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#![allow(clippy::module_name_repetitions)]
//! Smart pointer type aliases.
use std::rc::Rc;
use paste::paste;
use crate::errors::ptr::SomePtrError;
/// 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 smart pointer to a factory.
pub type FactoryPtr<FactoryInterface> = Rc<FactoryInterface>;
/// 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.
Factory(FactoryPtr<Interface>),
}
macro_rules! create_as_variant_fn {
($variant: ident) => {
paste! {
#[doc =
"Returns as " [<$variant:lower>] ".\n"
"\n"
"# Errors\n"
"Will return Err if it's not a " [<$variant:lower>] "."
]
pub fn [<$variant:lower>](self) -> Result<[<$variant Ptr>]<Interface>, SomePtrError>
{
if let SomePtr::$variant(ptr) = self {
return Ok(ptr);
}
Err(SomePtrError::WrongPtrType {
expected: stringify!($variant),
found: self.into()
})
}
}
};
}
impl<Interface> SomePtr<Interface>
where
Interface: 'static + ?Sized,
{
create_as_variant_fn!(Transient);
create_as_variant_fn!(Singleton);
create_as_variant_fn!(Factory);
}
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