pipecircuit 0.0.10

Correct. Robust. Fast. Portable.
Documentation 
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use alloc::{collections::TryReserveError, vec::Vec};
use core::num::TryFromIntError;

use super::StableSlots;

#[derive(Debug)]
pub enum StableSlotsCreationError {
    CapacityUnrepresentable {
        maximum_rows: usize,
        source: TryFromIntError,
    },
    RowStorageUnavailable {
        source: TryReserveError,
    },
    SlotStorageUnavailable {
        source: TryReserveError,
    },
}

impl StableSlots {
    pub fn try_new(maximum_rows: usize) -> Result<Self, StableSlotsCreationError> {
        u32::try_from(maximum_rows).map_err(|source| {
            StableSlotsCreationError::CapacityUnrepresentable {
                maximum_rows,
                source,
            }
        })?;
        let mut row_to_slot = Vec::new();
        row_to_slot
            .try_reserve_exact(maximum_rows)
            .map_err(|source| StableSlotsCreationError::RowStorageUnavailable { source })?;
        let mut slot_locations = Vec::new();
        slot_locations
            .try_reserve_exact(maximum_rows)
            .map_err(|source| StableSlotsCreationError::SlotStorageUnavailable { source })?;
        Ok(Self {
            maximum_rows,
            row_to_slot,
            slot_locations,
            first_free: None,
        })
    }
}