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use std::fmt;
use std::error::Error;
use super::{
Ix,
Dimension,
};
#[derive(Clone, Debug)]
pub enum ShapeError {
IncompatibleShapes(Box<[Ix]>, Box<[Ix]>),
IncompatibleLayout,
DimensionTooLarge(Box<[Ix]>),
}
#[inline(never)]
#[cold]
pub fn incompatible_shapes<D, E>(a: &D, b: &E) -> ShapeError
where D: Dimension,
E: Dimension
{
ShapeError::IncompatibleShapes(a.slice().to_vec().into_boxed_slice(),
b.slice().to_vec().into_boxed_slice())
}
impl Error for ShapeError {
fn description(&self) -> &str {
match *self {
ShapeError::IncompatibleShapes(..) => "incompatible shapes",
ShapeError::IncompatibleLayout => "incompatible layout (not contiguous)",
ShapeError::DimensionTooLarge(..) => "dimension too large",
}
}
}
impl fmt::Display for ShapeError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
ShapeError::IncompatibleShapes(ref a, ref b) => {
write!(f, "incompatible shapes, attempted from: {:?}, to: {:?}",
a, b)
}
ShapeError::IncompatibleLayout => {
write!(f, "{}", self.description())
}
ShapeError::DimensionTooLarge(ref a) => {
write!(f, "dimension too large in shape {:?}", a)
}
}
}
}