Book Image

C++17 STL Cookbook

By : Jacek Galowicz
Book Image

C++17 STL Cookbook

By: Jacek Galowicz

Overview of this book

C++ has come a long way and is in use in every area of the industry. Fast, efficient, and flexible, it is used to solve many problems. The upcoming version of C++ will see programmers change the way they code. If you want to grasp the practical usefulness of the C++17 STL in order to write smarter, fully portable code, then this book is for you. Beginning with new language features, this book will help you understand the language’s mechanics and library features, and offers insight into how they work. Unlike other books, ours takes an implementation-specific, problem-solution approach that will help you quickly overcome hurdles. You will learn the core STL concepts, such as containers, algorithms, utility classes, lambda expressions, iterators, and more, while working on practical real-world recipes. These recipes will help you get the most from the STL and show you how to program in a better way. By the end of the book, you will be up to date with the latest C++17 features and save time and effort while solving tasks elegantly using the STL.
Table of Contents (18 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
Index

Implementing the producer/consumer idiom with std::condition_variable


In this recipe, we are going to implement a typical producer/consumer program with multiple threads. The general idea is that there is one thread that produces items and puts them into a queue. Then there is another thread that consumes such items. If there is nothing to produce, the producer thread sleeps. If there is no item in the queue to consume, the consumer sleeps.

Since the queue that both threads have access to is also modified by both whenever an item is produced or consumed, it needs to be protected by a mutex.

Another thing to consider is: What does the consumer do if there is no item in the queue? Does it poll the queue every second until it sees new items? That is not necessary because we can let the consumer wait for wakeup events that are triggered by the producer, whenever there are new items.

C++11 provides a nice data structure called std::condition_variable for this kind of events. In this recipe, we are...