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pub use rdi_macros::{inject, injector};
pub trait Injectable<'a> {
type Output: 'a;
type Injected: 'a;
fn inject(self, injected: Self::Injected) -> Self::Output;
}
pub trait Provider<T> {
fn provide(&self) -> T;
}
macro_rules! impl_provider {
(
$(
$name:ident
),*
) => {
impl<$($name),*, P> Provider<($($name,)*)> for P
where
$(
Self: Value<$name>,
)*
{
fn provide(&self) -> ($($name,)*) {
let provided: ($($name,)*) = ($(Value::<$name>::value(self),)*);
provided
}
}
};
}
impl_provider!(A);
impl_provider!(A, B);
impl_provider!(A, B, C);
impl_provider!(A, B, C, D);
impl_provider!(A, B, C, D, E);
impl_provider!(A, B, C, D, E, F);
impl_provider!(A, B, C, D, E, F, G);
impl_provider!(A, B, C, D, E, F, G, H);
impl_provider!(A, B, C, D, E, F, G, H, J);
impl_provider!(A, B, C, D, E, F, G, H, J, K);
impl_provider!(A, B, C, D, E, F, G, H, J, K, L);
impl_provider!(A, B, C, D, E, F, G, H, J, K, L, M);
pub trait Value<T> {
fn value(&self) -> T;
}
#[cfg(test)]
mod tests {
use std::sync::Arc;
use super::*;
struct OkInjector {
test: Arc<Test>,
}
struct Test {}
impl Value<Arc<Test>> for OkInjector {
fn value(&self) -> Arc<Test> {
self.test.clone()
}
}
impl OkInjector {
fn inject<'a, T>(&self, t: T) -> T::Output
where
Self: Provider<T::Injected>,
T: Injectable<'a>,
{
let injected = self.provide();
t.inject(injected)
}
}
#[allow(non_camel_case_types)]
struct handler;
impl<'a> Injectable<'a> for handler {
type Output = &'a dyn Fn();
type Injected = (Arc<Test>,);
fn inject(self, _injected: Self::Injected) -> Self::Output {
&|| {}
}
}
#[test]
fn test() {
let injector = OkInjector {
test: Arc::new(Test {}),
};
let my_handler = injector.inject(handler);
my_handler();
}
}