66 lines
2.2 KiB
Rust
66 lines
2.2 KiB
Rust
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// Copyright 2012-2013-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use std::borrow::Cow;
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// check that Cow<'a, str> implements addition
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#[test]
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fn check_cow_add() {
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borrowed1 = Cow::Borrowed("Hello, ");
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borrowed2 = Cow::Borrowed("World!");
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borrow_empty = Cow::Borrowed("");
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owned1 = Cow::Owned("Hi, ".into());
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owned2 = Cow::Owned("Rustaceans!".into());
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owned_empty = Cow::Owned("".into());
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assert_eq!("Hello, World!", borrowed1 + borrowed2);
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assert_eq!("Hello, Rustaceans!", borrowed1 + owned2);
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assert_eq!("Hello, World!", owned1 + borrowed2);
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assert_eq!("Hello, Rustaceans!", owned1 + owned2);
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if let Cow::Owned(_) = borrowed1 + borrow_empty {
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panic!("Adding empty strings to a borrow should note allocate");
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}
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if let Cow::Owned(_) = borrow_empty + borrowed1 {
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panic!("Adding empty strings to a borrow should note allocate");
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}
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if let Cow::Owned(_) = borrowed1 + owned_empty {
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panic!("Adding empty strings to a borrow should note allocate");
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}
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if let Cow::Owned(_) = owned_empty + borrowed1 {
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panic!("Adding empty strings to a borrow should note allocate");
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}
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}
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fn check_cow_add_assign() {
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borrowed1 = Cow::Borrowed("Hello, ");
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borrowed2 = Cow::Borrowed("World!");
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borrow_empty = Cow::Borrowed("");
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owned1 = Cow::Owned("Hi, ".into());
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owned2 = Cow::Owned("Rustaceans!".into());
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owned_empty = Cow::Owned("".into());
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let borrowed1clone = borrowed1.clone();
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borrowed1clone += borrow_empty;
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assert_eq!((&borrowed1clone).as_ptr(), (&borrowed1).as_ptr());
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borrowed1clone += owned_empty;
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assert_eq!((&borrowed1clone).as_ptr(), (&borrowed1).as_ptr());
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owned1 += borrowed2;
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borrowed1 += owned2;
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assert_eq!("Hello, World!", owned1);
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assert_eq!("Hello, Rustaceans!", borrowed1);
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}
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