From 6e619efc75e121e72fb3a6c0ad837a4f60d13481 Mon Sep 17 00:00:00 2001
From: Gergely Polonkai <gergely@polonkai.eu>
Date: Fri, 26 Feb 2016 15:24:32 +0100
Subject: [PATCH] Add post about Vala interfaces

---
 _posts/2016-02-26-vala-interface-madness.md | 33 +++++++++++++++++++++
 blog/tag/vala.html                          |  4 +++
 2 files changed, 37 insertions(+)
 create mode 100644 _posts/2016-02-26-vala-interface-madness.md
 create mode 100644 blog/tag/vala.html

diff --git a/_posts/2016-02-26-vala-interface-madness.md b/_posts/2016-02-26-vala-interface-madness.md
new file mode 100644
index 0000000..609b043
--- /dev/null
+++ b/_posts/2016-02-26-vala-interface-madness.md
@@ -0,0 +1,33 @@
+---
+layout:    post
+title:     "Vala interface madness"
+date:      2016-02-26 15:07:62+02:00
+tags:      [vala, development]
+published: true
+author:
+  name: "Gergely Polonkai"
+  email: "gergely@polonkai.eu"
+---
+
+Although I have just started making it in C, I decided to move my
+Matrix GLib SDK to Vala. First to learn a new language, and second
+because it is much easier to write GObject based stuff with it.
+
+For the first step I created a `.vapi` file from my existing sources,
+so the whole SDK prototype was available for me in Vala.
+
+I had a `MatrixEvent` class that implemented the `GInitable`
+interface, and many others were subclassed `MatrixEvent`. For some
+reason I don’t remember, I created the following header for one of the
+event classes:
+
+    public class MatrixPresenceEvent : GLib.Object, GLib.Initable {
+
+This is nice and everything, but as I didn’t create an `init()` method
+for `MatrixPresenceEvent`, it tried to use the one from the parent
+class and somehow got into an infinite loop. The Vala transformer
+(`valac`), however, doesn’t mention this.
+
+Lessons learned: if you implement an interface on a subclass that is
+implemented by the parent don’t forget to add the necessary functions
+to the subclass.
diff --git a/blog/tag/vala.html b/blog/tag/vala.html
new file mode 100644
index 0000000..49785cf
--- /dev/null
+++ b/blog/tag/vala.html
@@ -0,0 +1,4 @@
+---
+layout: posts-by-tag
+tag:    vala
+---