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109 lines
2.9 KiB
Rust
109 lines
2.9 KiB
Rust
// run-pass
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#![allow(unused_must_use)]
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// Tests that a heterogeneous list of existential `dyn` types can be put inside an Arc
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// and shared between threads as long as all types fulfill Send.
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// ignore-emscripten no threads support
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use std::sync::Arc;
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use std::sync::mpsc::channel;
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use std::thread;
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trait Pet {
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fn name(&self, blk: Box<dyn FnMut(&str)>);
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fn num_legs(&self) -> usize;
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fn of_good_pedigree(&self) -> bool;
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}
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struct Catte {
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num_whiskers: usize,
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name: String,
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}
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struct Dogge {
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bark_decibels: usize,
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tricks_known: usize,
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name: String,
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}
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struct Goldfyshe {
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swim_speed: usize,
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name: String,
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}
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impl Pet for Catte {
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fn name(&self, mut blk: Box<dyn FnMut(&str)>) { blk(&self.name) }
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fn num_legs(&self) -> usize { 4 }
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fn of_good_pedigree(&self) -> bool { self.num_whiskers >= 4 }
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}
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impl Pet for Dogge {
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fn name(&self, mut blk: Box<dyn FnMut(&str)>) { blk(&self.name) }
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fn num_legs(&self) -> usize { 4 }
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fn of_good_pedigree(&self) -> bool {
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self.bark_decibels < 70 || self.tricks_known > 20
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}
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}
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impl Pet for Goldfyshe {
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fn name(&self, mut blk: Box<dyn FnMut(&str)>) { blk(&self.name) }
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fn num_legs(&self) -> usize { 0 }
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fn of_good_pedigree(&self) -> bool { self.swim_speed >= 500 }
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}
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pub fn main() {
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let catte = Catte { num_whiskers: 7, name: "alonzo_church".to_string() };
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let dogge1 = Dogge {
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bark_decibels: 100,
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tricks_known: 42,
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name: "alan_turing".to_string(),
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};
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let dogge2 = Dogge {
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bark_decibels: 55,
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tricks_known: 11,
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name: "albert_einstein".to_string(),
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};
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let fishe = Goldfyshe {
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swim_speed: 998,
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name: "alec_guinness".to_string(),
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};
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let arc = Arc::new(vec![
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Box::new(catte) as Box<dyn Pet+Sync+Send>,
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Box::new(dogge1) as Box<dyn Pet+Sync+Send>,
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Box::new(fishe) as Box<dyn Pet+Sync+Send>,
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Box::new(dogge2) as Box<dyn Pet+Sync+Send>]);
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let (tx1, rx1) = channel();
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let arc1 = arc.clone();
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let t1 = thread::spawn(move|| { check_legs(arc1); tx1.send(()); });
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let (tx2, rx2) = channel();
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let arc2 = arc.clone();
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let t2 = thread::spawn(move|| { check_names(arc2); tx2.send(()); });
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let (tx3, rx3) = channel();
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let arc3 = arc.clone();
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let t3 = thread::spawn(move|| { check_pedigree(arc3); tx3.send(()); });
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rx1.recv();
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rx2.recv();
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rx3.recv();
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t1.join();
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t2.join();
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t3.join();
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}
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fn check_legs(arc: Arc<Vec<Box<dyn Pet+Sync+Send>>>) {
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let mut legs = 0;
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for pet in arc.iter() {
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legs += pet.num_legs();
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}
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assert!(legs == 12);
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}
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fn check_names(arc: Arc<Vec<Box<dyn Pet+Sync+Send>>>) {
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for pet in arc.iter() {
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pet.name(Box::new(|name| {
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assert!(name.as_bytes()[0] == 'a' as u8 && name.as_bytes()[1] == 'l' as u8);
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}))
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}
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}
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fn check_pedigree(arc: Arc<Vec<Box<dyn Pet+Sync+Send>>>) {
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for pet in arc.iter() {
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assert!(pet.of_good_pedigree());
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}
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}
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