2016-11-04 02:07:00 +01:00
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// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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2016-09-12 23:35:20 +02:00
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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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2016-11-04 02:07:00 +01:00
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fn check_cow_add_cow() {
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let borrowed1 = Cow::Borrowed("Hello, ");
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let borrowed2 = Cow::Borrowed("World!");
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let borrow_empty = Cow::Borrowed("");
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2016-09-12 23:35:20 +02:00
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2016-11-04 02:07:00 +01:00
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let owned1: Cow<str> = Cow::Owned(String::from("Hi, "));
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let owned2: Cow<str> = Cow::Owned(String::from("Rustaceans!"));
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let owned_empty: Cow<str> = Cow::Owned(String::new());
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2016-09-12 23:35:20 +02:00
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2016-11-04 02:07:00 +01:00
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assert_eq!("Hello, World!", borrowed1.clone() + borrowed2.clone());
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assert_eq!("Hello, Rustaceans!", borrowed1.clone() + owned2.clone());
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2016-09-12 23:35:20 +02:00
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2016-11-04 02:07:00 +01:00
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assert_eq!("Hi, World!", owned1.clone() + borrowed2.clone());
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assert_eq!("Hi, Rustaceans!", owned1.clone() + owned2.clone());
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2016-09-12 23:35:20 +02:00
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2016-11-04 02:07:00 +01:00
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if let Cow::Owned(_) = borrowed1.clone() + borrow_empty.clone() {
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2016-09-12 23:35:20 +02:00
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panic!("Adding empty strings to a borrow should note allocate");
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}
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2016-11-04 02:07:00 +01:00
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if let Cow::Owned(_) = borrow_empty.clone() + borrowed1.clone() {
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2016-09-12 23:35:20 +02:00
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panic!("Adding empty strings to a borrow should note allocate");
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}
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2016-11-04 02:07:00 +01:00
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if let Cow::Owned(_) = borrowed1.clone() + owned_empty.clone() {
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2016-09-12 23:35:20 +02:00
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panic!("Adding empty strings to a borrow should note allocate");
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}
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2016-11-04 02:07:00 +01:00
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if let Cow::Owned(_) = owned_empty.clone() + borrowed1.clone() {
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2016-09-12 23:35:20 +02:00
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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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2016-11-04 02:07:00 +01:00
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#[test]
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fn check_cow_add_str() {
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let borrowed = Cow::Borrowed("Hello, ");
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let borrow_empty = Cow::Borrowed("");
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let owned: Cow<str> = Cow::Owned(String::from("Hi, "));
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let owned_empty: Cow<str> = Cow::Owned(String::new());
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2016-09-12 23:35:20 +02:00
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2016-11-04 02:07:00 +01:00
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assert_eq!("Hello, World!", borrowed.clone() + "World!");
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2016-09-12 23:35:20 +02:00
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2016-11-04 02:07:00 +01:00
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assert_eq!("Hi, World!", owned.clone() + "World!");
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2016-09-12 23:35:20 +02:00
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2016-11-04 02:07:00 +01:00
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if let Cow::Owned(_) = borrowed.clone() + "" {
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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.clone() + "Hello, " {
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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.clone() + "Hello, " {
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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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#[test]
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fn check_cow_add_assign_cow() {
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let mut borrowed1 = Cow::Borrowed("Hello, ");
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let borrowed2 = Cow::Borrowed("World!");
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let borrow_empty = Cow::Borrowed("");
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let mut owned1: Cow<str> = Cow::Owned(String::from("Hi, "));
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let owned2: Cow<str> = Cow::Owned(String::from("Rustaceans!"));
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let owned_empty: Cow<str> = Cow::Owned(String::new());
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let mut s = borrowed1.clone();
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s += borrow_empty.clone();
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assert_eq!("Hello, ", s);
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if let Cow::Owned(_) = s {
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panic!("Adding empty strings to a borrow should note allocate");
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}
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let mut s = borrow_empty.clone();
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s += borrowed1.clone();
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assert_eq!("Hello, ", s);
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if let Cow::Owned(_) = s {
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panic!("Adding empty strings to a borrow should note allocate");
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}
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let mut s = borrowed1.clone();
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s += owned_empty.clone();
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assert_eq!("Hello, ", s);
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if let Cow::Owned(_) = s {
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panic!("Adding empty strings to a borrow should note allocate");
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}
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let mut s = owned_empty.clone();
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s += borrowed1.clone();
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assert_eq!("Hello, ", s);
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if let Cow::Owned(_) = s {
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panic!("Adding empty strings to a borrow should note allocate");
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}
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2016-09-12 23:35:20 +02:00
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owned1 += borrowed2;
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borrowed1 += owned2;
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2016-11-04 02:07:00 +01:00
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assert_eq!("Hi, World!", owned1);
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2016-09-12 23:35:20 +02:00
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assert_eq!("Hello, Rustaceans!", borrowed1);
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}
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2016-11-04 02:07:00 +01:00
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#[test]
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fn check_cow_add_assign_str() {
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let mut borrowed = Cow::Borrowed("Hello, ");
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let borrow_empty = Cow::Borrowed("");
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let mut owned: Cow<str> = Cow::Owned(String::from("Hi, "));
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let owned_empty: Cow<str> = Cow::Owned(String::new());
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let mut s = borrowed.clone();
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s += "";
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assert_eq!("Hello, ", s);
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if let Cow::Owned(_) = s {
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panic!("Adding empty strings to a borrow should note allocate");
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}
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let mut s = borrow_empty.clone();
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s += "World!";
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assert_eq!("World!", s);
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if let Cow::Owned(_) = s {
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panic!("Adding empty strings to a borrow should note allocate");
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}
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let mut s = owned_empty.clone();
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s += "World!";
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assert_eq!("World!", s);
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if let Cow::Owned(_) = s {
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panic!("Adding empty strings to a borrow should note allocate");
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}
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owned += "World!";
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borrowed += "World!";
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assert_eq!("Hi, World!", owned);
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assert_eq!("Hello, World!", borrowed);
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}
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2017-04-02 04:33:45 +02:00
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#[test]
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fn check_cow_clone_from() {
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let mut c1: Cow<str> = Cow::Owned(String::with_capacity(25));
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let s: String = "hi".to_string();
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assert!(s.capacity() < 25);
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let c2: Cow<str> = Cow::Owned(s);
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c1.clone_from(&c2);
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assert!(c1.into_owned().capacity() >= 25);
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}
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