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use crate::dimension::IntoDimension;
use crate::Dimension;
use crate::{Shape, StrideShape};
/// A trait for `Shape` and `D where D: Dimension` that allows
/// customizing the memory layout (strides) of an array shape.
///
/// This trait is used together with array constructor methods like
/// `Array::from_shape_vec`.
pub trait ShapeBuilder {
type Dim: Dimension;
type Strides;
fn into_shape(self) -> Shape<Self::Dim>;
fn f(self) -> Shape<Self::Dim>;
fn set_f(self, is_f: bool) -> Shape<Self::Dim>;
fn strides(self, strides: Self::Strides) -> StrideShape<Self::Dim>;
}
impl<D> From<D> for Shape<D>
where
D: Dimension,
{
/// Create a `Shape` from `dimension`, using the default memory layout.
fn from(dimension: D) -> Shape<D> {
dimension.into_shape()
}
}
impl<T, D> From<T> for StrideShape<D>
where
D: Dimension,
T: ShapeBuilder<Dim = D>,
{
fn from(value: T) -> Self {
let shape = value.into_shape();
let d = shape.dim;
let st = if shape.is_c {
d.default_strides()
} else {
d.fortran_strides()
};
StrideShape {
strides: st,
dim: d,
custom: false,
}
}
}
/*
impl<D> From<Shape<D>> for StrideShape<D>
where D: Dimension
{
fn from(shape: Shape<D>) -> Self {
let d = shape.dim;
let st = if shape.is_c { d.default_strides() } else { d.fortran_strides() };
StrideShape {
strides: st,
dim: d,
custom: false,
}
}
}
*/
impl<T> ShapeBuilder for T
where
T: IntoDimension,
{
type Dim = T::Dim;
type Strides = T;
fn into_shape(self) -> Shape<Self::Dim> {
Shape {
dim: self.into_dimension(),
is_c: true,
}
}
fn f(self) -> Shape<Self::Dim> {
self.set_f(true)
}
fn set_f(self, is_f: bool) -> Shape<Self::Dim> {
self.into_shape().set_f(is_f)
}
fn strides(self, st: T) -> StrideShape<Self::Dim> {
self.into_shape().strides(st.into_dimension())
}
}
impl<D> ShapeBuilder for Shape<D>
where
D: Dimension,
{
type Dim = D;
type Strides = D;
fn into_shape(self) -> Shape<D> {
self
}
fn f(self) -> Self {
self.set_f(true)
}
fn set_f(mut self, is_f: bool) -> Self {
self.is_c = !is_f;
self
}
fn strides(self, st: D) -> StrideShape<D> {
StrideShape {
dim: self.dim,
strides: st,
custom: true,
}
}
}
impl<D> Shape<D>
where
D: Dimension,
{
// Return a reference to the dimension
//pub fn dimension(&self) -> &D { &self.dim }
/// Return the size of the shape in number of elements
pub fn size(&self) -> usize {
self.dim.size()
}
}