In C, a “pointer to constant” refers to a situation where a pointer variable is declared to point to a constant value, meaning the value it points to cannot be modified through that pointer. This concept involves the use of the const keyword in the declaration. The following example will...
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In mathematics, the discrete Laplace operator is an analog of the continuous Laplace operator, defined so that it has meaning on a graph or a discrete grid. For the case of a finite-dimensional graph (having a finite number of edges and vertices), the discrete Laplace operator is more commo...
A difficulty with the syntax of pointers is that the same character has a third meaning: It is also used when accessing the pointee through the pointer. When it is written before the name of a pointer, it means the variable that the pointer is pointing at (i.e. the pointee): writeln(...
That, in turn, poses a problem of naming; a data structure built with pointers does not have a name of its own. Consequently, it can not be referred to as a whole. To solve the problem we propose to replace the concept of pointers and explicit dereferencing by a different meaning ...
Understanding the meaning of lvalues and rvalues has given me the chance to figure out several of the C++'s inner workings. C++11 pushes the limits of rvalues even further, by introducing the concept ofrvalue referencesandmove semantics, where — surprise! — rvalues too are modifiable. I wi...
Thevariable that stores the address of another variable(likefooin the previous example) is what in C++ is called apointer. Pointers are a very powerful feature of the language that has many uses in lower level programming. A bit later, we will see how to declare and use pointers. ...
In modern C++, the pointers we are talking about here are sometimes called “raw pointers” or “dumb pointers”, to help differentiate them from “smart pointers” that were introduced into the language more recently. We cover smart pointers inchapter 22. ...
We will look at the different ways we can combine the word 'const' with pointers and how that impacts the meaning and usage of the pointers as well as the data pointed at.
Theconstqualifier is often used with pointers. There are three types of declarationsconst type * var,type *const varandconst type *const var. The first declares thevarpointer to read-onlytypeobject, meaning that the object can’t be modified but the pointer itself can be. The second -varre...