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use std::cmp::{Eq, PartialEq};
#[repr(C)]
#[derive(Debug, Copy, Clone, StableAbi)]
pub struct ArrayLen<A> {
pub len: u16,
pub array: A,
}
impl<A> ArrayLen<A> {
pub const fn len(&self) -> usize {
self.len as usize
}
pub const fn is_empty(&self) -> bool {
self.len == 0
}
}
impl<A, T> PartialEq for ArrayLen<A>
where
A: ArrayTrait<Elem = T>,
T: PartialEq,
{
fn eq(&self, other: &Self) -> bool {
let t_slice = &self.array.as_slice()[..self.len as usize];
let o_slice = &other.array.as_slice()[..other.len as usize];
t_slice == o_slice
}
}
impl<A, T> Eq for ArrayLen<A>
where
A: ArrayTrait<Elem = T>,
T: Eq,
{
}
mod array_trait {
pub trait ArrayTrait {
type Elem;
fn as_slice(&self) -> &[Self::Elem];
}
}
use self::array_trait::ArrayTrait;
macro_rules! impl_stable_abi_array {
($($size:expr),*)=>{
$(
impl<T> ArrayTrait for [T;$size] {
type Elem=T;
fn as_slice(&self)->&[T]{
self
}
}
)*
}
}
impl_stable_abi_array! {
00,01,02,03,04,05,06,07,08
}