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oco merge issues

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Greg Johnston 2024-05-31 12:03:38 -04:00
parent 846ff2fefb
commit de3dd3c296
2 changed files with 93 additions and 39 deletions
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1
oco/Cargo.toml
View file

@ -1,6 +1,5 @@
[package]
name = "oco_ref"
name = "oco_ref"
edition = "2021"
version = "0.2.0"
authors = ["Danik Vitek", "Greg Johnston"]

131
oco/src/lib.rs
View file

@ -1,6 +1,36 @@
//! This module contains the `Oco` (Owned Clones Once) smart pointer,
//! which is used to store immutable references to values.
//! This is useful for storing, for example, strings.
//!
//! Imagine this as an alternative to [`Cow`] with an additional, reference-counted
//! branch.
//!
//! ```rust
//! use oco_ref::Oco;
//! use std::sync::Arc;
//!
//! let static_str = "foo";
//! let rc_str: Arc<str> = "bar".into();
//! let owned_str: String = "baz".into();
//!
//! fn uses_oco(value: impl Into<Oco<'static, str>>) {
//! let mut value = value.into();
//!
//! // ensures that the value is either a reference, or reference-counted
//! // O(n) at worst
//! let clone1 = value.clone_inplace();
//!
//! // these subsequent clones are O(1)
//! let clone2 = value.clone();
//! let clone3 = value.clone();
//! }
//!
//! uses_oco(static_str);
//! uses_oco(rc_str);
//! uses_oco(owned_str);
//! ```
#![forbid(unsafe_code)]
#![deny(missing_docs)]
use serde::{de::DeserializeOwned, Deserialize, Serialize};
use std::{
@ -10,24 +40,32 @@ use std::{
hash::Hash,
ops::{Add, Deref},
path::Path,
rc::Rc,
sync::Arc,
};
/// "Owned Clones Once" - a smart pointer that can be either a reference,
/// an owned value, or a reference counted pointer. This is useful for
/// "Owned Clones Once": a smart pointer that can be either a reference,
/// an owned value, or a reference-counted pointer. This is useful for
/// storing immutable values, such as strings, in a way that is cheap to
/// clone and pass around.
///
/// The `Clone` implementation is amortized `O(1)`. Cloning the [`Oco::Borrowed`]
/// The cost of the `Clone` implementation depends on the branch. Cloning the [`Oco::Borrowed`]
/// variant simply copies the references (`O(1)`). Cloning the [`Oco::Counted`]
/// variant increments a reference count (`O(1)`). Cloning the [`Oco::Owned`]
/// variant upgrades it to [`Oco::Counted`], which requires an `O(n)` clone of the
/// data, but all subsequent clones will be `O(1)`.
/// variant requires an `O(n)` clone of the data.
///
/// For an amortized `O(1)` clone, you can use [`Oco::clone_inplace()`]. Using this method,
/// [`Oco::Borrowed`] and [`Oco::Counted`] are still `O(1)`. [`Oco::Owned`] does a single `O(n)`
/// clone, but converts the object to the [`Oco::Counted`] branch, which means future clones will
/// be `O(1)`.
///
/// In general, you'll either want to call `clone_inplace()` once, before sharing the `Oco` with
/// other parts of your application (so that all future clones are `O(1)`), or simply use this as
/// if it is a [`Cow`] with an additional branch for reference-counted values.
pub enum Oco<'a, T: ?Sized + ToOwned + 'a> {
/// A static reference to a value.
Borrowed(&'a T),
/// A reference counted pointer to a value.
Counted(Rc<T>),
Counted(Arc<T>),
/// An owned value.
Owned(<T as ToOwned>::Owned),
}
@ -45,10 +83,10 @@ impl<'a, T: ?Sized + ToOwned> Oco<'a, T> {
/// Checks if the value is [`Oco::Borrowed`].
/// # Examples
/// ```
/// # use std::rc::Rc;
/// # use leptos_reactive::oco::Oco;
/// # use std::sync::Arc;
/// # use oco_ref::Oco;
/// assert!(Oco::<str>::Borrowed("Hello").is_borrowed());
/// assert!(!Oco::<str>::Counted(Rc::from("Hello")).is_borrowed());
/// assert!(!Oco::<str>::Counted(Arc::from("Hello")).is_borrowed());
/// assert!(!Oco::<str>::Owned("Hello".to_string()).is_borrowed());
/// ```
pub const fn is_borrowed(&self) -> bool {
@ -58,9 +96,9 @@ impl<'a, T: ?Sized + ToOwned> Oco<'a, T> {
/// Checks if the value is [`Oco::Counted`].
