Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Rust - Ownership & Borrowing
Search
Arnaud
November 21, 2018
Programming
2
51
Rust - Ownership & Borrowing
Introduction to Rust ownership and borrowing concepts.
Arnaud
November 21, 2018
Tweet
Share
More Decks by Arnaud
See All by Arnaud
TLS 1.3 arrive!!! Et si on comprenait déjà ce que fait TLS 1.2 ?
alocquet
1
120
TLS 1.3 arrive!!! Et si on comprenait déjà ce que fait TLS 1.2 ?
alocquet
0
45
Serverless
alocquet
0
21
Other Decks in Programming
See All in Programming
スキーマ駆動開発による品質とスピードの両立 - 私達は何故、スキーマを書くのか
kentaroutakeda
0
180
AppRouter Panel Talk
yosuke_furukawa
PRO
1
450
Go製Webアプリケーションのエラーとの向き合い方大全、あるいはやっぱりスタックトレース欲しいやん / Kyoto.go #50
utgwkk
6
1.7k
Polars入門
daikikatsuragawa
1
160
AmperとFleetを使ったAndroidアプリ
yoppie
0
250
CA.swift19 恋するAIアプリ開発の裏側
oskmr
0
380
Tailwind CSSを本気でカスタマイズする方法
fsubal
14
5.5k
"config" ってなんだ? / What is "config"?
okashoi
0
250
Ruby GitHub Packages
bkuhlmann
0
640
大規模Reactアプリのリアーキテクチャ~8万行のTanStack Query移行の軌跡~
kj455
4
1k
SIMD Parallel Programming with the Vector API
josepaumard
0
220
Milestoner
bkuhlmann
1
410
Featured
See All Featured
How to name files
jennybc
65
93k
The World Runs on Bad Software
bkeepers
PRO
61
6.7k
ピンチをチャンスに:未来をつくるプロダクトロードマップ #pmconf2020
aki_iinuma
79
43k
Building Adaptive Systems
keathley
32
1.9k
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
eileencodes
7
1.3k
What's in a price? How to price your products and services
michaelherold
238
11k
Put a Button on it: Removing Barriers to Going Fast.
kastner
58
3.1k
Visualization
eitanlees
137
14k
Reflections from 52 weeks, 52 projects
jeffersonlam
345
19k
Keith and Marios Guide to Fast Websites
keithpitt
408
22k
Why Our Code Smells
bkeepers
PRO
331
56k
Git: the NoSQL Database
bkeepers
PRO
423
63k
Transcript
Rust Rust Onwership & Onwership & Borrowing Borrowing
Stack vs Heap Stack vs Heap Stack Stack fast automatically
desaclocated at scope end limited size pointers and primitives storage
Heap Heap slower manage memory allocation
Control vs Security Control vs Security Control : optimisation Security
: avoid memory allocation problems / memory leaks
Examples Examples allocating memory and never free it dangling pointers
keep a reference to freed memory have a reference to a moved variable (realloc) other problems...
Examples in C++ Examples in C++
Examples in C++ Examples in C++
Examples in C++ Examples in C++
Rust Rust manage desallocation at compile time avoid alias &
mutability at same time
Rust Rust Ownership Ownership
What happens when What happens when variable is copied variable
is copied primitives : stack copy others : "move" String example copy stack representation : pointer, length, capacity disable rst variable -> 'value used here after move'
Take Ownership Take Ownership copy variable into another variable pass
variable to function return variable from function
Keep Ownership after Keep Ownership after function call function call
send inputs as outputs
Clone Clone deep copy : stack + heap never done
automaticaly by rust done automaticaly by rust for Stack only data (@see Copy trait) : integers, boolean, oat, character, tuple of these types
Borrowing Borrowing Borrow a variable Keep ownership
: Reference : Reference
Borrowing : 2 ways Borrowing : 2 ways fn(val: &String)
no mutability any borrow as you want fn(val: &mut String) mutable other constraints
Mutable Reference Mutable Reference cannot make a mutable reference if
an immutable reference has been done
Mutable Reference Mutable Reference cannot make multiple mutables references avoid
data race
String case String case String : stored in the heap
&String : reference to a String &str : slice from a String &'static str : slice : stored in program
String case : &str String case : &str
world name value ptr len 5 index value 0 h
1 e 2 l 3 l 4 o 5 6 w 7 o 8 r 9 l 10 d s name value ptr len 11 capacity 11
String case String case as function parameter ? If we
don't need ownership -> &str fn example(value : &str) { println!(value); }
String case String case as function parameter ? If we
need owership -> String fn example($self, value : String) { self.value = value; }
String case String case &str : if the variable must
be used outside my struct/fn &str : if the variable should be large : avoid deep copy
Useful traits Useful traits Box : store data on the
heap Deref : &String -> &str Rc : data owned by multiple variable Mutex Into Cow
References References 2014 : Memory Safety in Rust : Intro
: String vs &str : https://www.youtube.com/watch? v=WQbg6ZMQJvQ http://intorust.com/ https://hermanradtke.com/2015/05/03/string-vs- str-in-rust-functions.html