copyspan 0.2.0

An alternative to `Range<T>` that has a defined memory layout and implements `Copy`
Documentation 
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use core::{hash::Hash, ops::Add};

#[allow(unused)]
pub trait Dummy {}
impl<T> Dummy for T {}

#[cfg(feature = "alloc")]
use alloc::fmt::Debug as AllocRequirements;

#[cfg(not(feature = "alloc"))]
use Dummy as AllocRequirements;

#[doc(hidden)]
pub trait RustNumber:
    Default
    + Clone
    + Copy
    + Add<Self, Output = Self>
    + PartialOrd
    + Ord
    + PartialEq
    + Eq
    + AllocRequirements
    + Hash
{
    const ONE: Self;

    fn saturating_sub(self, rhs: Self) -> Self;
}

macro_rules! impl_rustnumber {
    ($ty:ty) => {
        impl RustNumber for $ty {
            const ONE: Self = 1;

            fn saturating_sub(self, rhs: Self) -> Self {
                self.saturating_sub(rhs)
            }
        }
    };
}

impl_rustnumber!(u8);
impl_rustnumber!(u16);
impl_rustnumber!(u32);
impl_rustnumber!(u64);
impl_rustnumber!(usize);
impl_rustnumber!(i8);
impl_rustnumber!(i16);
impl_rustnumber!(i32);
impl_rustnumber!(i64);
impl_rustnumber!(isize);