How to initialize a reference field without a value?

Question

If I have structs A and B:

struct B {}

struct A<'a> {
  id: i32,
  b: &'a B
}

impl A<'_> {
  fn new() -> A {
    id: 3,
    b: // I have no B at the moment, how to create a A without B?
  }
}

I would like to create A, then assign &B to it later.

When a field's value is optional, use an [`Option`](https://doc.rust-lang.org/std/option/index.html). — Denys Séguret, Dec 16 '21 at 15:56

score 2 · Accepted Answer · answered Dec 16 '21 at 15:57

2

Why not use Option? Rust doesn't have null, thankfully.

answered Dec 16 '21 at 15:57

Riwen

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How to initialize a reference field without a value?

1 Answers1