* pass matrices by reference * suppress that * destructor * that's wrong, suppress it old-commit-hash: 4096f86e210e7caa94e7be2edfd1eb2c247175e8
* pass matrices by reference * suppress that * destructor * that's wrong, suppress it old-commit-hash: 4096f86e210e7caa94e7be2edfd1eb2c247175e8