add code

14.Generics/14.5 Multiple bounds/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "multiple_bounds"
+version = "0.1.0"

14.Generics/14.5 Multiple bounds/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "multiple_bounds"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

14.Generics/14.5 Multiple bounds/src/main.rs

@@ -0,0 +1,30 @@
+//!
+//! 多重泛型约束
+//! 多重约束可以在每个约束之间使用 `+` 号连接，
+//! 多个泛型之间使用 `,` 号间隔
+//!
+//! 同样支持在 `<T: bound + bound2>` 或者 where `T: bound + bound2` 中使用
+//!
+use std::fmt::{Debug, Display};
+
+fn compare_prints<T: Debug + Display>(t: &T) {
+    println!("Debug: `{:?}`", t);
+    println!("Display: `{}`", t);
+}
+
+fn compare_types<T: Debug, U: Debug>(t: &T, u: &U) {
+    println!("t: `{:?}`", t);
+    println!("u: `{:?}`", u);
+}
+
+fn main() {
+    let string = "words";
+    let array = [1, 2, 3];
+    let vec = vec![1, 2, 3];
+
+    compare_prints(&string);
+    // compare_prints(&array);
+    // TODO ^ 移除注释查看错误
+
+    compare_types(&array, &vec);
+}