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//! Smart pointer type aliases.
use std::rc::Rc;
use std::sync::Arc;
use feature_macros::feature_specific;
use paste::paste;
use crate::errors::ptr::{SomePtrError, SomeThreadsafePtrError};
/// A smart pointer for a interface in the transient scope.
pub type TransientPtr<Interface> = Box<Interface>;
/// A smart pointer to a interface in the singleton scope.
pub type SingletonPtr<Interface> = Rc<Interface>;
/// A threadsafe smart pointer to a interface in the singleton scope.
pub type ThreadsafeSingletonPtr<Interface> = Arc<Interface>;
/// A smart pointer to a factory.
#[feature_specific("factory")]
pub type FactoryPtr<FactoryInterface> = Rc<FactoryInterface>;
/// A threadsafe smart pointer to a factory.
#[feature_specific("factory")]
pub type ThreadsafeFactoryPtr<FactoryInterface> = Arc<FactoryInterface>;
macro_rules! create_as_variant_fn {
($enum: ident, $variant: ident) => {
create_as_variant_fn!($enum, $variant,);
};
($enum: ident, $variant: ident, $($attrs: meta),*) => {
paste! {
#[doc =
"Returns as the `" [<$variant>] "` variant.\n"
"\n"
"# Errors\n"
"Will return Err if it's not the `" [<$variant>] "` variant."
]
$(#[$attrs]),*
pub fn [<$variant:snake>](self) -> Result<[<$variant Ptr>]<Interface>, [<$enum Error>]>
{
if let $enum::$variant(ptr) = self {
return Ok(ptr);
}
Err([<$enum Error>]::WrongPtrType {
expected: stringify!($variant),
found: self.into()
})
}
}
};
}
/// Some smart pointer.
#[derive(strum_macros::IntoStaticStr)]
pub enum SomePtr<Interface>
where
Interface: 'static + ?Sized,
{
/// A smart pointer to a interface in the transient scope.
Transient(TransientPtr<Interface>),
/// A smart pointer to a interface in the singleton scope.
Singleton(SingletonPtr<Interface>),
/// A smart pointer to a factory.
#[cfg(feature = "factory")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "factory")))]
Factory(FactoryPtr<Interface>),
}
impl<Interface> SomePtr<Interface>
where
Interface: 'static + ?Sized,
{
create_as_variant_fn!(SomePtr, Transient);
create_as_variant_fn!(SomePtr, Singleton);
create_as_variant_fn!(SomePtr, Factory, feature_specific("factory"));
}
/// Some threadsafe smart pointer.
#[derive(strum_macros::IntoStaticStr)]
pub enum SomeThreadsafePtr<Interface>
where
Interface: 'static + ?Sized,
{
/// A smart pointer to a interface in the transient scope.
Transient(TransientPtr<Interface>),
/// A smart pointer to a interface in the singleton scope.
ThreadsafeSingleton(ThreadsafeSingletonPtr<Interface>),
/// A smart pointer to a factory.
#[cfg(feature = "factory")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "factory")))]
ThreadsafeFactory(ThreadsafeFactoryPtr<Interface>),
}
impl<Interface> SomeThreadsafePtr<Interface>
where
Interface: 'static + ?Sized,
{
create_as_variant_fn!(SomeThreadsafePtr, Transient);
create_as_variant_fn!(SomeThreadsafePtr, ThreadsafeSingleton);
create_as_variant_fn!(
SomeThreadsafePtr,
ThreadsafeFactory,
feature_specific("factory")
);
}
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