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use crate::{pool::Pool, IdAble};
use core::marker::PhantomData;
#[cfg(feature = "serde")]
use serde::{Deserialize, Serialize};
pub trait Behavior: Sized {
type Id: IdAble;
type Return;
fn next(pool: &mut Pool<Self>) -> Self::Return;
}
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[derive(Debug, PartialEq)]
pub struct Checked<Id: IdAble> {
_p: PhantomData<Id>,
}
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[derive(Debug, PartialEq)]
pub struct UnChecked<Id: IdAble> {
_p: PhantomData<Id>,
}
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[derive(Debug, PartialEq)]
pub struct Wrapping<Id: IdAble> {
_p: PhantomData<Id>,
}
impl<Id: IdAble> Behavior for Checked<Id> {
type Id = Id;
type Return = Result<Id, CheckedError>;
fn next(pool: &mut Pool<Self>) -> Self::Return {
if pool.buffer.start < pool.buffer.end {
let result = pool.buffer.start;
pool.buffer.start += pool.one;
Ok(result)
} else {
Err(CheckedError::PoolEmpty)
}
}
}
impl<Id: IdAble> Behavior for UnChecked<Id> {
type Id = Id;
type Return = Id;
fn next(pool: &mut Pool<Self>) -> Self::Return {
let result = pool.buffer.start;
pool.buffer.start += pool.one;
result
}
}
impl<Id: IdAble> Behavior for Wrapping<Id> {
type Id = Id;
type Return = Id;
fn next(pool: &mut Pool<Self>) -> Self::Return {
if pool.buffer.start < pool.buffer.end {
let result = pool.buffer.start;
pool.buffer.start += pool.one;
result
} else {
pool.buffer.start = pool.original_range.start + pool.one;
pool.original_range.start
}
}
}
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[derive(Debug, PartialEq)]
pub enum CheckedError {
PoolEmpty,
}
impl core::fmt::Display for CheckedError {
fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
match self {
CheckedError::PoolEmpty => write!(f, "pool is empty, all Id's are used up"),
}
}
}
#[cfg(feature = "std")]
impl std::error::Error for CheckedError {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
None
}
}