68989918d2
In 8f5b5f94dc, `default::Default` was
added to the prelude, so these imports are no longer necessary.
59 lines
1.6 KiB
Rust
59 lines
1.6 KiB
Rust
// Copyright 2012 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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//! Operations on tuples
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//!
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//! To access the _N_-th element of a tuple one can use `N` itself
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//! as a field of the tuple.
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//!
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//! Indexing starts from zero, so `0` returns first value, `1`
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//! returns second value, and so on. In general, a tuple with _S_
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//! elements provides aforementioned fields from `0` to `S-1`.
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//!
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//! If every type inside a tuple implements one of the following
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//! traits, then a tuple itself also implements it.
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//!
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//! * `Clone`
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//! * `PartialEq`
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//! * `Eq`
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//! * `PartialOrd`
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//! * `Ord`
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//! * `Default`
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//!
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//! # Examples
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//!
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//! Accessing elements of a tuple at specified indices:
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//!
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//! ```
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//! let x = ("colorless", "green", "ideas", "sleep", "furiously");
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//! assert_eq!(x.3, "sleep");
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//!
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//! let v = (3, 3);
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//! let u = (1, -5);
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//! assert_eq!(v.0 * u.0 + v.1 * u.1, -12);
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//! ```
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//!
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//! Using traits implemented for tuples:
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//!
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//! ```
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//! let a = (1, 2);
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//! let b = (3, 4);
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//! assert!(a != b);
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//!
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//! let c = b.clone();
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//! assert!(b == c);
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//!
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//! let d : (u32, f32) = Default::default();
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//! assert_eq!(d, (0, 0.0f32));
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//! ```
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#![doc(primitive = "tuple")]
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#![stable(feature = "rust1", since = "1.0.0")]
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