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use crate::interfaces::any_factory::AnyFactory;
use crate::interfaces::factory::IFactory;
use crate::ptr::TransientPtr;
pub struct CastableFactory<Args, ReturnInterface>
where
Args: 'static,
ReturnInterface: 'static + ?Sized,
{
func: &'static dyn Fn<Args, Output = TransientPtr<ReturnInterface>>,
}
impl<Args, ReturnInterface> CastableFactory<Args, ReturnInterface>
where
Args: 'static,
ReturnInterface: 'static + ?Sized,
{
pub fn new(
func: &'static dyn Fn<Args, Output = TransientPtr<ReturnInterface>>,
) -> Self
{
Self { func }
}
}
impl<Args, ReturnInterface> IFactory<Args, ReturnInterface>
for CastableFactory<Args, ReturnInterface>
where
Args: 'static,
ReturnInterface: 'static + ?Sized,
{
}
impl<Args, ReturnInterface> Fn<Args> for CastableFactory<Args, ReturnInterface>
where
Args: 'static,
ReturnInterface: 'static + ?Sized,
{
extern "rust-call" fn call(&self, args: Args) -> Self::Output
{
self.func.call(args)
}
}
impl<Args, ReturnInterface> FnMut<Args> for CastableFactory<Args, ReturnInterface>
where
Args: 'static,
ReturnInterface: 'static + ?Sized,
{
extern "rust-call" fn call_mut(&mut self, args: Args) -> Self::Output
{
self.call(args)
}
}
impl<Args, ReturnInterface> FnOnce<Args> for CastableFactory<Args, ReturnInterface>
where
Args: 'static,
ReturnInterface: 'static + ?Sized,
{
type Output = TransientPtr<ReturnInterface>;
extern "rust-call" fn call_once(self, args: Args) -> Self::Output
{
self.call(args)
}
}
impl<Args, ReturnInterface> AnyFactory for CastableFactory<Args, ReturnInterface>
where
Args: 'static,
ReturnInterface: 'static + ?Sized,
{
}
#[cfg(test)]
mod tests
{
use super::*;
#[test]
fn can_call()
{
#[derive(Debug, PartialEq, Eq)]
struct Bacon
{
heal_amount: u32,
}
let castable_factory =
CastableFactory::new(&|heal_amount| TransientPtr::new(Bacon { heal_amount }));
let output = castable_factory(27);
assert_eq!(output, Box::new(Bacon { heal_amount: 27 }));
}
}
|
