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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/traits/bound/in-arc.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/test/ui/traits/bound/in-arc.rs | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/src/test/ui/traits/bound/in-arc.rs b/src/test/ui/traits/bound/in-arc.rs new file mode 100644 index 000000000..a1492c0b9 --- /dev/null +++ b/src/test/ui/traits/bound/in-arc.rs @@ -0,0 +1,108 @@ +// run-pass +#![allow(unused_must_use)] +// Tests that a heterogeneous list of existential `dyn` types can be put inside an Arc +// and shared between threads as long as all types fulfill Send. + +// ignore-emscripten no threads support + +use std::sync::Arc; +use std::sync::mpsc::channel; +use std::thread; + +trait Pet { + fn name(&self, blk: Box<dyn FnMut(&str)>); + fn num_legs(&self) -> usize; + fn of_good_pedigree(&self) -> bool; +} + +struct Catte { + num_whiskers: usize, + name: String, +} + +struct Dogge { + bark_decibels: usize, + tricks_known: usize, + name: String, +} + +struct Goldfyshe { + swim_speed: usize, + name: String, +} + +impl Pet for Catte { + fn name(&self, mut blk: Box<dyn FnMut(&str)>) { blk(&self.name) } + fn num_legs(&self) -> usize { 4 } + fn of_good_pedigree(&self) -> bool { self.num_whiskers >= 4 } +} +impl Pet for Dogge { + fn name(&self, mut blk: Box<dyn FnMut(&str)>) { blk(&self.name) } + fn num_legs(&self) -> usize { 4 } + fn of_good_pedigree(&self) -> bool { + self.bark_decibels < 70 || self.tricks_known > 20 + } +} +impl Pet for Goldfyshe { + fn name(&self, mut blk: Box<dyn FnMut(&str)>) { blk(&self.name) } + fn num_legs(&self) -> usize { 0 } + fn of_good_pedigree(&self) -> bool { self.swim_speed >= 500 } +} + +pub fn main() { + let catte = Catte { num_whiskers: 7, name: "alonzo_church".to_string() }; + let dogge1 = Dogge { + bark_decibels: 100, + tricks_known: 42, + name: "alan_turing".to_string(), + }; + let dogge2 = Dogge { + bark_decibels: 55, + tricks_known: 11, + name: "albert_einstein".to_string(), + }; + let fishe = Goldfyshe { + swim_speed: 998, + name: "alec_guinness".to_string(), + }; + let arc = Arc::new(vec![ + Box::new(catte) as Box<dyn Pet+Sync+Send>, + Box::new(dogge1) as Box<dyn Pet+Sync+Send>, + Box::new(fishe) as Box<dyn Pet+Sync+Send>, + Box::new(dogge2) as Box<dyn Pet+Sync+Send>]); + let (tx1, rx1) = channel(); + let arc1 = arc.clone(); + let t1 = thread::spawn(move|| { check_legs(arc1); tx1.send(()); }); + let (tx2, rx2) = channel(); + let arc2 = arc.clone(); + let t2 = thread::spawn(move|| { check_names(arc2); tx2.send(()); }); + let (tx3, rx3) = channel(); + let arc3 = arc.clone(); + let t3 = thread::spawn(move|| { check_pedigree(arc3); tx3.send(()); }); + rx1.recv(); + rx2.recv(); + rx3.recv(); + t1.join(); + t2.join(); + t3.join(); +} + +fn check_legs(arc: Arc<Vec<Box<dyn Pet+Sync+Send>>>) { + let mut legs = 0; + for pet in arc.iter() { + legs += pet.num_legs(); + } + assert!(legs == 12); +} +fn check_names(arc: Arc<Vec<Box<dyn Pet+Sync+Send>>>) { + for pet in arc.iter() { + pet.name(Box::new(|name| { + assert!(name.as_bytes()[0] == 'a' as u8 && name.as_bytes()[1] == 'l' as u8); + })) + } +} +fn check_pedigree(arc: Arc<Vec<Box<dyn Pet+Sync+Send>>>) { + for pet in arc.iter() { + assert!(pet.of_good_pedigree()); + } +} |