ch10 ジェネリック型、トレイト、ライフタイムの和訳を最新版に更新

rust-lang/book@19c40bf

Author: shinmili

listings/ch10-generic-types-traits-and-lifetimes/listing-10-01/Cargo.toml

@@ -1,7 +1,6 @@
 [package]
 name = "chapter10"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]

listings/ch10-generic-types-traits-and-lifetimes/listing-10-01/src/main.rs

@@ -2,17 +2,18 @@
 fn main() {
     let number_list = vec![34, 50, 25, 100, 65];
 
-    let mut largest = number_list[0];
+    let mut largest = &number_list[0];
 
-    for number in number_list {
+    for number in &number_list {
         if number > largest {
             largest = number;
         }
     }
 
+    //       "最大値は{}です"
     println!("The largest number is {}", largest);
     // ANCHOR_END: here
-    assert_eq!(largest, 100);
+    assert_eq!(*largest, 100);
     // ANCHOR: here
 }
 // ANCHOR_END: here

listings/ch10-generic-types-traits-and-lifetimes/listing-10-02/Cargo.toml

@@ -1,7 +1,6 @@
 [package]
 name = "chapter10"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]

listings/ch10-generic-types-traits-and-lifetimes/listing-10-02/src/main.rs

@@ -1,9 +1,9 @@
 fn main() {
     let number_list = vec![34, 50, 25, 100, 65];
 
-    let mut largest = number_list[0];
+    let mut largest = &number_list[0];
 
-    for number in number_list {
+    for number in &number_list {
         if number > largest {
             largest = number;
         }
@@ -13,9 +13,9 @@ fn main() {
 
     let number_list = vec![102, 34, 6000, 89, 54, 2, 43, 8];
 
-    let mut largest = number_list[0];
+    let mut largest = &number_list[0];
 
-    for number in number_list {
+    for number in &number_list {
         if number > largest {
             largest = number;
         }

listings/ch10-generic-types-traits-and-lifetimes/listing-10-03/Cargo.toml

@@ -1,7 +1,6 @@
 [package]
 name = "chapter10"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]

listings/ch10-generic-types-traits-and-lifetimes/listing-10-03/src/main.rs

@@ -17,15 +17,15 @@ fn main() {
     let result = largest(&number_list);
     println!("The largest number is {}", result);
     // ANCHOR_END: here
-    assert_eq!(result, &100);
+    assert_eq!(*result, 100);
     // ANCHOR: here
 
     let number_list = vec![102, 34, 6000, 89, 54, 2, 43, 8];
 
     let result = largest(&number_list);
     println!("The largest number is {}", result);
     // ANCHOR_END: here
-    assert_eq!(result, &6000);
+    assert_eq!(*result, 6000);
     // ANCHOR: here
 }
 // ANCHOR_END: here

listings/ch10-generic-types-traits-and-lifetimes/listing-10-04/Cargo.toml

@@ -1,7 +1,6 @@
 [package]
 name = "chapter10"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]

listings/ch10-generic-types-traits-and-lifetimes/listing-10-04/src/main.rs

@@ -29,15 +29,15 @@ fn main() {
     let result = largest_i32(&number_list);
     println!("The largest number is {}", result);
     // ANCHOR_END: here
-    assert_eq!(result, &100);
+    assert_eq!(*result, 100);
     // ANCHOR: here
 
     let char_list = vec!['y', 'm', 'a', 'q'];
 
     let result = largest_char(&char_list);
     println!("The largest char is {}", result);
     // ANCHOR_END: here
-    assert_eq!(result, &'y');
+    assert_eq!(*result, 'y');
     // ANCHOR: here
 }
 // ANCHOR_END: here

listings/ch10-generic-types-traits-and-lifetimes/listing-10-05/Cargo.toml

@@ -1,7 +1,6 @@
 [package]
 name = "chapter10"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]

listings/ch10-generic-types-traits-and-lifetimes/listing-10-05/output.txt

@@ -1,18 +1,19 @@
 $ cargo run
    Compiling chapter10 v0.1.0 (file:///projects/chapter10)
-error[E0369]: binary operation `>` cannot be applied to type `T`
+error[E0369]: binary operation `>` cannot be applied to type `&T`
+(エラー: 2項演算`>`は、型`&T`に適用できません)
  --> src/main.rs:5:17
   |
 5 |         if item > largest {
-  |            ---- ^ ------- T
+  |            ---- ^ ------- &T
   |            |
-  |            T
+  |            &T
   |
-  = note: `T` might need a bound for `std::cmp::PartialOrd`
-
-error: aborting due to previous error
+help: consider restricting type parameter `T`
+(ヘルプ: 型引数`T`を制約することを考慮してください)
+  |
+1 | fn largest<T: std::cmp::PartialOrd>(list: &[T]) -> &T {
+  |             ++++++++++++++++++++++
 
 For more information about this error, try `rustc --explain E0369`.
-error: could not compile `chapter10`.
-
-To learn more, run the command again with --verbose.
+error: could not compile `chapter10` (bin "chapter10") due to 1 previous error