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| -rwxr-xr-x | vala.html.markdown | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/vala.html.markdown b/vala.html.markdown index b9ec558d..93ae6abd 100755 --- a/vala.html.markdown +++ b/vala.html.markdown @@ -425,7 +425,38 @@ class Computer<OperatingSystem> : GLib.Object { var new_computer = new Computer<Linux>(); +/* Other Features */ + +// Assertions: crash if a statement is not true (at runtime) + +bool is_true = true; +assert(is_true); + +// Contract Programming + +int contract_demo(int arg1, int arg2) { + requires(arg1 > 0 && arg1 < 10) // Notice the lack of semicolon + requires(arg2 >= 12) + ensures(result >= 0) +} + +// Error Handling + +void error_demo(int int_ex) throws GError { + if (int_ex != 1) { + throw new GError("TEST MESSAGE"); + } +} +void error_demo2() { + try { + error_demo(0); + } catch (GError ge) { + stdout.printf("%s\n", ge.message); + } +} + ``` * More Vala documentation can be found [here](https://valadoc.org/). * [Alternate construction syntax](https://wiki.gnome.org/Projects/Vala/Tutorial#GObject-Style_Construction) similar to GObject +* More on contract programming [here](http://en.wikipedia.org/wiki/Contract_programming) * Read about building GUIs with GTK+ and Vala [here](http://archive.is/7C7bw). |