What are the best practices for using templates in C++20?

What are the best practices for using templates in C++20?

In C++20, some best practices for using templates include using concepts for better type constraints, leveraging the new 'requires' clause, and avoiding template bloat by using template specialization judiciously.

Can you explain what concepts are and how they improve template usage?

Concepts are a way to specify constraints on template parameters, allowing you to define more readable and maintainable code. They help catch errors at compile time and improve code clarity.

What is the 'requires' clause and how does it work?

The 'requires' clause allows you to specify conditions that must be met for a template to be instantiated. It can be used in function templates and class templates to enforce constraints on types.

Are there any performance considerations I should be aware of?

Yes, while templates can lead to code bloat, C++20 introduces features like 'constexpr' and 'inline' variables that can help optimize performance. It's important to balance flexibility and efficiency.