Зміст курсу

C++ Pointers and References

1. Pointers Fundamentals

Introduction to Pointer Assigning Addresses to Pointers Link Between Pointer and Variable Pointers Use Cases

2. Pointer Arithmetic

Introduction to Pointer Arithmetic Pointer Arithmetic Practice Arrays and Pointers Connection Array Pointer Arithmetic Practice

3. References Fundamentals

Introduction to References Reference Use Cases Rvalue and Lvalue References Reference vs Pointers

4. Dynamic Memory Allocation

Introduction to Memory Dynamic Allocation Dynamic Allocation of the Array Pointer to Pointer Dynamic Allocation Summary and Overview

C++ Pointers and References

Rvalue and Lvalue References

Concepts lvalue and rvalue are related to the classification of expressions.

lvalue (left value): is an expression that refers to an object with identifiable memory location. It represents an object that can be modified;
rvalue (right value): is an expression that represents a temporary or disposable value.

Temporary Values

A temporary value is a short-lived, intermediate result created during the evaluation of an expression. For example:

Temporary values are automatically managed by the compiler, and they exist for the duration of the expression or operation where they are created. After that, they are typically discarded, and the result is stored in the target variable or used as needed.

Move semantics

An rvalue reference is denoted by the double ampersand (&&).

The only difference between an lvalue and rvalue reference is that rvalue can be bound to a temporary object, whereas an lvalue reference cannot.

Click👇

Note
Using an rvalue reference in this context might not be very practical, as there is no benefit to using an rvalue reference for a simple literal

A combination of lvalue and rvalue references is used to support move semantics, allowing resources to be transferred from one object to another without unnecessary copying. Look at the example below:

But we don't need copies of a or b. We simply wanted to swap them. Let's try again.

main.cpp

std::move(): transforms an lvalue into an rvalue reference, enabling move semantics and the transfer or ownership without copying.

Note
We will go into detail about move semantics in the C++ OOP course since it's widely used in that context

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Зміст курсу

C++ Pointers and References

1. Pointers Fundamentals

Introduction to Pointer Assigning Addresses to Pointers Link Between Pointer and Variable Pointers Use Cases

2. Pointer Arithmetic

Introduction to Pointer Arithmetic Pointer Arithmetic Practice Arrays and Pointers Connection Array Pointer Arithmetic Practice

3. References Fundamentals

Introduction to References Reference Use Cases Rvalue and Lvalue References Reference vs Pointers

4. Dynamic Memory Allocation

Introduction to Memory Dynamic Allocation Dynamic Allocation of the Array Pointer to Pointer Dynamic Allocation Summary and Overview

C++ Pointers and References

Rvalue and Lvalue References

Concepts lvalue and rvalue are related to the classification of expressions.

lvalue (left value): is an expression that refers to an object with identifiable memory location. It represents an object that can be modified;
rvalue (right value): is an expression that represents a temporary or disposable value.

Temporary Values

A temporary value is a short-lived, intermediate result created during the evaluation of an expression. For example:

Move semantics

An rvalue reference is denoted by the double ampersand (&&).

The only difference between an lvalue and rvalue reference is that rvalue can be bound to a temporary object, whereas an lvalue reference cannot.

Click👇

Note
Using an rvalue reference in this context might not be very practical, as there is no benefit to using an rvalue reference for a simple literal

But we don't need copies of a or b. We simply wanted to swap them. Let's try again.

main.cpp

std::move(): transforms an lvalue into an rvalue reference, enabling move semantics and the transfer or ownership without copying.

Note
We will go into detail about move semantics in the C++ OOP course since it's widely used in that context

Все було зрозуміло?

Секція 3. Розділ 3