OOP Using GObject (5) – Private Members

Here’s some trivial note on using GObject library.

1. Private members

Recall our definition of Base type:

NOTE: PLEASE READ ALL COMMENT CAREFULLY.

It expose the visibility of base_instance_i field. We should keep encapsulation in OOP. GObject library has support for this. We can define the class as:

We declare a new FakeBasePrivate struct to contain all private field used in FakeBase type. And the private struct is defined in *.c file, so its internal representation remains invisible. Then in *.c file, we got:

The private member is malloc in class_init() callback, and is ready to use after invoking instance_init(). When we will use property mechanism to get/set these private field later.

2. Naming convention

Official document: http://library.gnome.org/devel/gobject/stable/gtype-conventions.html. Just follow it to make your code more readable.

All source code is available in my skydrive: http://cid-481cbe104492a3af.office.live.com/browse.aspx/share/dev/TestOO. In the TestGObject-{date}.zip/TestGObject5 folder.

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