Book Image

C++20 STL Cookbook

By : Bill Weinman
Book Image

C++20 STL Cookbook

By: Bill Weinman

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)

Concatenate strings

There are several ways to concatenate strings in C++. In this recipe, we will look at the three most common: the string class operator+(), the string class append() function, and the ostringstream class operator<<(). New in C++20, we also have the format() function. Each of these has its advantages, disadvantages, and use cases.

How to do it…

In this recipe, we will examine ways to concatenate strings. We will then perform some benchmarks and consider the different use cases.

  • We'll start with a couple of std::string objects:
    string a{ "a" };
    string b{ "b" };

The string objects are constructed from literal C-strings.

The C-string constructor makes a copy of the literal string and uses the local copy as the underlying data for the string object.

  • Now, let's construct a new empty string object and concatenate a and b with a separator and a newline:
    string x{};
    x += a + ", " + b + &quot...