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Add smart_pointers example

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This commit is contained in:
Timothy Warren 2019-02-05 10:10:47 -05:00
parent ca6840cec2
commit 9b0fff8c9f
5 changed files with 123 additions and 117 deletions
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1
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@ -24,6 +24,7 @@
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5
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@ -98,6 +98,10 @@
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171
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7
smart_pointers/Cargo.toml Normal file
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@ -0,0 +1,7 @@
[package]
name = "smart_pointers"
version = "0.1.0"
authors = ["Timothy Warren <twarren@nabancard.com>"]
edition = "2018"
[dependencies]

56
smart_pointers/src/main.rs Normal file
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@ -0,0 +1,56 @@
use std::ops::Deref;
use std::mem::drop;
struct MyBox<T>(T);
impl<T> MyBox<T> {
fn new(x: T) -> MyBox<T> {
MyBox(x)
}
}
impl<T> Deref for MyBox<T> {
type Target = T;
fn deref(&self) -> &T {
&self.0
}
}
struct CustomSmartPointer {
data: String,
}
impl Drop for CustomSmartPointer {
fn drop (&mut self) {
println!("Dropping CustomSmartPointer with data `{}`!", self.data);
}
}
fn hello(name: &str) {
println!("Hello, {}!", name);
}
fn main() {
let x = 5;
let y = MyBox::new(x);
assert_eq!(5, x);
assert_eq!(5, *y);
// Deref trait
let m = MyBox::new(String::from("Rust"));
hello(&m); // hello(&(*m)[..]); without deref coercions
// Drop trait
let c = CustomSmartPointer { data: String::from("my stuff") };
println!("CustomSmartPointer created.");
// Manual early "destruction" with std::mem::drop, instead of
// automatic cleanup via the Drop trait
drop(c);
println!("CustomSmartPointer dropped before the end of main.");
let _d = CustomSmartPointer { data: String::from("other stuff") };
println!("CustomSmartPointer created.");
}