feat: Enumerated implementation for bool

Author: Pscheidl

enum-collections/Cargo.toml

@@ -20,6 +20,8 @@ debug = ["variants"] # Array of all variants must be available at runtime to gen
 eq = []
 # Generates a static array of all variants for the EnumMap. This is required for the `Debug` implementation.
 variants = ["enum-collections-macros/variants"]
+# Implementations of the `Enumerated` trait for common data types.
+ext=[]
 
 [dependencies]
 enum-collections-macros = { path = "../enum-collections-macros", version = "1.0.0" }

enum-collections/src/ext.rs

@@ -0,0 +1,37 @@
+//! Implementations of the [Enumerated] trait for common data types.
+
+use crate::Enumerated;
+
+impl Enumerated for bool {
+    const SIZE: usize = 2;
+    const VARIANTS: &'static [Self] = &[false, true];
+
+    fn position(self) -> usize {
+        self as usize
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::{em_default, EnumMap, Enumerated};
+
+    #[test]
+    fn test_bool() {
+        assert_eq!(0, false.position());
+        assert_eq!(1, true.position());
+        assert_eq!(2, bool::SIZE);
+
+        let map = EnumMap::<bool, i32, { bool::SIZE }>::new_inspect(|variant| match variant {
+            false => 42,
+            true => 24,
+        });
+
+        assert_eq!(42, map[false]);
+        assert_eq!(24, map[true]);
+
+        let map = em_default!(bool, i32,);
+        for variant in bool::VARIANTS {
+            assert_eq!(0, map[*variant]);
+        }
+    }
+}

enum-collections/src/lib.rs

@@ -17,6 +17,8 @@
 //!
 mod enumerated;
 mod enummap;
+#[cfg(feature = "ext")]
+mod ext;
 
 pub use crate::enumerated::Enumerated;
 pub use crate::enummap::EnumMap;