What is the sizeof operator?
The sizeof operator, returns the size of an expression, or of an object type in C. An expression is for example 1 + 2, an object is any region of memory, and a … Read More
Tag: tutorial
ARM processor modes
Let us start by first asking the question, of why do we need, the processor modes. Well simply put, a processor mode, is used to define a capability, so for example, the kind of features, instructions, or registers which … Read More
What is core foundation?
A little bit of history
To understand what core foundation is, let us get back in history a little bit. It was the year 2000, and there were two ways to develop applications, for macOS 10.
On one hand, … Read More
What is NSObject ?
Many object oriented programming languages, have a class, from which all other classes extends.
In general, a class has a set of methods, and variables, which it defines. The variables being the data, and the methods, being the … Read More
How to list windows, and their information, under Microsoft windows, Linux and macOS
A window is just a place, where an application can do its drawing, like drawing a button, text or other stuff.
For Linux
On Linux or UNIX like systems, there is a tool called xwininfo, which can be … Read More
What is a property in X11?
In X11, a property simply has a name, a type, a format, a value, and is associated with a window.
There is a set of functions, provided by X11, which allows manipulating a property, and they … Read More
What is an atom in X11?
An atom in X11, is of type Atom, which is defined in the <X11/Xatom.h header, as :
typedef unsigned long Atom; /* Also in Xdefs.h */
An atom is 32 bits, the reason, that long was chosen, … Read More
xset a tutorial
xset is a tool, which allows specifying certain configuration, for the X11 server. Mainly these configuration, are related to hardware, that the X11 server interacts with, so the keyboard, the mouse, the display, this being said, the display power … Read More
C++ integer types a tutorial !
The integer types in C++ are fundamental types . A fundamental type , has a mapping to hardware , so the operations performed on a fundamental type , are hardware performed .
Boolean , Characters , and integer types … Read More
Characters in lisp a tutorial
Character repertoires in lisp
A character repertoire such as ascii , or Latin alphabet 1 , or unicode , is a set of characters .
Each character , such as a , in a repertoire , is assigned a … Read More