Rust datatypes: Difference between revisions
From wikinotes
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</blockquote><!-- arrays --> | </blockquote><!-- arrays --> | ||
== structs == | |||
<blockquote> | |||
<syntaxhighlight lang="rust"> | |||
struct Person { name: String, age: u8 } // struct | |||
struct Unit // unit struct | |||
struct Color(i8, i8, i8); // tuple-struct | |||
</syntaxhighlight> | |||
</blockquote><!-- structs --> | |||
</blockquote><!-- Collections --> | </blockquote><!-- Collections --> |
Revision as of 02:57, 1 September 2021
Literals
'a' // char "abc" // string 1234 // i32 3.14 // f32 true/false // bool1_000 // == 1000 1.000_000 // == 1.000000
Primitives
Text
string
"abcd" // stringchar
char 'a' // character (single)Numbers
implied type let var = 12;
assigned type let var: i8 = 12;
type suffix let var = 12i8;
Integers
- signed integers range is split in two, can be positive/negative
- unsigned integers are positive, and use all available bits
- use radix to calculate max size that can be accomodated with b bits
// signed integers, by bit-size i8 // -128..127 i16 // -32768..32767 i32 // -2147483648..2147483647 i64 // ... i128 isize // unsigned integers, by bit-size u8 // 0..255 u16 // 0..65535 u36 // 0..4294967295 u64 // ... u128 usizeFloating Point
f32 f64Boolean
true false
Collections
tuples
- tuples are dynamically sized
- tuples can store mixed types
- tuples can contain other tuples
var = (1, "two", 3.14) var.0 // item at index 1arrays
- arrays are homogenous
- arrays have a predeterminted/fixed size
- arrays are stored contiguously in memory
// initialization let var: [i32; 4] = [1, 2, 3, 4]; // declare an array of 4x 32-bit integers let var: [i32; 4] = [100; 4]; // initialize all 4x ints as 100 // methods var[0] // 1 var.len() // 4 // slices let foo = &var[1..2]; // [2, 3] println!("{}", foo[0]); // 2structs
struct Person { name: String, age: u8 } // struct struct Unit // unit struct struct Color(i8, i8, i8); // tuple-struct