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Mastering Rust

You're reading from   Mastering Rust Learn about memory safety, type system, concurrency, and the new features of Rust 2018 edition

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Product type Paperback
Published in Jan 2019
Publisher Packt
ISBN-13 9781789346572
Length 554 pages
Edition 2nd Edition
Languages
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Authors (2):
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Vesa Kaihlavirta Vesa Kaihlavirta
Author Profile Icon Vesa Kaihlavirta
Vesa Kaihlavirta
Rahul Sharma Rahul Sharma
Author Profile Icon Rahul Sharma
Rahul Sharma
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Toc

Table of Contents (19) Chapters Close

Preface 1. Getting Started with Rust FREE CHAPTER 2. Managing Projects with Cargo 3. Tests, Documentation, and Benchmarks 4. Types, Generics, and Traits 5. Memory Management and Safety 6. Error Handling 7. Advanced Concepts 8. Concurrency 9. Metaprogramming with Macros 10. Unsafe Rust and Foreign Function Interfaces 11. Logging 12. Network Programming in Rust 13. Building Web Applications with Rust 14. Interacting with Databases in Rust 15. Rust on the Web with WebAssembly 16. Building Desktop Applications with Rust 17. Debugging 18. Other Books You May Enjoy

Memory safety

But what do we mean by a program being memory safe? Memory safety is the idea that your program never touches a memory location it is not supposed to, and that the variables declared in your program cannot point to invalid memory and remain valid in all code paths. In other words, safety basically boils down to pointers having valid references all of the time in your program, and that the operations with pointers do not lead to undefined behavior. Undefined behavior is the state of a program where it has entered a situation that has not been accounted for in the compiler's because the compiler specification does not clarify what happens in that situation.

An example of undefined behavior in C is accessing out of bound and uninitialized array elements:

// uninitialized_reads.c

#include <stdio.h>
int main() {
int values[5];
for (int i = 0; i < 5...
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