C++ array::get_readwrite_originptr方法代码示例

void dynd::parse_json(nd::array &out, const char *json_begin,
                      const char *json_end, const eval::eval_context *ectx)
{
    try {
        const char *begin = json_begin, *end = json_end;
        ndt::type tp = out.get_type();
        ::parse_json(tp, out.get_ndo_meta(), out.get_readwrite_originptr(), begin, end, ectx);
        begin = skip_whitespace(begin, end);
        if (begin != end) {
            throw json_parse_error(begin, "unexpected trailing JSON text", tp);
        }
    } catch (const json_parse_error& e) {
        stringstream ss;
        string line_prev, line_cur;
        int line, column;
        get_error_line_column(json_begin, json_end, e.get_position(),
                        line_prev, line_cur, line, column);
        ss << "Error parsing JSON at line " << line << ", column " << column << "\n";
        if (e.get_type().get_type_id() != uninitialized_type_id) {
            ss << "DType: " << e.get_type() << "\n";
        }
        ss << "Message: " << e.get_message() << "\n";
        print_json_parse_error_marker(ss, line_prev, line_cur, line, column);
        throw runtime_error(ss.str());
    }
}

static void linspace_specialization(double start, double stop, intptr_t count, nd::array& result)
{
    intptr_t stride = result.get_strides()[0];
    char *dst = result.get_readwrite_originptr();
    for (intptr_t i = 0; i < count; ++i, dst += stride) {
        double val = ((count - i - 1) * start + i * stop) / double(count - 1);
        *reinterpret_cast<double *>(dst) = val;
    }
}

    // Constructor which creates the output based on the input's broadcast shape
    array_iter(const ndt::type& op0_dtype, nd::array& out_op0, const nd::array& op1, const nd::array& op2, const nd::array& op3) {
        create_broadcast_result(op0_dtype, op1, op2, op3, out_op0, m_iter_ndim[0], m_itershape);
        nd::array ops[4] = {out_op0, op1, op2, op3};
        m_array_tp[0] = out_op0.get_type();
        m_array_tp[1] = op1.get_type();
        m_array_tp[2] = op2.get_type();
        m_array_tp[3] = op3.get_type();
        m_itersize = 1;
        m_iter_ndim[1] = m_array_tp[1].get_ndim();
        m_iter_ndim[2] = m_array_tp[2].get_ndim();
        m_iter_ndim[3] = m_array_tp[3].get_ndim();
        // Allocate and initialize the iterdata
        if (m_iter_ndim[0] != 0) {
            m_iterindex.init(m_iter_ndim[0]);
            memset(m_iterindex.get(), 0, sizeof(intptr_t) * m_iter_ndim[0]);
            // The destination iterdata
            size_t iterdata_size = m_array_tp[0].get_iterdata_size(m_iter_ndim[0]);
            m_iterdata[0] = reinterpret_cast<iterdata_common *>(malloc(iterdata_size));
            if (!m_iterdata[0]) {
                throw std::bad_alloc();
            }
            m_metadata[0] = out_op0.get_ndo_meta();
            m_array_tp[0].iterdata_construct(m_iterdata[0],
                            &m_metadata[0], m_iter_ndim[0], m_itershape.get(), m_uniform_tp[0]);
            m_data[0] = m_iterdata[0]->reset(m_iterdata[0], out_op0.get_readwrite_originptr(), m_iter_ndim[0]);
            // The op iterdata
            for (int i = 1; i < 4; ++i) {
                iterdata_size = m_array_tp[i].get_broadcasted_iterdata_size(m_iter_ndim[i]);
                m_iterdata[i] = reinterpret_cast<iterdata_common *>(malloc(iterdata_size));
                if (!m_iterdata[i]) {
                    throw std::bad_alloc();
                }
                m_metadata[i] = ops[i].get_ndo_meta();
                m_array_tp[i].broadcasted_iterdata_construct(m_iterdata[i],
                                &m_metadata[i], m_iter_ndim[i],
                                m_itershape.get() + (m_iter_ndim[0] - m_iter_ndim[i]), m_uniform_tp[i]);
                m_data[i] = m_iterdata[i]->reset(m_iterdata[i], ops[i].get_ndo()->m_data_pointer, m_iter_ndim[0]);
            }

            for (size_t i = 0, i_end = m_iter_ndim[0]; i != i_end; ++i) {
                m_itersize *= m_itershape[i];
            }
        } else {
            for (size_t i = 0; i < 4; ++i) {
                m_iterdata[i] = NULL;
                m_uniform_tp[i] = m_array_tp[i];
                m_data[i] = ops[i].get_ndo()->m_data_pointer;
                m_metadata[i] = ops[i].get_ndo_meta();
            }
        }
    }

/**
 * Given a buffer array of type "strided * T" which was
 * created by nd::empty, resets it so it can be used
 * as a buffer again.
 *
 * NOTE: If the array is not of type "strided * T" and default
 *       initialized by nd::empty, undefined behavior will result.
 * 
 */
inline void reset_strided_buffer_array(const nd::array& buf)
{
  const ndt::type &buf_tp = buf.get_type();
  base_type_members::flags_type flags = buf_tp.extended()->get_flags();
  if (flags &
      (type_flag_blockref | type_flag_zeroinit | type_flag_destructor)) {
    char *buf_arrmeta = buf.get_ndo()->get_arrmeta();
    char *buf_data = buf.get_readwrite_originptr();
    buf_tp.extended()->arrmeta_reset_buffers(buf.get_ndo()->get_arrmeta());
    strided_dim_type_arrmeta *am =
        reinterpret_cast<strided_dim_type_arrmeta *>(buf_arrmeta);
    if (flags & type_flag_destructor) {
      buf_tp.extended()->data_destruct(buf_arrmeta, buf_data);
    }
    memset(buf_data, 0, am->dim_size * am->stride);
  }
}

 array_iter(const nd::array& op0) {
     init(op0.get_type(), op0.get_ndo_meta(), op0.get_readwrite_originptr());
 }