19_concepts_Avoid_reflection

Cargo.toml

@@ -70,6 +70,8 @@ bin = [
   { name = "1_required_and_default_methods_sol", path = "solutions/13_traits_Use_default_implementations_to_minimize_required_trait_methods/1_required_and_default_methods.rs" },
   { name = "1_hint_for_panic", path = "exercises/18_concepts_Dont_panic/1_hint_for_panic.rs" },
   { name = "1_hint_for_panic_sol", path = "solutions/18_concepts_Dont_panic/1_hint_for_panic.rs" },
+  { name = "1_check_unique_id", path = "exercises/19_concepts_Avoid_reflection/1_check_unique_id.rs" },
+  { name = "1_check_unique_id_sol", path = "solutions/19_concepts_Avoid_reflection/1_check_unique_id.rs" },
 ]
 
 [package]

exercises/19_concepts_Avoid_reflection/1_check_unique_id.rs

@@ -0,0 +1,17 @@
+use std::any::Any;
+
+// TODO: TにAnyトレイト境界を設けて、グローバルにユニークな識別子(数値)を出力するようにしてください。
+fn print_type_id<T>(value: &T) {
+    let type_id;
+    let type_id = println!("The TypeId of the value is: {:?}", type_id);
+}
+
+fn main() {
+    let value1 = 42;
+    let value2 = "Hello, Rust!";
+    let value3 = 3.14;
+
+    print_type_id(&value1);
+    print_type_id(&value2);
+    print_type_id(&value3);
+}

info.toml

@@ -256,3 +256,10 @@ dir = "18_concepts_Dont_panic"
 test = true
 hint = """Rustではパニック処理を適切に扱う方法を学びます。適切なエラーハンドリングを実装して、安全なコードを書く方法を確認しましょう。"""
 skip_check_unsolved = false
+
+[[exercises]]
+name = "1_check_unique_id"
+dir = "19_concepts_Avoid_reflection"
+test = false
+hint = """リフレクションを避けつつ、一意のIDを確認する方法を学びます。"""
+skip_check_unsolved = false

solutions/19_concepts_Avoid_reflection/1_check_unique_id.rs

@@ -0,0 +1,16 @@
+use std::any::Any;
+
+fn print_type_id<T: Any>(value: &T) {
+    let type_id = value.type_id();
+    println!("The TypeId of the value is: {:?}", type_id);
+}
+
+fn main() {
+    let value1 = 42;
+    let value2 = "Hello, Rust!";
+    let value3 = 2.468;
+
+    print_type_id(&value1);
+    print_type_id(&value2);
+    print_type_id(&value3);
+}