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use std::ops::Index;
pub trait Array2D: Index<usize> + Sized {
fn rows(&self) -> usize;
fn columns(&self) -> usize;
fn get<'a>(&'a self, y: usize, x: usize) -> Option<&'a <Self as Index<usize>>::Output> {
if y >= self.rows() || x >= self.columns() {
return None;
}
let i = y * self.columns() + x;
let indexer = &(*self as &dyn Index<usize, Output = <Self as Index<usize>>::Output>);
//~^ERROR non-primitive cast
Some(indexer.index(i))
}
}
fn main() {}
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