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use crate::dim::Dim;
use crate::expr::Producer;
use crate::expression::Expression;
/// Trait for applying a closure and returning a new or an existing array.
pub trait Apply<T>: IntoExpression {
/// The resulting type after applying a closure.
type Output: IntoExpression<Item = T, Dim = Self::Dim>;
/// The resulting type after zipping elements and applying a closure.
type ZippedWith<I: IntoExpression>: IntoExpression<Item = T>;
/// Returns a new or an existing array with the given closure applied to each element.
fn apply<F: FnMut(Self::Item) -> T>(self, f: F) -> Self::Output;
/// Returns a new or an existing array with the given closure applied to zipped element pairs.
fn zip_with<I: IntoExpression, F>(self, expr: I, f: F) -> Self::ZippedWith<I>
where
F: FnMut(Self::Item, I::Item) -> T;
}
/// Trait for generalization of `Clone` that can reuse an existing object.
pub trait IntoCloned<T> {
/// Moves an existing object or clones from a reference to the target object.
fn clone_to(self, target: &mut T);
/// Returns an existing object or a new clone from a reference.
fn into_cloned(self) -> T;
}
/// Conversion trait into an expression.
pub trait IntoExpression {
/// Array element type.
type Item;
/// Array dimension type.
type Dim: Dim;
/// Which kind of expression producer are we turning this into?
type Producer: Producer<Item = Self::Item, Dim = Self::Dim>;
/// Creates an expression from a value.
fn into_expr(self) -> Expression<Self::Producer>;
}
impl<T: Clone> IntoCloned<T> for &T {
fn clone_to(self, target: &mut T) {
target.clone_from(self);
}
fn into_cloned(self) -> T {
self.clone()
}
}
impl<T> IntoCloned<T> for T {
fn clone_to(self, target: &mut T) {
*target = self;
}
fn into_cloned(self) -> T {
self
}
}