3

Author: ctrlshiftm129

exercises/conversions/as_ref_mut.rs

@@ -7,25 +7,23 @@
 // Execute `rustlings hint as_ref_mut` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
-
 // Obtain the number of bytes (not characters) in the given argument.
 // TODO: Add the AsRef trait appropriately as a trait bound.
-fn byte_counter<T>(arg: T) -> usize {
+fn byte_counter<T: AsRef<str>>(arg: T) -> usize {
     arg.as_ref().as_bytes().len()
 }
 
 // Obtain the number of characters (not bytes) in the given argument.
 // TODO: Add the AsRef trait appropriately as a trait bound.
-fn char_counter<T>(arg: T) -> usize {
+fn char_counter<T: AsRef<str>>(arg: T) -> usize {
     arg.as_ref().chars().count()
 }
 
 // Squares a number using as_mut().
 // TODO: Add the appropriate trait bound.
-fn num_sq<T>(arg: &mut T) {
+fn num_sq<T: AsMut<u32>>(arg: &mut T) {
     // TODO: Implement the function body.
-    ???
+    *arg.as_mut() = (*arg.as_mut()).pow(2);
 }
 
 #[cfg(test)]

exercises/tests/Cargo.lock

@@ -0,0 +1,7 @@
+[package]
+name = "tests8"
+version = "0.0.1"
+edition = "2021"
+[[bin]]
+name = "tests8"
+path = "tests8.rs"

exercises/tests/Cargo.toml

@@ -10,15 +10,12 @@ fn main() {
         .duration_since(std::time::UNIX_EPOCH)
         .unwrap()
         .as_secs(); // What's the use of this timestamp here?
-    let your_command = format!(
-        "Your command here with {}, please checkout exercises/tests/build.rs",
-        timestamp
-    );
+    let your_command = format!("rustc-env=TEST_FOO={}", timestamp);
     println!("cargo:{}", your_command);
 
     // In tests8, we should enable "pass" feature to make the
     // testcase return early. Fill in the command to tell
     // Cargo about that.
-    let your_command = "Your command here, please checkout exercises/tests/build.rs";
+    let your_command = "rustc-cfg=feature=\"pass\"";
     println!("cargo:{}", your_command);
-}
+}

exercises/tests/build.rs

@@ -22,8 +22,6 @@
 // Execute `rustlings hint tests5` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
-
 /// # Safety
 ///
 /// The `address` must contain a mutable reference to a valid `u32` value.
@@ -32,7 +30,7 @@ unsafe fn modify_by_address(address: usize) {
     // code's behavior and the contract of this function. You may use the
     // comment of the test below as your format reference.
     unsafe {
-        todo!("Your code goes here")
+        *(address as *mut u32) = 0xAABBCCDD;
     }
 }
 

exercises/tests/tests5.rs

@@ -7,7 +7,6 @@
 // Execute `rustlings hint tests6` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
 
 struct Foo {
     a: u128,
@@ -20,8 +19,9 @@ struct Foo {
 unsafe fn raw_pointer_to_box(ptr: *mut Foo) -> Box<Foo> {
     // SAFETY: The `ptr` contains an owned box of `Foo` by contract. We
     // simply reconstruct the box from that pointer.
-    let mut ret: Box<Foo> = unsafe { ??? };
-    todo!("The rest of the code goes here")
+    let mut ret: Box<Foo> = unsafe { Box::from_raw(ptr) };
+    ret.b = Some("hello".to_owned());
+    ret
 }
 
 #[cfg(test)]

exercises/tests/tests6.rs

@@ -34,8 +34,6 @@
 // Execute `rustlings hint tests7` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
-
 fn main() {}
 
 #[cfg(test)]

exercises/tests/tests7.rs

@@ -7,8 +7,6 @@
 // Execute `rustlings hint tests8` or use the `hint` watch subcommand for a
 // hint.
 
-// I AM NOT DONE
-
 fn main() {}
 
 #[cfg(test)]

exercises/tests/tests8.rs

@@ -1,6 +1,42 @@
-impl AppendBar for Vec<String> {
-    fn append_bar(mut self) -> Self {
-        self.push(String::from("Bar"));
-        self
+// traits3.rs
+//
+// Your task is to implement the Licensed trait for both structures and have
+// them return the same information without writing the same function twice.
+//
+// Consider what you can add to the Licensed trait.
+//
+// Execute `rustlings hint traits3` or use the `hint` watch subcommand for a
+// hint.
+
+pub trait Licensed {
+    fn licensing_info(&self) -> String {
+        String::from("Some information")
+    }
+}
+
+struct SomeSoftware {
+    version_number: i32,
+}
+
+struct OtherSoftware {
+    version_number: String,
+}
+
+impl Licensed for SomeSoftware {} // Don't edit this line
+impl Licensed for OtherSoftware {} // Don't edit this line
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn is_licensing_info_the_same() {
+        let licensing_info = String::from("Some information");
+        let some_software = SomeSoftware { version_number: 1 };
+        let other_software = OtherSoftware {
+            version_number: "v2.0.0".to_string(),
+        };
+        assert_eq!(some_software.licensing_info(), licensing_info);
+        assert_eq!(other_software.licensing_info(), licensing_info);
     }
 }