Added macro to generate cast traits and impls automatically

Cargo.lock

@@ -29,6 +29,7 @@ version = "0.1.0"
 dependencies = [
  "dotenv",
  "google-home",
+ "paste",
  "rumqttc",
  "serde",
  "serde_json",
@@ -492,6 +493,12 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ff011a302c396a5197692431fc1948019154afc178baf7d8e37367442a4601cf"
 
+[[package]]
+name = "paste"
+version = "1.0.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf1c2c742266c2f1041c914ba65355a83ae8747b05f208319784083583494b4b"
+
 [[package]]
 name = "pin-project"
 version = "1.0.12"

Cargo.toml

@@ -11,3 +11,7 @@ serde = { version ="1.0.149", features = ["derive"] }
 serde_json = "1.0.89"
 dotenv = "0.15.0"
 google-home = {path = "./google-home"}
+paste = "1.0.10"
+
+[profile.release]
+lto=true

src/devices.rs

@@ -6,39 +6,31 @@ use crate::{mqtt::Listener, state::StateOnOff};
 
 pub use self::ikea_outlet::IkeaOutlet;
 
-pub trait AsListener {
-    fn cast(&self) -> Option<&dyn Listener> {
-        None
-    }
-    fn cast_mut(&mut self) -> Option<&mut dyn Listener> {
-        None
-    }
-}
-impl<T: Device + Listener> AsListener for T {
-    fn cast(&self) -> Option<&dyn Listener> {
-        Some(self)
-    }
-    fn cast_mut(&mut self) -> Option<&mut dyn Listener> {
-        Some(self)
-    }
+macro_rules! add_cast_for {
+    ($i:ident) => {
+        paste::paste! {
+            pub trait [< As $i>] {
+                fn cast(&self) -> Option<&dyn $i> {
+                    None
+                }
+                fn cast_mut(&mut self) -> Option<&mut dyn $i> {
+                    None
+                }
+            }
+            impl<T: $i> [< As $i>] for T {
+                fn cast(&self) -> Option<&dyn $i> {
+                    Some(self)
+                }
+                fn cast_mut(&mut self) -> Option<&mut dyn $i> {
+                    Some(self)
+                }
+            }
+        }
+    };
 }
 
-pub trait AsStateOnOff {
-    fn cast(&self) -> Option<&dyn StateOnOff> {
-        None
-    }
-    fn cast_mut(&mut self) -> Option<&mut dyn StateOnOff> {
-        None
-    }
-}
-impl<T: Device + StateOnOff> AsStateOnOff for T {
-    fn cast(&self) -> Option<&dyn StateOnOff> {
-        Some(self)
-    }
-    fn cast_mut(&mut self) -> Option<&mut dyn StateOnOff> {
-        Some(self)
-    }
-}
+add_cast_for!(Listener);
+add_cast_for!(StateOnOff);
 
 pub trait Device: AsListener + AsStateOnOff {
     fn get_identifier(&self) -> &str;