Rust for Rustaceans

2 Types

Now that the fundamentals are out of the way, we’ll look at Rust’s type system. We’ll skip past the basics covered in The Rust Programming Language and instead dive headfirst into how different types are laid out in memory, the ins and outs of traits and trait bounds, existential types, and the rules for using types across crate boundaries.

Types in Memory

Every Rust value has a type. Types serve many purposes in Rust, as we’ll see in this chapter, but one of their most fundamental roles is to tell you how to interpret bits of memory. For example, the sequence of bits 0b10111101 (written in hexadecimal notation as 0xBD) does not ...