From 199f264ad00ea7bd0b9e3cef5d6987776748c8c4 Mon Sep 17 00:00:00 2001
From: seth <yesifan66@qq.com>
Date: Tue, 22 Jun 2021 18:30:30 +0800
Subject: [PATCH] complete: generics
---
exercises/generics/generics1.rs | 4 +---
exercises/generics/generics2.rs | 10 +++++-----
exercises/generics/generics3.rs | 10 +++++-----
3 files changed, 11 insertions(+), 13 deletions(-)
diff --git a/exercises/generics/generics1.rs b/exercises/generics/generics1.rs
index f93e64a..59432e0 100644
--- a/exercises/generics/generics1.rs
+++ b/exercises/generics/generics1.rs
@@ -3,9 +3,7 @@
// Execute `rustlings hint generics1` for hints!
-// I AM NOT DONE
-
fn main() {
- let mut shopping_list: Vec<?> = Vec::new();
+ let mut shopping_list: Vec<&str> = Vec::new();
shopping_list.push("milk");
}
diff --git a/exercises/generics/generics2.rs b/exercises/generics/generics2.rs
index 1501529..4ffbae1 100644
--- a/exercises/generics/generics2.rs
+++ b/exercises/generics/generics2.rs
@@ -3,14 +3,14 @@
// Execute `rustlings hint generics2` for hints!
-// I AM NOT DONE
-struct Wrapper {
- value: u32,
+
+struct Wrapper<T> {
+ value: T,
}
-impl Wrapper {
- pub fn new(value: u32) -> Self {
+impl<T> Wrapper<T> {
+ pub fn new(value: T) -> Self {
Wrapper { value }
}
}
diff --git a/exercises/generics/generics3.rs b/exercises/generics/generics3.rs
index 64dd9bc..3814793 100644
--- a/exercises/generics/generics3.rs
+++ b/exercises/generics/generics3.rs
@@ -10,15 +10,15 @@
// Execute 'rustlings hint generics3' for hints!
-// I AM NOT DONE
+use std::fmt::Display;
-pub struct ReportCard {
- pub grade: f32,
+pub struct ReportCard<T: Display> {
+ pub grade: T,
pub student_name: String,
pub student_age: u8,
}
-impl ReportCard {
+impl<T: Display> ReportCard<T> {
pub fn print(&self) -> String {
format!("{} ({}) - achieved a grade of {}",
&self.student_name, &self.student_age, &self.grade)
@@ -46,7 +46,7 @@ mod tests {
fn generate_alphabetic_report_card() {
// TODO: Make sure to change the grade here after you finish the exercise.
let report_card = ReportCard {
- grade: 2.1,
+ grade: "A+",
student_name: "Gary Plotter".to_string(),
student_age: 11,
};