libpitust 0.1.0

libpitust implements random utility functions I tend to use a lot
Documentation 
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use std::{fmt::Debug, marker::PhantomData};

use crate::index::Idx;

#[derive(Clone, Copy)]
pub struct Embedding<I: Idx, J: Idx> {
    em_start: u32,

    #[cfg(debug_assertions)]
    em_size: u32,

    _marker: PhantomData<(I, J)>,
}
impl<I: Idx, J: Idx> Embedding<I, J> {
    pub fn get(self, index: J) -> I {
        #[cfg(debug_assertions)]
        {
            assert!(index.index() < self.em_size as u64);
        }

        Idx::new(self.em_start as u64 + index.index())
    }
}

impl<I: Idx> Debug for Alloc<I> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let next = <I as Idx>::new(self.cur_head as u64);
        f.debug_struct("Alloc").field("next", &next).finish()
    }
}
pub struct Alloc<I: Idx> {
    cur_head: u32,
    _marker: PhantomData<I>,
}
impl<I: Idx> Alloc<I> {
    pub fn new() -> Alloc<I> {
        Alloc {
            cur_head: 0,
            _marker: PhantomData,
        }
    }
    pub fn new_at(min: usize) -> Alloc<I> {
        Alloc {
            cur_head: min as u32,
            _marker: PhantomData,
        }
    }
    pub fn alloc(&mut self) -> I {
        self.cur_head += 1;
        Idx::new((self.cur_head - 1) as u64)
    }
    pub fn alloc_embedding<J: Idx>(&mut self, len: usize) -> Embedding<I, J> {
        let start = self.cur_head;
        self.cur_head += len as u32;

        Embedding {
            em_start: start,
            #[cfg(debug_assertions)]
            em_size: len as u32,
            _marker: PhantomData,
        }
    }
}