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This post is auto-generated from RSS feed The Rust Programming Language Forum - Latest topics. Source: Lifetime issue with buffer when creating structure

Hello! I am trying to work with softbuffer and faced this wierd lifetime issue when I tried creating separate struct for Buffer and Window:

se std::{num::NonZeroU32, sync::Arc};

use winit::window::Window;

type Surface = softbuffer::Surface<Arc<Window>, Arc<Window>>;

type Buffer<'a> = softbuffer::Buffer<'a, Arc<Window>, Arc<Window>>;

struct Canvas<'a> {
    surface: Surface,
    window: Window,
    buffer: Option<Buffer<'a>>
}

impl<'a> Canvas<'a> {
    fn new(surface: Surface, window: Window) -> Self {
        Self { surface, window, buffer: None }
    }

    fn update(&mut self) {
        let width = self.window.inner_size().width;
        let height = self.window.inner_size().height;
        self.surface.resize(NonZeroU32::new(width).expect("Window size must be positive!"), NonZeroU32::new(height).expect("WIndow size must be positive!"));
        let buffer: = self.surface.buffer_mut().expect("Failed creating framebuffer");
        self.buffer = Some(buffer);
    }
}

But compiler says:

[rustc] lifetime may not live long enough assignment requires that `'1` must outlive `'a` [:20] let's call the lifetime of this reference `'1` [:15] lifetime `'a` defined here

I am confused because I can get Buffer and use it in code as long as I don’t drop surface, but I cannot add it to struct which will hold it some time till it will be replaced with next update().

Can someone please explain what am I doing wrong?

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