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#![feature(generic_const_exprs)]
#![allow(incomplete_features)]
trait TensorDimension {
const DIM : usize;
const ISSCALAR : bool = Self::DIM == 0;
fn is_scalar(&self) -> bool {Self::ISSCALAR}
}
trait TensorSize : TensorDimension {
fn size(&self) -> [usize;Self::DIM];
fn inbounds(&self,index : [usize;Self::DIM]) -> bool {
index.iter().zip(self.size().iter()).all(|(i,s)| i < s)
}
}
trait Broadcastable: TensorSize + Sized {
type Element;
fn bget(&self, index:[usize;Self::DIM]) -> Option<Self::Element>;
fn lazy_updim<const NEWDIM : usize>(&self, size : [usize;NEWDIM] ) ->
LazyUpdim<Self,{Self::DIM},NEWDIM>
{
assert!(NEWDIM >= Self::DIM,
"Updimmed tensor cannot have fewer indices than the initial one.");
LazyUpdim {size,reference:&self}
}
fn bmap<T,F :Fn(Self::Element) -> T>(&self,foo : F) -> BMap<T,Self,F,{Self::DIM}>{
BMap {reference:self,closure : foo}
}
}
struct LazyUpdim<'a,T : Broadcastable,const OLDDIM : usize, const DIM : usize> {
size : [usize;DIM],
reference : &'a T
}
impl<'a,T : Broadcastable,const DIM : usize> TensorDimension for LazyUpdim<'a,T,{T::DIM},DIM> {
const DIM : usize = DIM;
}
impl<'a,T : Broadcastable,const DIM : usize> TensorSize for LazyUpdim<'a,T,{T::DIM},DIM> {
fn size(&self) -> [usize;DIM] {self.size}
//~^ ERROR method not compatible with trait
}
impl<'a,T : Broadcastable,const DIM : usize> Broadcastable for LazyUpdim<'a,T,{T::DIM},DIM>
{
type Element = T::Element;
fn bget(&self,index:[usize;DIM]) -> Option<Self::Element> {
//~^ ERROR method not compatible with trait
assert!(DIM >= T::DIM);
if !self.inbounds(index) {return None}
//~^ ERROR unconstrained generic constant
//~| ERROR mismatched types
let size = self.size();
//~^ ERROR unconstrained generic constant
let newindex : [usize;T::DIM] = Default::default();
//~^ ERROR the trait bound `[usize; _]: Default` is not satisfied
self.reference.bget(newindex)
}
}
struct BMap<'a,R, T : Broadcastable, F : Fn(T::Element) -> R , const DIM: usize> {
reference : &'a T,
closure : F
}
impl<'a,R, T : Broadcastable, F : Fn(T::Element) -> R,
const DIM: usize> TensorDimension for BMap<'a,R,T,F,DIM> {
const DIM : usize = DIM;
}
impl<'a,R, T : Broadcastable, F : Fn(T::Element) -> R ,
const DIM: usize> TensorSize for BMap<'a,R,T,F,DIM> {
fn size(&self) -> [usize;DIM] {self.reference.size()}
//~^ ERROR unconstrained generic constant
//~| ERROR mismatched types
//~| ERROR method not compatible with trait
}
impl<'a,R, T : Broadcastable, F : Fn(T::Element) -> R ,
const DIM: usize> Broadcastable for BMap<'a,R,T,F,DIM> {
type Element = R;
fn bget(&self,index:[usize;DIM]) -> Option<Self::Element> {
//~^ ERROR method not compatible with trait
self.reference.bget(index).map(&self.closure)
//~^ ERROR unconstrained generic constant
//~| ERROR mismatched types
}
}
impl<T> TensorDimension for Vec<T> {
const DIM : usize = 1;
}
impl<T> TensorSize for Vec<T> {
fn size(&self) -> [usize;1] {[self.len()]}
}
impl<T: Clone> Broadcastable for Vec<T> {
type Element = T;
fn bget(& self,index : [usize;1]) -> Option<T> {
self.get(index[0]).cloned()
}
}
fn main() {
let v = vec![1,2,3];
let bv = v.lazy_updim([3,4]);
let bbv = bv.bmap(|x| x*x);
println!("The size of v is {:?}",bbv.bget([0,2]).expect("Out of bounds."));
}
|
