Book Image

C++ High Performance - Second Edition

By : Björn Andrist, Viktor Sehr
5 (2)
Book Image

C++ High Performance - Second Edition

5 (2)
By: Björn Andrist, Viktor Sehr

Overview of this book

C++ High Performance, Second Edition guides you through optimizing the performance of your C++ apps. This allows them to run faster and consume fewer resources on the device they're running on without compromising the readability of your codebase. The book begins by introducing the C++ language and some of its modern concepts in brief. Once you are familiar with the fundamentals, you will be ready to measure, identify, and eradicate bottlenecks in your C++ codebase. By following this process, you will gradually improve your style of writing code. The book then explores data structure optimization, memory management, and how it can be used efficiently concerning CPU caches. After laying the foundation, the book trains you to leverage algorithms, ranges, and containers from the standard library to achieve faster execution, write readable code, and use customized iterators. It provides hands-on examples of C++ metaprogramming, coroutines, reflection to reduce boilerplate code, proxy objects to perform optimizations under the hood, concurrent programming, and lock-free data structures. The book concludes with an overview of parallel algorithms. By the end of this book, you will have the ability to use every tool as needed to boost the efficiency of your C++ projects.
Table of Contents (17 chapters)
15
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16
Index

Representing optional values with std::optional

Although quite a minor feature from C++17, std::optional is a nice addition to the standard library. It simplifies a common case that couldn't be expressed in a clean and straightforward way prior to std::optional. In a nutshell, it is a small wrapper for any type where the wrapped type can be either initialized or uninitialized.

To put it in C++ lingo, std::optional is a stack-allocated container with a max size of one.

Optional return values

Before the introduction of std::optional, there was no clear way to define functions that may not return a defined value, such as the intersection point of two line segments. With the introduction of std::optional, such optional return values can be clearly expressed. What follows is an implementation of a function that returns an optional intersection between two lines:

// Prerequisite
struct Point { /* ......