Programming with Rust

21

Macros

Never limit yourself because of others’ limited imagination.

— Mae Jemison

The use of macros allows you to reimagine Rust within the context of your own aspirations. Rust’s support of macros is a powerful feature that provides almost unlimited capabilities. You can provide new features, implement default behavior, or simply avoid redundancy.

The println! macro is probably the most well-known macro in the Rust universe. It provides the capability of a variadic function. This is because Rust does not support variadic functions. Therefore, the println! macro provides a feature not available in the standard language. A close second in popularity is the derive attribute. The derive attribute for the Clone and Copy traits, for example, is ...