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
74
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
56
Serverless
alocquet
0
28
Other Decks in Programming
See All in Programming
PHPに関数型の魂を宿す〜PHP 8.5 で実現する堅牢なコードとは〜 #phpcon_hiroshima / phpcon-hiroshima-2025
shogogg
1
330
技術的負債の正体を知って向き合う
irof
0
250
React Nativeならぬ"Vue Native"が実現するかも?_新世代マルチプラットフォーム開発フレームワークのLynxとLynxのVue.js対応を追ってみよう_Vue Lynx
yut0naga1_fa
2
930
AIと人間の共創開発!OSSで試行錯誤した開発スタイル
mae616
2
800
Claude CodeによるAI駆動開発の実践 〜そこから見えてきたこれからのプログラミング〜
iriikeita
0
330
ソフトウェア設計の実践的な考え方
masuda220
PRO
4
650
ALL CODE BASE ARE BELONG TO STUDY
uzulla
28
6.7k
Introduce Hono CLI
yusukebe
6
3.1k
NixOS + Kubernetesで構築する自宅サーバーのすべて
ichi_h3
0
1.2k
他言語経験者が Golangci-lint を最初のコーディングメンターにした話 / How Golangci-lint Became My First Coding Mentor: A Story from a Polyglot Programmer
uma31
0
380
Software Architecture
hschwentner
6
2.3k
『毎日の移動』を支えるGoバックエンド内製開発
yutautsugi
2
290
Featured
See All Featured
jQuery: Nuts, Bolts and Bling
dougneiner
65
7.9k
Scaling GitHub
holman
463
140k
Build The Right Thing And Hit Your Dates
maggiecrowley
38
2.9k
GraphQLの誤解/rethinking-graphql
sonatard
73
11k
Fantastic passwords and where to find them - at NoRuKo
philnash
52
3.5k
Writing Fast Ruby
sferik
630
62k
Documentation Writing (for coders)
carmenintech
75
5.1k
Mobile First: as difficult as doing things right
swwweet
225
10k
The Pragmatic Product Professional
lauravandoore
36
7k
Reflections from 52 weeks, 52 projects
jeffersonlam
353
21k
How to Think Like a Performance Engineer
csswizardry
27
2.1k
Embracing the Ebb and Flow
colly
88
4.9k
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