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Published in:
Introduction Read chapter Read first chapter

2019 | OriginalPaper | Chapter

4. Object-Oriented Programming

Author : Michael Lauer

Published in: Introducing Vala Programming

Publisher: Apress

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Abstract

This chapter goes into the details of object-oriented programming, which is the central programming paradigm of Vala, including classes, interfaces, polymorphism, and the signal mechanism for the loose binding of components.

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Footnotes
1
This boils down to the difference of glib’s static and fundamental type concept. Classes derived from GLib.Object are registered with g_type_register_static(), others are registered with g_type_register_fundamental().
 
2
An indicator of an upcoming problem is the triggered compiler warning “warning: Two.doit hides inherited method One.doit. Use the new keyword if hiding was intentional.” Following this advice won’t solve the mentioned problem though.
 
3
If you’re not interested in the actual sender, you can leave out this parameter in the signal handler. You may also omit any number of trailing parameters. You can even connect signal handlers not taking any parameters, independent of the actual signal signature.
 
4
Unfortunately, just emitting a warning here is not quite helpful, since (a) you can’t catch the warning and (b) the assignment still “works.” It would have been better to set the variable to null, if the dynamic type cast fails.
 
Metadata
Title
Object-Oriented Programming
Author
Michael Lauer
Copyright Year
2019
Publisher
Apress
Book
Introducing Vala Programming

Print ISBN: 978-1-4842-5379-3

Electronic ISBN: 978-1-4842-5380-9

Copyright Year: 2019

DOI
https://doi.org/10.1007/978-1-4842-5380-9_4

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