/// # Examples
/// ```
/// # use std::rc::Rc;
/// # use leptos_reactive::oco::Oco;
/// assert!(Oco::<str>::Counted(Rc::from("Hello")).is_counted());
/// # use std::sync::Arc;
/// # use oco_ref::Oco;
/// assert!(Oco::<str>::Counted(Arc::from("Hello")).is_counted());
/// assert!(!Oco::<str>::Borrowed("Hello").is_counted());
/// assert!(!Oco::<str>::Owned("Hello".to_string()).is_counted());
/// ```
@ -71,11 +109,11 @@ impl<'a, T: ?Sized + ToOwned> Oco<'a, T> {
/// Checks if the value is [`Oco::Owned`].
/// # Examples
/// ```
/// # use std::rc::Rc;
/// # use leptos_reactive::oco::Oco;
/// # use std::sync::Arc;
/// # use oco_ref::Oco;
/// assert!(Oco::<str>::Owned("Hello".to_string()).is_owned());
/// assert!(!Oco::<str>::Borrowed("Hello").is_owned());
/// assert!(!Oco::<str>::Counted(Rc::from("Hello")).is_owned());
/// assert!(!Oco::<str>::Counted(Arc::from("Hello")).is_owned());
/// ```
pub const fn is_owned(&self) -> bool {
matches!(self, Oco::Owned(_))
@ -130,7 +168,7 @@ impl Oco<'_, str> {
/// Returns a `&str` slice of this [`Oco`].
/// # Examples
/// ```
/// # use leptos_reactive::oco::Oco;
/// # use oco_ref::Oco;
/// let oco = Oco::<str>::Borrowed("Hello");
/// let s: &str = oco.as_str();
/// assert_eq!(s, "Hello");
@ -145,7 +183,7 @@ impl Oco<'_, CStr> {
/// Returns a `&CStr` slice of this [`Oco`].
/// # Examples
/// ```
/// # use leptos_reactive::oco::Oco;
/// # use oco_ref::Oco;
/// use std::ffi::CStr;
///
/// let oco =
@ -163,7 +201,7 @@ impl Oco<'_, OsStr> {
/// Returns a `&OsStr` slice of this [`Oco`].
/// # Examples
/// ```
/// # use leptos_reactive::oco::Oco;
/// # use oco_ref::Oco;
/// use std::ffi::OsStr;
///
/// let oco = Oco::<OsStr>::Borrowed(OsStr::new("Hello"));
@ -180,7 +218,7 @@ impl Oco<'_, Path> {
/// Returns a `&Path` slice of this [`Oco`].
/// # Examples
/// ```
/// # use leptos_reactive::oco::Oco;
/// # use oco_ref::Oco;
/// use std::path::Path;
///
/// let oco = Oco::<Path>::Borrowed(Path::new("Hello"));
@ -200,7 +238,7 @@ where
/// Returns a `&[T]` slice of this [`Oco`].
/// # Examples
/// ```
/// # use leptos_reactive::oco::Oco;
/// # use oco_ref::Oco;
/// let oco = Oco::<[u8]>::Borrowed(b"Hello");
/// let s: &[u8] = oco.as_slice();
/// assert_eq!(s, b"Hello");
@ -214,7 +252,7 @@ where
impl<'a, T> Clone for Oco<'a, T>
where
T: ?Sized + ToOwned + 'a,
for<'b> Rc<T>: From<&'b T>,
for<'b> Arc<T>: From<&'b T>,
{
/// Returns a new [`Oco`] with the same value as this one.
/// If the value is [`Oco::Owned`], this will convert it into
@ -222,7 +260,7 @@ where
/// # Examples
/// [`String`] :
/// ```
/// # use leptos_reactive::oco::Oco;
/// # use oco_ref::Oco;
/// let oco = Oco::<str>::Owned("Hello".to_string());
/// let oco2 = oco.clone();
/// assert_eq!(oco, oco2);
@ -230,7 +268,7 @@ where
/// ```
/// [`Vec`] :
/// ```
/// # use leptos_reactive::oco::Oco;
/// # use oco_ref::Oco;
/// let oco = Oco::<[u8]>::Owned(b"Hello".to_vec());
/// let oco2 = oco.clone();
/// assert_eq!(oco, oco2);
@ -239,8 +277,8 @@ where
fn clone(&self) -> Self {
match self {
Self::Borrowed(v) => Self::Borrowed(v),
Self::Counted(v) => Self::Counted(Rc::clone(v)),
Self::Owned(v) => Self::Counted(Rc::from(v.borrow())),
Self::Counted(v) => Self::Counted(Arc::clone(v)),
Self::Owned(v) => Self::Counted(Arc::from(v.borrow())),
}
}
}
@ -248,13 +286,30 @@ where
impl<'a, T> Oco<'a, T>
where
T: ?Sized + ToOwned + 'a,
for<'b> Rc<T>: From<&'b T>,
for<'b> Arc<T>: From<&'b T>,
{
/// Upgrades the value in place, by converting into [`Oco::Counted`] if it
/// was previously [`Oco::Owned`].
