eval-set-object

Evaluate a Python script that modifies a C++ object

Create two C++ objects foo_1 and foo_2 of type Foo and pass them to a Python script (defined as a string in the C++ code):

• the first object is passed by value,
• the second one by reference.

The Python script modifies both values and the C++ code then checks that the first object has not changed but the second has.

$ mkdir build
$ cd build
$ cmake ..
$ make
$ ./scripting

The output from the Python script shows that the bar in foo_copy initially has the value 1, but then gets the value 5.

Outside of the script, back in the C++ code, the two asserts confirm that the bar in foo_1 (passted by copy) still has the value 1 and the one in foo_2 is now 5.

References

see http://pybind11.readthedocs.io/en/master/advanced/embedding.html