feo_oop_engine/macros/
cast_macro.rs

1//! Casting in rust can be a bit ugly
2
3#[macro_export]
4macro_rules! downcast {
5    
6    ($a:expr, dyn Global, $t:ty) => {
7        {
8            $a.as_any().downcast_ref::<$t>().unwrap().clone()
9        }
10    };
11
12    // unsafe
13    ($a:expr, Arc<$(RwLock<)?dyn GameObject$(>)+, Arc<$t:ty>) => { 
14        {
15            let this = Arc::into_raw($a).cast::<$t>();
16            unsafe {Arc::from_raw(this)}
17        }
18    };
19    ($a:expr, Arc<$(RwLock<)?dyn Camera$(>)?>, Arc<$t:ty>) => {
20        {
21            let this = Arc::into_raw($a).cast::<$t>();
22            unsafe {Arc::from_raw(this)}
23        }
24    };
25    ($a:expr, Arc<$(RwLock<)?dyn Light$(>)?>, Arc<$t:ty>) => {
26        {
27            let this = Arc::into_raw($a).cast::<$t>();
28            unsafe {Arc::from_raw(this)}
29        }
30    };
31    ($a:expr, Arc<$(RwLock<)?dyn Any$(>)?>, Arc<$t:ty>) => {
32        {
33            let this = Arc::into_raw($a).cast::<$t>();
34            unsafe {Arc::from_raw(this)}
35        }
36    };
37}
38
39#[macro_export]
40macro_rules! upcast {
41    // TODO: warn do manually
42    ($a:expr, Arc<RwLock<dyn Camera>>, Arc<RwLock<dyn GameObject>>) => {
43        $a.read().unwrap().cast_gameobject_arc_rwlock($a);
44    };
45    ($a:expr, Arc<RwLock<dyn Light>>, Arc<RwLock<dyn GameObject>>) => {
46        $a.read().unwrap().cast_gameobject_arc_rwlock($a);
47    };
48    ($a:expr, Arc<RwLock<$t:ty>>, Arc<RwLock<dyn GameObject>>) => { 
49        { $a as Arc<RwLock<dyn GameObject>> }
50    };
51    ($a:expr, Arc<RwLock<$t:ty>>, Arc<RwLock<dyn Camera>>) => {
52        { $a as Arc<RwLock<dyn Camera>> }
53    };
54    ($a:expr, Arc<RwLock<$t:ty>>, Arc<RwLock<dyn Light>>) => {
55        { $a as Arc<RwLock<dyn Light>> }
56    };
57
58    ($a:expr, Arc<RwLock<$t:ty>>, Arc<dyn GameObject>) => { 
59        { $a as Arc<dyn GameObject> }
60    };
61    ($a:expr, Arc<$t:ty>, Arc<dyn Camera>) => { 
62        { $a as Arc<dyn Camera> }
63    };
64    ($a:expr, Arc<$t:ty>, Arc<dyn Light>) => { 
65        { $a as Arc<dyn Light> }
66    };
67}
feo_oop_engine/macros/cast_macro.rs

feo_oop_engine/macros/
cast_macro.rs