/// # Examples
/// ```
/// # use oco_ref::Oco;
/// let mut oco1 = Oco::<str>::Owned("Hello".to_string());
/// assert!(oco1.is_owned());
/// oco1.upgrade_inplace();
/// assert!(oco1.is_counted());
/// ```
pub fn upgrade_inplace(&mut self) {
if let Self::Owned(v) = &*self {
let rc = Arc::from(v.borrow());
*self = Self::Counted(rc);
}
}
/// Clones the value with inplace conversion into [`Oco::Counted`] if it
/// was previously [`Oco::Owned`].
/// # Examples
/// ```
/// # use leptos_reactive::oco::Oco;
/// # use oco_ref::Oco;
/// let mut oco1 = Oco::<str>::Owned("Hello".to_string());
/// let oco2 = oco1.clone_inplace();
/// assert_eq!(oco1, oco2);
@ -264,9 +319,9 @@ where
pub fn clone_inplace(&mut self) -> Self {
match &*self {
Self::Borrowed(v) => Self::Borrowed(v),
Self::Counted(v) => Self::Counted(Rc::clone(v)),
Self::Counted(v) => Self::Counted(Arc::clone(v)),
Self::Owned(v) => {
let rc = Rc::from(v.borrow());
let rc = Arc::from(v.borrow());
*self = Self::Counted(rc.clone());
Self::Counted(rc)
}
@ -378,11 +433,11 @@ where
}
}
impl<T: ?Sized> From<Rc<T>> for Oco<'_, T>
impl<T: ?Sized> From<Arc<T>> for Oco<'_, T>
where
T: ToOwned,
{
fn from(v: Rc<T>) -> Self {
fn from(v: Arc<T>) -> Self {
Oco::Counted(v)
}
}
@ -563,7 +618,7 @@ mod tests {
fn debug_fmt_should_display_quotes_for_strings() {
let s: Oco<str> = Oco::Borrowed("hello");
assert_eq!(format!("{s:?}"), "\"hello\"");
let s: Oco<str> = Oco::Counted(Rc::from("hello"));
let s: Oco<str> = Oco::Counted(Arc::from("hello"));
assert_eq!(format!("{s:?}"), "\"hello\"");
}
@ -601,7 +656,7 @@ mod tests {
fn as_str_should_return_a_str() {
let s: Oco<str> = Oco::Borrowed("hello");
assert_eq!(s.as_str(), "hello");
let s: Oco<str> = Oco::Counted(Rc::from("hello"));
let s: Oco<str> = Oco::Counted(Arc::from("hello"));
assert_eq!(s.as_str(), "hello");
}
@ -609,7 +664,7 @@ mod tests {
fn as_slice_should_return_a_slice() {
let s: Oco<[i32]> = Oco::Borrowed([1, 2, 3].as_slice());
assert_eq!(s.as_slice(), [1, 2, 3].as_slice());
let s: Oco<[i32]> = Oco::Counted(Rc::from([1, 2, 3]));
let s: Oco<[i32]> = Oco::Counted(Arc::from([1, 2, 3]));
assert_eq!(s.as_slice(), [1, 2, 3].as_slice());
}
@ -645,7 +700,7 @@ mod tests {
#[test]
fn cloned_counted_str_should_make_counted_str() {
let s: Oco<str> = Oco::Counted(Rc::from("hello"));
let s: Oco<str> = Oco::Counted(Arc::from("hello"));
assert!(s.clone().is_counted());
}
@ -667,7 +722,7 @@ mod tests {
#[test]
fn cloned_inplace_counted_str_should_make_counted_str_and_remain_counted() {
let mut s: Oco<str> = Oco::Counted(Rc::from("hello"));
let mut s: Oco<str> = Oco::Counted(Arc::from("hello"));
assert!(s.clone_inplace().is_counted());
assert!(s.is_counted());
}