bench_refcell.rs

extern crate test;

use std::cell::{RefCell, UnsafeCell};
use std::rc::Rc;
use test::Bencher;

struct Foo {
    name: String
}

impl Foo {
   fn set_name(&mut self, s: String) { self.name = s; }
}

#[bench]
fn rc_refcell(b: &mut Bencher) {
   let r1 = Rc::new(RefCell::new(Foo { name: "aaa".to_string() }));
   let r2 = r1.clone();
   b.iter(|| {
       r1.borrow_mut().set_name("Foo".to_string());
       r2.borrow_mut().set_name("Bar".to_string());
   });
}

#[bench]
fn rc_unsafecell(b: &mut Bencher) {
   let r1 = Rc::new(UnsafeCell::new(Foo { name: "aaa".to_string() }));
   let r2 = r1.clone();
   b.iter(|| unsafe {
       (*r1.get()).set_name("Foo".to_string());
       (*r2.get()).set_name("Bar".to_string());
   });
}

#[bench]
fn ref_refcell(b: &mut Bencher) {
   let r = RefCell::new(Foo { name: "aaa".to_string() });
   let r1 = &r;
   let r2 = &r;
   b.iter(|| {
       r1.borrow_mut().set_name("Foo".to_string());
       r2.borrow_mut().set_name("Bar".to_string());
   });
}

#[bench]
fn ref_unsafecell(b: &mut Bencher) {
   let r = UnsafeCell::new(Foo { name: "aaa".to_string() });
   let r1 = &r;
   let r2 = &r;
   b.iter(|| unsafe {
       (*r1.get()).set_name("Foo".to_string());
       (*r2.get()).set_name("Bar".to_string());
   });
}


fn main() {
    println!("Hello, world!");
}