1 files changed, 48 insertions, 0 deletions
diff --git a/src/boost/libs/python/example/numpy/fromdata.cpp b/src/boost/libs/python/example/numpy/fromdata.cpp
new file mode 100644
index 000000000..bd073cc69
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+++ b/src/boost/libs/python/example/numpy/fromdata.cpp
@@ -0,0 +1,48 @@
+// Copyright Ankit Daftery 2011-2012.
+// Distributed under the Boost Software License, Version 1.0.
+//    (See accompanying file LICENSE_1_0.txt or copy at
+//          http://www.boost.org/LICENSE_1_0.txt)
+
+/**
+ *  @brief An example to show how to access data using raw pointers.  This shows that you can use and
+ *         manipulate data in either Python or C++ and have the changes reflected in both.
+ */
+
+#include <boost/python/numpy.hpp>
+#include <iostream>
+
+namespace p = boost::python;
+namespace np = boost::python::numpy;
+
+
+int main(int argc, char **argv)
+{
+  // Initialize the Python runtime.
+  Py_Initialize();
+  // Initialize NumPy
+  np::initialize();
+  // Create an array in C++
+  int arr[] = {1,2,3,4} ; 
+  // Create the ndarray in Python
+  np::ndarray py_array = np::from_data(arr, np::dtype::get_builtin<int>() , p::make_tuple(4), p::make_tuple(4), p::object());
+  // Print the ndarray that we just created, and the source C++ array
+  std::cout << "C++ array :" << std::endl ;
+  for (int j=0;j<4;j++)
+  {
+    std::cout << arr[j] << ' ' ;
+  }
+  std::cout << std::endl << "Python ndarray :" << p::extract<char const *>(p::str(py_array)) << std::endl;
+  // Change an element in the python ndarray
+  py_array[1] = 5 ; 
+  // And see if the C++ container is changed or not
+  std::cout << "Is the change reflected in the C++ array used to create the ndarray ? " << std::endl ; 
+  for (int j = 0;j<4 ; j++)
+  {
+    std::cout << arr[j] << ' ' ;
+  }
+  // Conversely, change it in C++
+  arr[2] = 8 ;
+  // And see if the changes are reflected in the Python ndarray
+  std::cout << std::endl << "Is the change reflected in the Python ndarray ?" << std::endl << p::extract<char const *>(p::str(py_array)) << std::endl;
+
+}