diff options
Diffstat (limited to 'src/test/ui/run-pass/traits/trait-generic.rs')
| -rw-r--r-- | src/test/ui/run-pass/traits/trait-generic.rs | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/src/test/ui/run-pass/traits/trait-generic.rs b/src/test/ui/run-pass/traits/trait-generic.rs new file mode 100644 index 00000000000..eadda5dfe29 --- /dev/null +++ b/src/test/ui/run-pass/traits/trait-generic.rs @@ -0,0 +1,53 @@ +// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT +// file at the top-level directory of this distribution and at +// http://rust-lang.org/COPYRIGHT. +// +// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or +// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license +// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your +// option. This file may not be copied, modified, or distributed +// except according to those terms. + + + + +trait to_str { + fn to_string_(&self) -> String; +} +impl to_str for isize { + fn to_string_(&self) -> String { self.to_string() } +} +impl to_str for String { + fn to_string_(&self) -> String { self.clone() } +} +impl to_str for () { + fn to_string_(&self) -> String { "()".to_string() } +} + +trait map<T> { + fn map<U, F>(&self, f: F) -> Vec<U> where F: FnMut(&T) -> U; +} +impl<T> map<T> for Vec<T> { + fn map<U, F>(&self, mut f: F) -> Vec<U> where F: FnMut(&T) -> U { + let mut r = Vec::new(); + for i in self { + r.push(f(i)); + } + r + } +} + +fn foo<U, T: map<U>>(x: T) -> Vec<String> { + x.map(|_e| "hi".to_string() ) +} +fn bar<U:to_str,T:map<U>>(x: T) -> Vec<String> { + x.map(|_e| _e.to_string_() ) +} + +pub fn main() { + assert_eq!(foo(vec![1]), ["hi".to_string()]); + assert_eq!(bar::<isize, Vec<isize> >(vec![4, 5]), ["4".to_string(), "5".to_string()]); + assert_eq!(bar::<String, Vec<String> >(vec!["x".to_string(), "y".to_string()]), + ["x".to_string(), "y".to_string()]); + assert_eq!(bar::<(), Vec<()>>(vec![()]), ["()".to_string()]); +} |
