ChunkReader
===========

.. cpp:class:: numpy::ChunkReader

   numpy C++ class.

Example
-------

.. code-block:: cpp

   #include <numpy/np_ndarray.h>
   using namespace numpy;

   // Use ChunkReader
   ChunkReader obj;
   // ... operations ...

Other Methods
-------------

.. list-table::
   :widths: 40 20 15 25
   :header-rows: 1

   * - Signature
     - Return Type
     - Location
     - Example
   * - ``ChunkReader(const std::string& filename) : file(filename, std::ios::binary), has_value(false)``
     - ChunkReader(const std::string& filename) : file(filename, std::ios::binary),
     - np_sorting_algorithms.h:1780
     - :ref:`View <example-chunkreader-has_value-0>`
   * - ``void read_next()``
     - void
     - np_sorting_algorithms.h:1784
     - 


Code Examples
-------------

The following examples are extracted from the test suite.

.. _example-chunkreader-has_value-0:

.. dropdown:: has_value (np_test_5_all.cpp:11406)
   :class-title: example-dropdown

   .. code-block:: cpp
      :linenos:
      :lineno-start: 11396
      :emphasize-lines: 11

      
            // Test nditer_reduce (sum)
            double sum = numpy::nditer_reduce(arr, [](double acc, double val) {
              return acc + val;
              }, 0.0);
      
            if (std::abs(sum - 21.0) > 1e-10) {  // 1+2+3+4+5+6 = 21
              std::cout << "  [FAIL] : in np_test_functional_iteration() : nditer_reduce sum wrong";
              throw std::runtime_error("np_test_functional_iteration failed");
            }
      
            // Test nditer_find
            auto result = numpy::nditer_find(arr, [](double val) { return val > 3.5; });
            if (!result.has_value() || result.value().second != 4.0) {
              std::cout << "  [FAIL] : in np_test_functional_iteration() : nditer_find failed";
              throw std::runtime_error("np_test_functional_iteration failed");
            }
      
            // Test nditer_count
            size_t count = numpy::nditer_count(arr, [](double val) { return val > 2.0; });
            if (count != 4) {  // 3, 4, 5, 6