Book Image

Mastering Rust. - Second Edition

By : Rahul Sharma
Book Image

Mastering Rust. - Second Edition

By: Rahul Sharma

Overview of this book

Rust is an empowering language that provides a rare combination of safety, speed, and zero-cost abstractions. Mastering Rust – Second Edition is filled with clear and simple explanations of the language features along with real-world examples, showing you how you can build robust, scalable, and reliable programs. This second edition of the book improves upon the previous one and touches on all aspects that make Rust a great language. We have included the features from latest Rust 2018 edition such as the new module system, the smarter compiler, helpful error messages, and the stable procedural macros. You’ll learn how Rust can be used for systems programming, network programming, and even on the web. You’ll also learn techniques such as writing memory-safe code, building idiomatic Rust libraries, writing efficient asynchronous networking code, and advanced macros. The book contains a mix of theory and hands-on tasks so you acquire the skills as well as the knowledge, and it also provides exercises to hammer the concepts in. After reading this book, you will be able to implement Rust for your enterprise projects, write better tests and documentation, design for performance, and write idiomatic Rust code.
Table of Contents (19 chapters)

Calling Rust code from C

As we stated in the previous section, when Rust libraries expose their functions to other languages using the extern block, they expose the C ABI (cdecl) by default. As such, it becomes a very seamless experience of calling Rust code from C. To C, they appear just like regular C functions. We'll take a look at an example of calling Rust code from a C program. Let's create a cargo project for this by running cargo new rust_from_c --lib.

In our Cargo.toml file, we have the following items:

# rust_from_c/Cargo.toml

name = "rust_from_c"
version = "0.1.0"
authors = ["Rahul Sharma <[email protected]>"]
edition = "2018"

name = "stringutils"
crate-type = ["cdylib"]

Under the [lib] section, we specified the crate as cdylib, which indicates that we want a dynamically loadable...