Rust lifetime with a vec! does not work as intended

Asked Feb 29 '16 at 06:45

Active Mar 03 '18 at 21:14

Viewed 56 times

I love rust and I want to master it, but I am having difficulties.

Surely its about lifetimes. I still have a hard time getting my head around it yet. I show you some code here. There you can see a struct which holds a borrowed array.

When creating the CTOR for that Canvas I fail in declaring the lifetime 'a the right way.

struct Canvas<'a>{ 
  width: i32,
  height: i32, 
  array: &'a Vec<char>
}

impl <'a>Canvas<'a>{
  fn new(width: i32, height: i32) -> Canvas<'a>{
    Canvas {
      width: width,
      height: height,
      array: &vec!['x'; (width*height) as usize]
  }
}

Error says:

Reference must be valid for the lifetime 'a as defined on the block at 9:49

I understand the problem here - but can't find any example how to do it right. I nearly put 'a on every position possible :D

Edit

It was mentioned that I should not put the array as reference into my struct - how should it look to be right?

edited Mar 03 '18 at 21:14

halfer

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asked Feb 29 '16 at 06:45

xetra11

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oh? ok - I'll take a look and remove if question git answered there! – xetra11 Feb 29 '16 at 07:24
You probably should put the vector into the struct, not only a reference. – starblue Feb 29 '16 at 07:39
can you syntactically show me what you mean? – xetra11 Feb 29 '16 at 08:10
@xetra11 `struct Canvas { width: i32, height: i32, array: Vec }`, something like this. – Vladimir Matveev Feb 29 '16 at 08:50

Rust lifetime with a vec! does not work as intended

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0 Answers0