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
rust-lang-ja · shinmili · May 26, 2024 · Nov 28, 2024 · Dec 26, 2024 · May 26, 2024
commit 4e3d9ea278308a9d30b9d0f62c073322f9f136ff
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-01/Cargo.toml b/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]
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-01/src/main.rs b/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
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-02/Cargo.toml b/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]
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-02/src/main.rs b/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;
         }

diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-03/Cargo.toml b/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]
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-03/src/main.rs b/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
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-04/Cargo.toml b/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]
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-04/src/main.rs b/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
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-05/Cargo.toml b/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]
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-05/output.txt b/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
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-05/src/main.rs b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-05/src/main.rs
@@ -1,5 +1,5 @@
 fn largest<T>(list: &[T]) -> &T {
-    let mut largest = list[0];
+    let mut largest = &list[0];
 
     for item in list {
         if item > largest {

diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-06/Cargo.toml b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-06/Cargo.toml
@@ -1,7 +1,6 @@
 [package]
 name = "chapter10"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-07/Cargo.toml b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-07/Cargo.toml
@@ -1,7 +1,6 @@
 [package]
 name = "chapter10"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-07/output.txt b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-07/output.txt
@@ -1,14 +1,11 @@
 $ cargo run
    Compiling chapter10 v0.1.0 (file:///projects/chapter10)
 error[E0308]: mismatched types
+(エラー: 型が合いません)
  --> src/main.rs:7:38
   |
 7 |     let wont_work = Point { x: 5, y: 4.0 };
   |                                      ^^^ expected integer, found floating-point number
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0308`.
-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
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-08/Cargo.toml b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-08/Cargo.toml
@@ -1,7 +1,6 @@
 [package]
 name = "chapter10"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-09/Cargo.toml b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-09/Cargo.toml
@@ -1,7 +1,6 @@
 [package]
 name = "chapter10"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-10/Cargo.toml b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-10/Cargo.toml
@@ -1,7 +1,6 @@
 [package]
 name = "chapter10"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-11/Cargo.toml b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-11/Cargo.toml
@@ -1,7 +1,6 @@
 [package]
 name = "chapter10"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-11/src/main.rs b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-11/src/main.rs
@@ -1,10 +1,10 @@
-struct Point<T, U> {
-    x: T,
-    y: U,
+struct Point<X1, Y1> {
+    x: X1,
+    y: Y1,
 }
 
-impl<T, U> Point<T, U> {
-    fn mixup<V, W>(self, other: Point<V, W>) -> Point<T, W> {
+impl<X1, Y1> Point<X1, Y1> {
+    fn mixup<X2, Y2>(self, other: Point<X2, Y2>) -> Point<X1, Y2> {
         Point {
             x: self.x,
             y: other.y,

diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-12/Cargo.lock b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-12/Cargo.lock
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-12/Cargo.toml b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-12/Cargo.toml
@@ -1,7 +1,6 @@
 [package]
-name = "chapter10"
+name = "aggregator"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-13/Cargo.lock b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-13/Cargo.lock
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-13/Cargo.toml b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-13/Cargo.toml
@@ -1,7 +1,6 @@
 [package]
-name = "chapter10"
+name = "aggregator"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-14/Cargo.lock b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-14/Cargo.lock
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-14/Cargo.toml b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-14/Cargo.toml
@@ -1,7 +1,6 @@
 [package]
-name = "chapter10"
+name = "aggregator"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-15/Cargo.toml b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-15/Cargo.toml
@@ -1,7 +1,6 @@
 [package]
 name = "chapter10"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
diff --git a/...ts-and-lifetimes/listing-10-16/src/lib.rs → ...ts-and-lifetimes/listing-10-15/src/lib.rs b/...ts-and-lifetimes/listing-10-16/src/lib.rs → ...ts-and-lifetimes/listing-10-15/src/lib.rs
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-15/src/main.rs b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-15/src/main.rs
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-16/Cargo.toml b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-16/Cargo.toml
@@ -1,7 +1,6 @@
 [package]
 name = "chapter10"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-16/output.txt b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-16/output.txt
@@ -0,0 +1,22 @@
+$ cargo run
+   Compiling chapter10 v0.1.0 (file:///projects/chapter10)
+error[E0597]: `x` does not live long enough
+(エラー[E0597]: `x`の生存期間が短すぎます)
+ --> src/main.rs:6:13
+  |
+5 |         let x = 5;
+  |             - binding `x` declared here
+  |              (束縛`x`はここで宣言されています)
+6 |         r = &x;
+  |             ^^ borrowed value does not live long enough
+  |               (借用された値の生存期間が短すぎます)
+7 |     }
+  |     - `x` dropped here while still borrowed
+  |      (`x`は借用されている間にここでドロップされました)
+8 |
+9 |     println!("r: {}", r);
+  |                       - borrow later used here
+  |                        (その後、借用はここで使われています)
+
+For more information about this error, try `rustc --explain E0597`.
+error: could not compile `chapter10` (bin "chapter10") due to 1 previous error
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-16/src/main.rs b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-16/src/main.rs
@@ -0,0 +1,10 @@
+fn main() {
+    let r;
+
+    {
+        let x = 5;
+        r = &x;
+    }
+
+    println!("r: {}", r);
+}
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-17/Cargo.lock b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-17/Cargo.lock