator(std::move(begin_iterator)),
        end_iterator(std::move(end_iterator)) {}