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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
commit | 19fcec84d8d7d21e796c7624e521b60d28ee21ed (patch) | |
tree | 42d26aa27d1e3f7c0b8bd3fd14e7d7082f5008dc /src/boost/libs/python/example/numpy/fromdata.cpp | |
parent | Initial commit. (diff) | |
download | ceph-19fcec84d8d7d21e796c7624e521b60d28ee21ed.tar.xz ceph-19fcec84d8d7d21e796c7624e521b60d28ee21ed.zip |
Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/boost/libs/python/example/numpy/fromdata.cpp')
-rw-r--r-- | src/boost/libs/python/example/numpy/fromdata.cpp | 48 |
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 --- /dev/null +++ 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; + +} |