Chaper 1: New C++20 Features

This chapter concentrates on some of the more compelling features that C++20 adds to the STL. You can use some of these right away. Others may need to wait for implementation in your favorite compiler. But in the long run, I expect you'll want to know about most of these features.

There are a lot of new additions to the C++20 standard, far more than we could cover here. These are a few that I think will have long-term impact.

In this chapter we will cover the following recipes:

• 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

This chapter...