struct-initializers.md

Struct Initializers

Structs have initializers similar to classes, however there is no base initializer to call. The initializer still has two phases and enforces definite assignment of fields before the self value can be used.

public drop struct Example
{
    public init(mut self)
    {
    }

    public init named(mut self)
    {
    }
}

let x = Example();
let y = Example.named();

Default Initializers

A struct without any initializers will have a default initializer generated for it.

Field Initialization Shorthand

Just like class initializers, there is a shorthand for initializing fields.

public init(mut self, .field)
{
}

Definite Assignment

Like class initializers, definite assignment of fields is enforced. Since a struct never has a base class, the transition point to fully initialized is always implicit.