I have a function that gets the dimensions of an image, and in different scenarios, I would it to be cast from a u32 to another number type suchas usize, i32, etc. However, when I try to do the following in get_dimensions it doesn’t work. Is something like this possible? I looked at How do I convert between numeric types safely and idiomatically? but in that example it uses an explicit type such as i32::from(...) whereas I would hopefully like to use a dynamic type.

Rust Playground Example

struct Example {
    width: u32,
    height: u32
}

impl Example {
    pub fn get_dimensions<T>(&self) -> (T, T)
    where
        T: From<u32>,
    {
        (T::from(self.width), T::from(self.height))
    }
}

pub fn main() {
    let example = Example { width: 800, height: 600 };
    let dimensions = example.get_dimensions::<usize>();
    println!("{dimensions}");
}

The error message I receive:

the trait bound `usize: From<u32>` is not satisfied
the following other types implement trait `From<T>`:
  `usize` implements `From<bool>`
  `usize` implements `From<std::ptr::Alignment>`
  `usize` implements `From<u16>`
  `usize` implements `From<u8>`