V (programming language): Difference between revisions

Revision as of 11:01, 23 August 2025

Revision as of 15:57, 23 August 2025

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=== Structs ===

{{Copyvio|timestamp=20250715164557 |url=https://docs.vlang.io/structs.html}}

Struct example:<ref name="Knott"/><ref name="section"/>

<syntaxhighlight lang="Vv">

struct PlaceFoobar {

a number int

name string

b int

score f32

}

// Struct fields can be initialized by name

mut p := Place {

var1 := Foobar {

a: 15

number: 21

b: 25

name: "baz"

score: 2.5

}

println(p.a) // A dot is used to access struct fields

// or by position

// Alternative literal syntax can be used

pvar2 := PlaceFoobar {1550, "qux", 253.14}

assert p.a == 15

</syntaxhighlight>

</div>

=== Heap structs ===

{{Copyvio|timestamp=20250715164557 |url=https://docs.vlang.io/structs.html#heap-structs}}

Structs that are allocatedreferenced onor have the stackheap byattribute default. The {{code|&}} prefix canwill be used, for getting a referenceallocated to itthe andheap allocatinginstead onof the heap insteadstack:{{sfn|Rao|2021}}

<syntaxhighlight lang="Vv">

struct PlaceFoo {

a number int

b int

}

@[heap]

p := &Place{30, 30}

struct Bar {

// References use the same syntax to access fields

number f32

println(p.a)

}

// Structs that are referenced are heap allocated

var1 := &Foo {2}

// Bar is always heap allocated because of its [heap] attribute

var2 := Bar{4.5}

</syntaxhighlight>

</div>

=== Methods ===