tune explanation of PhantomData ownership annotation

[rust-101.git] / workspace / src / part00.rs

diff --git a/workspace/src/part00.rs b/workspace/src/part00.rs
index 4f7b403b4ee7cfa60a6987acde6744528faf1778..49e89eba228a982b520db13ed69f65339984f03b 100644 (file)
--- a/workspace/src/part00.rs
+++ b/workspace/src/part00.rs
@@ -1,5 +1,3 @@
-// ***Remember to enable/add this part in `main.rs`!***
-

 // Rust-101, Part 00: Algebraic datatypes
 // ======================================
 
 // Rust-101, Part 00: Algebraic datatypes
 // ======================================
 


@@ -17,8 +15,7 @@ enum NumberOrNothing {
 fn vec_min(vec: Vec<i32>) -> NumberOrNothing {
     let mut min = NumberOrNothing::Nothing;
 
 fn vec_min(vec: Vec<i32>) -> NumberOrNothing {
     let mut min = NumberOrNothing::Nothing;
 

-    // Now we want to *iterate* over the list. Rust has some nice syntax for
-    // iterators:
+    // Now we want to *iterate* over the list. Rust has some nice syntax for iterators:

     for el in vec {
         // So `el` is al element of the list. We need to update `min` accordingly, but how do we get the current
         // number in there? This is what pattern matching can do:
     for el in vec {
         // So `el` is al element of the list. We need to update `min` accordingly, but how do we get the current
         // number in there? This is what pattern matching can do:


@@ -27,8 +24,7 @@ fn vec_min(vec: Vec<i32>) -> NumberOrNothing {
             NumberOrNothing::Nothing => {
                 unimplemented!()
             },
             NumberOrNothing::Nothing => {
                 unimplemented!()
             },

-            // In this arm, `min` is currently the number `n`, so let's compute the new minimum and store it. We will write
-            // the function `min_i32` just after we completed this one.
+            // In this arm, `min` is currently the number `n`, so let's compute the new minimum and store it.

             NumberOrNothing::Number(n) => {
                 unimplemented!()
             }
             NumberOrNothing::Number(n) => {
                 unimplemented!()
             }


@@ -58,22 +54,14 @@ use self::NumberOrNothing::{Number,Nothing};
 // To call this function, we now just need a list. Of course, ultimately we want to ask the user for
 // a list of numbers, but for now, let's just hard-code something.
 
 // To call this function, we now just need a list. Of course, ultimately we want to ask the user for
 // a list of numbers, but for now, let's just hard-code something.
 

-// `vec!` is a *macro* (as you can tell from the `!`) that constructs a constant `Vec<_>` with the given
-// elements.

 fn read_vec() -> Vec<i32> {
 fn read_vec() -> Vec<i32> {

-    vec![18,5,7,1,9,27]
+    unimplemented!()

 }
 
 }
 

-// Finally, let's call our functions and run the code!
-// But, wait, we would like to actually see something, so we need to print the result.
-// Of course Rust can print numbers, but after calling `vec_min`, we have a `NumberOrNothing`.
-// So let's write a small helper function that prints such values.
+// Of course, we would also like to actually see the result of the computation, so we need to print the result.

 
 fn print_number_or_nothing(n: NumberOrNothing) {
 
 fn print_number_or_nothing(n: NumberOrNothing) {

-    match n {
-        Nothing => println!("The number is: <nothing>"),
-        Number(n) => println!("The number is: {}", n),
-    };
+    unimplemented!()

 }
 
 // Putting it all together:
 }
 
 // Putting it all together:


@@ -83,7 +71,6 @@ pub fn main() {
     print_number_or_nothing(min);
 }
 
     print_number_or_nothing(min);
 }
 

-// Now try `cargo run` on the console to run above code.
+// Finally, try `cargo run` on the console to run it.

 
 
 
 

-// [index](main.html) | previous | [next](part01.html)