Section author: Andreas Dedner <a.s.dedner@warwick.ac.uk>, Robert Klöfkorn <robert dot klofkorn at math dot lu dot se>, Martin Nolte <nolte.mrtn@gmail.com>

Using C++ Code Snippets

In this section we demonstrate how it possible to use small pieces of C++ code to either extend the existing functionality or improve the efficiency of the code by moving code from Python to C++. We will first describe how to define grid functions based on some simple C++ code. We will then move parts of an algorithm from Python to C++. The DUNE interfaces exported to Python are very close to their C++ counterpart so that rapid prototyping of new algorithms can be carried out using Python and then easily moved to C++. This will be demonstrated in the following examples:

Debugging the C++ snippets is not always straightforward see the later section for some hints for developers

• C++ Based Grid Functions
• Sampling the Solution over a Line
• Mean Curvature Flow (revisited)
• Dual Weighted Reisdual Estimate (revisited)