      1
      2
      3
      4
      5
      6
      7
      8
      9
     10
     11
     12
     13
     14
     15
     16
     17
     18
     19
     20
     21
     22
     23
     24
     25
     26
     27
     28
     29
     30
     31
     32
     33
     34
     35
     36
     37
     38
     39
     40
     41
     42
     43
     44
     45
     46
     47
     48
     49
     50
     51
     52
     53
     54
     55
     56
     57
     58
     59
     60
     61
     62
     63
     64
     65
     66
     67
     68
     69
     70
     71
     72
     73
     74
     75
     76
     77
     78
     79
     80
     81
     82
     83
     84
     85
     86
     87
     88
     89
     90
     91
     92
     93
     94
     95
     96
     97
     98
     99
    100
    101
    102
    103
    104
    105
    106
    107
    108
    109
    110
    111
    112
    113
    114
    115
    116
    117
    118
    119
    120
    121
    122
    123
    124
    125
    126
    127
    128
    129
    130
    131
    132
    133
    134
    135
    136
    137
    138
    139
    140
    141
    142
    143
    144
    145
    146
    147
    148
    149
    150
    151
    152
    153
    154
    155
    156
    157
    158
    159
    160
    161
    162
    163
    164
    165
    166
    167
    168
    169
    170
    171
    172
    173
    174
    175
    176
    177
    178
    179
    180
    181
    182
    183
    184
    185
    186
    187
    188
    189
    190
    191
    192
    193
    194
    195
    196
    197
    198
    199
    200
    201
    202
    203
    204
    205
    206
    207
    208
    209
    210
    211
    212
    213
    214
    215
    216
    217
    218
    219
    220
    221
    222
    223
    224
    225
    226
    227
    228
    229
    230
    231
    232
    233
    234
    235
    236
    237
    238
    239
    240
    241
    242
    243
    244
    245
    246
    247
    248
    249
    250
    251
    252
    253
    254
    255
    256
    257
    258
    259
    260
    261
    262
    263
    264
    265
    266
    267
    268
    269
    270
    271
    272

    // Copyright 2014-2017 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.

    //! # The Rust core allocation and collections library
    //!
    //! This library provides smart pointers and collections for managing
    //! heap-allocated values.
    //!
    //! This library, like libcore, is not intended for general usage, but rather as
    //! a building block of other libraries. The types and interfaces in this
    //! library are reexported through the [standard library](../std/index.html),
    //! and should not be used through this library.
    //!
    //! ## Boxed values
    //!
    //! The [`Box`](boxed/index.html) type is a smart pointer type. There can
    //! only be one owner of a `Box`, and the owner can decide to mutate the
    //! contents, which live on the heap.
    //!
    //! This type can be sent among threads efficiently as the size of a `Box` value
    //! is the same as that of a pointer. Tree-like data structures are often built
    //! with boxes because each node often has only one owner, the parent.
    //!
    //! ## Reference counted pointers
    //!
    //! The [`Rc`](rc/index.html) type is a non-threadsafe reference-counted pointer
    //! type intended for sharing memory within a thread. An `Rc` pointer wraps a
    //! type, `T`, and only allows access to `&T`, a shared reference.
    //!
    //! This type is useful when inherited mutability (such as using `Box`) is too
    //! constraining for an application, and is often paired with the `Cell` or
    //! `RefCell` types in order to allow mutation.
    //!
    //! ## Atomically reference counted pointers
    //!
    //! The [`Arc`](arc/index.html) type is the threadsafe equivalent of the `Rc`
    //! type. It provides all the same functionality of `Rc`, except it requires
    //! that the contained type `T` is shareable. Additionally, `Arc<T>` is itself
    //! sendable while `Rc<T>` is not.
    //!
    //! This type allows for shared access to the contained data, and is often
    //! paired with synchronization primitives such as mutexes to allow mutation of
    //! shared resources.
    //!
    //! ## Collections
    //!
    //! Implementations of the most common general purpose data structures are
    //! defined in this library. They are reexported through the
    //! [standard collections library](../std/collections/index.html).
    //!
    //! ## Heap interfaces
    //!
    //! The [`heap`](heap/index.html) module defines the low-level interface to the
    //! default global allocator. It is not compatible with the libc allocator API.

