Auto-PR: Dev to Master

src/bin/20b_operator_overloading.rs

@@ -86,6 +86,11 @@ fn main() -> Result<(), Box<dyn Error>> {
     let _b = a[0];
 
     println!("A = {a:?}");
+    // not all operators can be overloaded in python
+    // & is always a reference
+    // && || are limited to boolean values
+    // .., ..= always create a range struct
+    // = is the assignment operator, which copies or moves a value
 
     Ok(())
 }

src/bin/41_utility_traits.rs

@@ -0,0 +1,39 @@
+fn main() {
+    // Traits, Description
+    // Drop: Clean up code rust runs automatically when a value is dropped
+    // Size: marker trait for types with a known size at compile time as opposed to dynamically sized types (slices)
+    // Clone: type that support cloning
+    // Copy: Marker trait for types that can be cloned by moving byte-for-byte copy of memory containing the value
+    // Deref, DerefMut: Trait for smart pointers
+    // Default: types that have a sensible default value
+    // ToOwned: Conversion trait for converting a reference to an owned value
+    // From, Into: Conversion trait for converting from one type to another
+    // TryFrom, TryInto, Same as above, but might fail
+    //
+
+    // Drop
+    // you can customize how run process dropping of types by implementing Drop for your type
+
+    #[derive(Debug)]
+    struct Person {
+        name: String,
+    }
+
+    impl Drop for Person {
+        fn drop(&mut self) {
+            println!("Dropping Person")
+        }
+    }
+
+    let brian = Person {
+        name: "Brian".to_string(),
+    };
+    println!("brian: {brian:?}");
+    println!("person name: {:?}", brian.name);
+    // rust calls the drop trait of a type if it implement the Drop trait
+    // and then after that drops the value, so the value is not dropped in the drop
+    // method of the Drop trait but some other logic can happen there
+
+    // if a variable value is moved into another variable, when the variable goes out of scope
+    // rust will not try to drop it, since it does not contain any value
+}