Book Image

Advanced C++

By : Gazihan Alankus, Olena Lizina, Rakesh Mane, Vivek Nagarajan, Brian Price
5 (1)
Book Image

Advanced C++

5 (1)
By: Gazihan Alankus, Olena Lizina, Rakesh Mane, Vivek Nagarajan, Brian Price

Overview of this book

C++ is one of the most widely used programming languages and is applied in a variety of domains, right from gaming to graphical user interface (GUI) programming and even operating systems. If you're looking to expand your career opportunities, mastering the advanced features of C++ is key. The book begins with advanced C++ concepts by helping you decipher the sophisticated C++ type system and understand how various stages of compilation convert source code to object code. You'll then learn how to recognize the tools that need to be used in order to control the flow of execution, capture data, and pass data around. By creating small models, you'll even discover how to use advanced lambdas and captures and express common API design patterns in C++. As you cover later chapters, you'll explore ways to optimize your code by learning about memory alignment, cache access, and the time a program takes to run. The concluding chapter will help you to maximize performance by understanding modern CPU branch prediction and how to make your code cache-friendly. By the end of this book, you'll have developed programming skills that will set you apart from other C++ programmers.
Table of Contents (11 chapters)
6. Streams and I/O

Function Objects and Lambda Expressions

One common pattern used in programming, particularly when implementing event-based processing, such as asynchronous input and output, is the use of the callback. A client registers that they want to be notified that an event has occurred (For example: data is available to read, or a data transmission is complete). This pattern is known as Observer pattern or Subscriber Publisher pattern. C++ supports a variety of techniques to provide the callback mechanism.

Function Pointers

The first mechanism is the use of the function pointers. This is a legacy feature inherited from the C language. The following program shows an example of a function pointer:

#include <iostream>

using FnPtr = void (*)(void);

void function1()


    std::cout << "function1 called\n";


int main()


    std::cout << "\n\n------ Function Pointers ------\n";

    FnPtr fn{function1};