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use std::any::type_name;
use std::fmt::Debug;
use std::marker::Tuple;
use crate::interfaces::any_factory::AnyFactory;
use crate::interfaces::factory::IFactory;
use crate::ptr::TransientPtr;
pub struct CastableFactory<Args, ReturnInterface>
where
Args: Tuple + 'static,
ReturnInterface: 'static + ?Sized,
{
func: &'static dyn Fn<Args, Output = TransientPtr<ReturnInterface>>,
}
impl<Args, ReturnInterface> CastableFactory<Args, ReturnInterface>
where
Args: Tuple + '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: Tuple + 'static,
ReturnInterface: 'static + ?Sized,
{
}
impl<Args, ReturnInterface> Fn<Args> for CastableFactory<Args, ReturnInterface>
where
Args: Tuple + '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: Tuple + '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: Tuple + '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: Tuple + 'static,
ReturnInterface: 'static + ?Sized,
{
}
impl<Args, ReturnInterface> Debug for CastableFactory<Args, ReturnInterface>
where
Args: Tuple + 'static,
ReturnInterface: 'static + ?Sized,
{
#[cfg(not(tarpaulin_include))]
fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result
{
let mut args = type_name::<Args>();
if args.len() < 2 {
return Err(std::fmt::Error::default());
}
args = args
.get(1..args.len() - 1)
.map_or_else(|| Err(std::fmt::Error::default()), Ok)?;
if args.ends_with(',') {
args = args
.get(..args.len() - 1)
.map_or_else(|| Err(std::fmt::Error), Ok)?;
}
let ret = type_name::<TransientPtr<ReturnInterface>>();
formatter.write_fmt(format_args!("CastableFactory ({}) -> {}", args, ret))
}
}
#[cfg(test)]
mod tests
{
use super::*;
#[derive(Debug, PartialEq, Eq)]
struct Bacon
{
heal_amount: u32,
}
#[test]
fn can_call()
{
let castable_factory =
CastableFactory::new(&|heal_amount| TransientPtr::new(Bacon { heal_amount }));
let output = castable_factory.call((27,));
assert_eq!(output, TransientPtr::new(Bacon { heal_amount: 27 }));
}
#[test]
fn can_call_mut()
{
let mut castable_factory =
CastableFactory::new(&|heal_amount| TransientPtr::new(Bacon { heal_amount }));
let output = castable_factory.call_mut((103,));
assert_eq!(output, TransientPtr::new(Bacon { heal_amount: 103 }));
}
#[test]
fn can_call_once()
{
let castable_factory =
CastableFactory::new(&|heal_amount| TransientPtr::new(Bacon { heal_amount }));
let output = castable_factory.call_once((19,));
assert_eq!(output, TransientPtr::new(Bacon { heal_amount: 19 }));
}
}
|
