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C++20 STL Cookbook

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Introduction

About This Course

New C++20 Features

Chapter Overview Format Text with the New Format Library Use Compile-Time Vectors and Strings with Constexpr Safely Compare Integers of Different Types Use the Spaceship Operator <=> for Three-Way Comparisons Easily Find Feature Test Macros with the <version> Header Create Safer Templates with Concepts and Constraints Avoid Re-Compiling Template Libraries with Modules Create Views into Containers with Ranges Quiz: C++20 Features

General STL Features

Chapter Overview Use the New Span Class to Make Our C-Arrays Safer Use Structured Binding to Return Multiple Values Initialize Variables within if and switch Statements Use Template Argument Deduction for Simplicity and Clarity Use If constexpr to Simplify Compile-Time Decisions Quiz: General STL Features Challenge: Make Our Code Safer and Easier to Read

STL Containers

Chapter Overview Use Uniform Erasure Functions to Delete Items from a Container Delete Items from an Unsorted Vector in Constant Time Access Vector Elements Directly and Safely Keep Vector Elements Sorted Efficiently Insert Elements into a Map Efficiently Modify the Keys of Map Items Use unordered_map with Custom Keys Use Set to Sort and Filter User Input A Simple RPN Calculator with Deque A Word Frequency Counter with Map Find Long Sentences with a Vector of Vectors A ToDo List Using Multimap Quiz: STL Containers Challenge: Let's Play with Containers

Compatible Iterators

Chapter Overview Iterators Are Fundamental Create an Iterable Range Make Our Iterators Compatible with STL Iterator Traits Use Iterator Adapters to Fill STL Containers Create a Generator as Iterators Use Reverse Iterator Adapters to Iterate Backward Iterate Objects of Unknown Length with a Sentinel Build a Zip Iterator Adapter Create a Random-Access Iterator Quiz: Compatible Iterators Challenge: Reverse Everything in a String

Lambda Expressions

Chapter Overview Lambda Expressions Use Lambdas for Scoped Reusable Code Use Lambdas as Predicates with the Algorithm Library Use std::function as a Polymorphic Wrapper Concatenate Lambdas with Recursion Combine Predicates with Logical Conjunction Call Multiple Lambdas with the Same Input Use Mapped Lambdas for a Jump Table Quiz: Lambda Expressions Challenge: Output with Lambda Expressions

STL Algorithms

Chapter Overview Copy from One Iterator to Another Join Container Elements into a String Sort Containers with std::sort()Modify Containers with std::transform Find Items in a Container Limit the Values of a Container to a Range with std::clamp Sample Data Sets with std::sample Generate Permutations of Data Sequences Merge Sorted Containers Quiz: STL Algorithms Challenge: Let's Dive into Algorithms

Strings, Streams, and Formatting

Chapter Overview Use string_view as a Lightweight String Object Concatenate Strings Transform Strings Format Text with C++20’s Format Library Trim Whitespace from Strings Read Strings from User Input Count Words in a File Initialize Complex Structures From File Input Customize a String Class With char_traits Parse Strings with Regular Expressions Quiz: Strings, Streams and Formatting Challenge: String With a Zero Space

Utility Classes

Chapter Overview Manage Optional Values with std::optional Use std::any for Type Safety Store Different Types with std::variant Time Events with std::chrono Use Fold Expressions for Variadic Tuples Manage Allocated Memory with std::unique_ptr Share Objects with std::shared_ptr Use Weak Pointers with Shared Objects Share Members of a Managed Object Compare Random Number Engines Compare Random Number Distribution Generators Quiz: Utility Classes Challenge: Let's Check Out the Type of Data

Concurrency and Parallelism

Chapter Overview Sleep for a Specific Amount of Time Use std::thread for Concurrency Use std::async for Concurrency Run STL Algorithms in Parallel with Execution Policies Share Data Safely with Mutex and Locks Share Flags and Values with std::atomic Initialize Threads with std::call_once Use std::condition_variable to Resolve the Producer-Consumer Quiz: Concurrency and Parallelism Challenge: Sleep in a Multithread Function Call

Using the File System

Chapter Overview

Specialize std::formatter for the Path Class

Use Manipulation Functions with Path

List Files in a Directory

Search Directories and Files With a Grep Utility

Rename Files with Regex and directory_iterator

Create a Disk Usage Counter

Quiz: Usage of the File System

Challenge: What's Inside a Path?

A Few More Ideas

Chapter Overview Create a Trie Class for Search Suggestions Implement Multiple Producers and Consumers Calculate the Error Sum of Two Vectors Build Our Own Algorithm: Split Leverage Existing Algorithms: Gather Remove Consecutive Whitespace Convert Numbers to Words Quiz: Trie, Gather Function, and White Space Removal Challenge: Remove Whatever is White!

Conclusion

Create a Disk Usage Counter

Learn to create a disk usage counter.

We'll cover the following

How to do it
How it works

This is a simple utility that totals the size of every file in a directory and its sub-directories. It runs on both POSIX/Unix and Windows file systems.

How to do it

This recipe is a utility to report the size of every file in a directory and its sub-directories, along with a total. We'll re-use some of the functions we've used elsewhere in this chapter:

We start with a few convenience aliases:

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