Function operator++

extern/json/json.hpp:13156–13161

! @brief post-increment (it++) @pre The iterator is initialized; i.e. `m_object != nullptr`. */

    @pre The iterator is initialized; i.e. `m_object != nullptr`.
    */
    iter_impl operator++(int)& // NOLINT(cert-dcl21-cpp)
    {
        auto result = *this;
        ++(*this);
        return result;
    }

    /*!
    @brief pre-increment (++it)