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  • Book Overview & Buying C++20 STL Cookbook
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C++20 STL Cookbook

C++20 STL Cookbook

By : Bill Weinman
4.5 (10)
Buy this Book
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C++20 STL Cookbook

C++20 STL Cookbook

4.5 (10)
By: Bill Weinman
Buy this Book

Overview of this book

Fast, efficient, and flexible, the C++ programming language has come a long way and is used in every area of the industry to solve many problems. The latest version C++20 will see programmers change the way they code as it brings a whole array of features enabling the quick deployment of applications. This book will get you up and running with using the STL in the best way possible. Beginning with new language features in C++20, this book will help you understand the language's mechanics and library features and offer insights into how they work. Unlike other books, the C++20 STL Cookbook takes an implementation-specific, problem-solution approach that will help you overcome hurdles quickly. You'll learn core STL concepts, such as containers, algorithms, utility classes, lambda expressions, iterators, and more, while working on real-world recipes. This book is a reference guide for using the C++ STL with its latest capabilities and exploring the cutting-edge features in functional programming and lambda expressions. By the end of the book C++20 book, you'll be able to leverage the latest C++ features and save time and effort while solving tasks elegantly using the STL.
Table of Contents (13 chapters)
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Preface
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About this book
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Who this book is for
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What this book covers
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Conventions used
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Sections
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Get in touch
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Share Your Thoughts
1
Chaper 1: New C++20 Features
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Chaper 1: New C++20 Features
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Technical requirements
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Format text with the new format library
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Use compile-time vectors and strings with constexpr
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Safely compare integers of different types
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Use the "spaceship" operator <=> for three-way comparisons
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Easily find feature test macros with the header
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Create safer templates with concepts and constraints
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Avoid re-compiling template libraries with modules
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Create views into containers with ranges
Lock Free Chapter
2
Chapter 2: General STL Features
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Chapter 2: General STL Features
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Technical requirements
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Use the new span class to make your C-arrays safer
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Use structured binding to return multiple values
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Initialize variables within if and switch statements
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Use template argument deduction for simplicity and clarity
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Use if constexpr to simplify compile-time decisions
3
Chapter 3: STL Containers
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Chapter 3: STL Containers
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A quick overview of the STL container types
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Technical requirements
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Use uniform erasure functions to delete items from a container
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Delete items from an unsorted vector in constant time
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Access vector elements directly and safely
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Keep vector elements sorted
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Efficiently insert elements into a map
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Efficiently modify the keys of map items
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Use unordered_map with custom keys
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Use set to sort and filter user input
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A simple RPN calculator with deque
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A word frequency counter with map
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Find long sentences with a vector of vectors
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A ToDo list using multimap
4
Chapter 4: Compatible Iterators
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Chapter 4: Compatible Iterators
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Iterators are fundamental
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Technical requirements
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Create an iterable range
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Make your iterators compatible with STL iterator traits
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Use iterator adapters to fill STL containers
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Create a generator as iterators
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Use reverse iterator adapters to iterate backward
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Iterate objects of unknown length with a sentinel
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Build a zip iterator adapter
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Create a random-access iterator
5
Chapter 5: Lambda Expressions
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Chapter 5: Lambda Expressions
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Lambda expressions
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Technical requirements
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Use lambdas for scoped reusable code
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Use lambdas as predicates with the algorithm library
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Use std::function as a polymorphic wrapper
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Concatenate lambdas with recursion
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Combine predicates with logical conjunction
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Call multiple lambdas with the same input
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Use mapped lambdas for a jump table
6
Chapter 6: STL Algorithms
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Chapter 6: STL Algorithms
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Technical requirements
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Copy from one iterator to another
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Join container elements into a string
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Sort containers with std::sort
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Modify containers with std::transform
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Find items in a container
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Limit the values of a container to a range with std::clamp
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Sample data sets with std::sample
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Generate permutations of data sequences
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Merge sorted containers
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Chapter 7: Strings, Streams, and Formatting
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Chapter 7: Strings, Streams, and Formatting
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String formatting
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Technical requirements
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Use string_view as a lightweight string object
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Concatenate strings
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Transform strings
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Format text with C++20's format library
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Trim whitespace from strings
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Read strings from user input
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Count words in a file
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Initialize complex structures from file input
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Customize a string class with char_traits
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Parse strings with Regular Expressions
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Chapter 8: Utility Classes
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Chapter 8: Utility Classes
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Technical requirements
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Manage optional values with std::optional
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Use std::any for type safety
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Store different types with std::variant
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Time events with std::chrono
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Use fold expressions for variadic tuples
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Manage allocated memory with std::unique_ptr
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Share objects with std::shared_ptr
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Use weak pointers with shared objects
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Share members of a managed object
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Compare random number engines
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Compare random number distribution generators
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Chapter 9: Concurrency and Parallelism
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Chapter 9: Concurrency and Parallelism
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Technical requirements
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Sleep for a specific amount of time
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Use std::thread for concurrency
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Use std::async for concurrency
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Run STL algorithms in parallel with execution policies
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Share data safely with mutex and locks
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Share flags and values with std::atomic
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Initialize threads with std::call_once
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Use std::condition_variable to resolve the producer-consumer problem
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Implement multiple producers and consumers
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Chapter 10: Using the File System
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Chapter 10: Using the File System
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Technical requirements
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Specialize std::formatter for the path class
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Use manipulation functions with path
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List files in a directory
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Search directories and files with a grep utility
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Rename files with regex and directory_iterator
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Create a disk usage counter
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Chapter 11: A Few More Ideas
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Chapter 11: A Few More Ideas
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Technical requirement
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Create a trie class for search suggestions
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Calculate the error sum of two vectors
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Build your own algorithm: split
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Leverage existing algorithms: gather
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Remove consecutive whitespace
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Convert numbers to words
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Why subscribe?
12
Other Books You May Enjoy
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Other Books You May Enjoy
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Use compile-time vectors and strings with constexpr

C++20 allows the use of constexpr in several new contexts. This provides improved efficiency, in that these things may be evaluated at compile time, instead of run time.

How to do it…

The specification includes the ability to use string and vector objects in constexpr context. It's important to note that these objects may not themselves be declared constexpr, but they may be used in a compile-time context:

constexpr auto use_string() {
    string str{"string"};
    return str.size();
}

You can also use algorithms in constexpr context:

constexpr auto use_vector() {
    vector<int> vec{ 1, 2, 3, 4, 5};
    return accumulate(begin(vec), end(vec), 0);
}

The result of the accumulate algorithm is available at compile time and in constexpr context.

How it works…

The constexpr specifier declares...

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C++20 STL Cookbook
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