Learn Rust in a Month of Lunches

21 Continuing the tour

This chapter covers

• The mem module
• The std library prelude
• Setting panic hooks and viewing backtraces
• Other macros

This is the second of two chapters touring the standard library, with a lot of new (but not difficult) types that you’ll find useful to know. Near the end, we will look at some macros we haven’t encountered before, which will lead into the next chapter, where you will learn how to write your own!

21.1 std::mem

As the name implies, the std::mem module has types and functions for dealing with memory. The functions inside this module are particularly interesting (and convenient). We have seen some of them already, such as size_of(), size_of_val(), and drop():

use std::mem;
 
fn main() {
 println!("Size of an ...