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#![warn(missing_docs)]
#[cfg(feature = "swappable")]
extern crate atomic_immut;
#[cfg(feature = "swappable")]
pub use swappable::SwappableFactory;
use std::marker::PhantomData;
#[cfg(feature = "swappable")]
mod swappable;
pub trait Factory {
type Item;
fn create(&self) -> Self::Item;
}
impl<T: ?Sized + Factory> Factory for &T {
type Item = T::Item;
fn create(&self) -> Self::Item {
(**self).create()
}
}
impl<T: ?Sized + Factory> Factory for Box<T> {
type Item = T::Item;
fn create(&self) -> Self::Item {
(**self).create()
}
}
pub trait ParameterizedFactory {
type Item;
type Parameter;
fn create(&self, param: Self::Parameter) -> Self::Item;
}
impl<T: ?Sized + ParameterizedFactory> ParameterizedFactory for &T {
type Item = T::Item;
type Parameter = T::Parameter;
fn create(&self, param: Self::Parameter) -> Self::Item {
(**self).create(param)
}
}
impl<T: ?Sized + ParameterizedFactory> ParameterizedFactory for Box<T> {
type Item = T::Item;
type Parameter = T::Parameter;
fn create(&self, param: Self::Parameter) -> Self::Item {
(**self).create(param)
}
}
#[derive(Debug, Default)]
pub struct DefaultFactory<T>(PhantomData<T>);
impl<T: Default> DefaultFactory<T> {
pub fn new() -> Self {
DefaultFactory(PhantomData)
}
}
impl<T: Default> Factory for DefaultFactory<T> {
type Item = T;
fn create(&self) -> Self::Item {
T::default()
}
}
impl<T> Clone for DefaultFactory<T> {
fn clone(&self) -> Self {
DefaultFactory(PhantomData)
}
}
unsafe impl<T> Send for DefaultFactory<T> {}
unsafe impl<T> Sync for DefaultFactory<T> {}
#[derive(Debug, Default, Clone)]
pub struct CloneFactory<T>(T);
impl<T: Clone> CloneFactory<T> {
pub fn new(original: T) -> Self {
CloneFactory(original)
}
pub fn get_ref(&self) -> &T {
&self.0
}
pub fn get_mut(&mut self) -> &mut T {
&mut self.0
}
}
impl<T: Clone> Factory for CloneFactory<T> {
type Item = T;
fn create(&self) -> Self::Item {
self.0.clone()
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn default_factory_works() {
let f = DefaultFactory::<u8>::new();
assert_eq!(f.create(), 0);
assert_eq!(f.clone().create(), 0);
}
#[test]
fn clone_factory_works() {
let mut f = CloneFactory::new(32);
assert_eq!(f.get_ref(), &32);
assert_eq!(f.create(), 32);
*f.get_mut() = 50;
assert_eq!(f.create(), 50);
}
}