Interfaces give a lot of support for OO-design in a language. Obviously, they can be done in C, but it takes a fair amount of writing "boring" code to do it. This gives an example of how it can be done using the c_intf_gen.py Python script to remove a lot of that "boring" code.
This example implements the GoF's Abstract Factory design pattern.
The interface structure is given via the description file abs_factory_def.txt. Basically the gui_factory interface has a create_button function and is implemented by both the win_factory and osx_factory classes. The button interface has a paint function and is implemented by both the win_button and osx_button classes.
In generate_gui in test_abs_factory.c, we specify a way of building GUIs that create buttons and is OS-indepenent. This same method of constructing GUIs can then be shared by different OS-specific GUI factories that create their own widgets.
The files follow the convention:
my_class.my_class. Should only be included by classes that implement from my_class.my_class and includes private data not directly accessible by even friend classes.Assuming your c_intf_gen.py script is in the parent directory (if not, the GEN_SCRIPT variable in the Makefile can be modified), just do:
make all
./test_abs_factory
You can edit test_abs_factory.c to try various things with this class hierarchy. Running make clean will remove the executable, object, and generated files.
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>.
1.7.4