Closed
Description
I have been reviewing #606 and to better understand how the code works I was trying to rewrite it (it usually helps me).
The skeleton of what I was trying to do looks like this:
fn format_array<A, S, D, F>(
view: &ArrayBase<S, D>,
f: &mut fmt::Formatter,
mut format: F,
limit: Ix) -> fmt::Result
where
F: FnMut(&A, &mut fmt::Formatter) -> fmt::Result,
D: Dimension,
S: Data<Elem=A>,
{
match view.shape() {
[] => format(view.iter().next().unwrap(), f)?,
[_] => format_1d_array(&view, f, format, limit)?,
shape => {
let first_axis_length = shape[0];
let indexes_to_be_printed: Vec<Option<usize>> = [...]
write!(f, "[")?;
for index in indexes_to_be_printed {
match index {
Some(i) => format_array(
&view.index_axis(Axis(0), i), f, format, limit
)?,
None => {
writeln!(f, "...,")?
}
}
}
write!(f, "]")?;
}
}
Ok(())
}If I try to compile it, I obviously get this error:
error[E0277]: the trait bound `D: dimension::remove_axis::RemoveAxis` is not satisfied
--> src/arrayformat.rs:111:31
|
111 | &view.index_axis(Axis(0), i), f, format, limit
| ^^^^^^^^^^ the trait `dimension::remove_axis::RemoveAxis` is not implemented for `D`
|
= help: consider adding a `where D: dimension::remove_axis::RemoveAxis` bound
At this point I'd have liked to work with a dynamical dimension: get a "dynamically dimensioned" view of my ArrayBase reference and take the risk of a panic when using index_array (if I try to pass invalid parameters).
Is this even possible?
Looking at the signature of into_dyn, it seems I need to consume the array in the conversion, which is something I can't do.
Is there an alternative I can use that could work with this function skeleton?