Method reversed

tests/test_sequences_and_iterators.cpp:251–257

        }

        Sequence reversed() const {
            Sequence result(m_size);
            for (size_t i = 0; i < m_size; ++i) {
                result[m_size - i - 1] = m_data[i];
            }
            return result;
        }

        size_t size() const { return m_size; }