    #![allow(unused_attributes)]
    #![unstable(feature = "alloc",
                reason = "this library is unlikely to be stabilized in its current \
                          form or name",
                issue = "27783")]
    #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
           html_favicon_url = "../../rust-logo-32x32-blk.png",
           html_root_url = "https://doc.rust-lang.org/nightly/",
           issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/",
           test(no_crate_inject, attr(allow(unused_variables), deny(warnings))))]
    #![no_std]
    #![needs_allocator]
    #![deny(warnings)]
    #![deny(missing_debug_implementations)]

    #![cfg_attr(test, allow(deprecated))] // rand
    #![cfg_attr(test, feature(placement_in))]
    #![cfg_attr(not(test), feature(core_float))]
    #![cfg_attr(not(test), feature(exact_size_is_empty))]
    #![cfg_attr(not(test), feature(slice_rotate))]
    #![cfg_attr(not(test), feature(generator_trait))]
    #![cfg_attr(test, feature(rand, test))]
    #![feature(allow_internal_unstable)]
    #![feature(box_patterns)]
    #![feature(box_syntax)]
    #![feature(cfg_target_has_atomic)]
    #![feature(coerce_unsized)]
    #![feature(const_fn)]
    #![feature(core_intrinsics)]
    #![feature(custom_attribute)]
    #![feature(dropck_eyepatch)]
    #![feature(exact_size_is_empty)]
    #![feature(fmt_internals)]
    #![feature(fundamental)]
    #![feature(fused)]
    #![feature(generic_param_attrs)]
    #![feature(i128_type)]
    #![feature(inclusive_range)]
    #![feature(iter_rfold)]
    #![feature(lang_items)]
    #![feature(needs_allocator)]
    #![feature(nonzero)]
    #![feature(offset_to)]
    #![feature(optin_builtin_traits)]
    #![feature(pattern)]
    #![feature(placement_in_syntax)]
    #![feature(placement_new_protocol)]
    #![feature(rustc_attrs)]
    #![feature(shared)]
    #![feature(slice_get_slice)]
    #![feature(slice_patterns)]
    #![feature(slice_rsplit)]
    #![feature(specialization)]
    #![feature(staged_api)]
    #![feature(str_internals)]
    #![feature(trusted_len)]
    #![feature(unboxed_closures)]
    #![feature(unicode)]
    #![feature(unique)]
    #![feature(unsize)]
    #![feature(allocator_internals)]

    #![cfg_attr(not(test), feature(fused, fn_traits, placement_new_protocol, swap_with_slice, i128))]
    #![cfg_attr(test, feature(test, box_heap))]

    // Allow testing this library

    #[cfg(test)]
    #[macro_use]
    extern crate std;
    #[cfg(test)]
    extern crate test;

    extern crate std_unicode;

    // Module with internal macros used by other modules (needs to be included before other modules).
    #[macro_use]
    mod macros;

    // Allocator trait and helper struct definitions

    pub mod allocator;

    // Heaps provided for low-level allocation strategies

    pub mod heap;

    // Primitive types using the heaps above

    // Need to conditionally define the mod from `boxed.rs` to avoid
    // duplicating the lang-items when building in test cfg; but also need
    // to allow code to have `use boxed::HEAP;`
    // and `use boxed::Box;` declarations.
    #[cfg(not(test))]
    pub mod boxed;
    #[cfg(test)]
    mod boxed {
        pub use std::boxed::{Box, IntermediateBox, HEAP};
    }
    #[cfg(test)]
    mod boxed_test;
    #[cfg(target_has_atomic = "ptr")]
    pub mod arc;
    pub mod rc;
    pub mod raw_vec;

    // collections modules
    pub mod binary_heap;
    mod btree;
    pub mod borrow;
    pub mod fmt;
    pub mod linked_list;
    pub mod range;
    pub mod slice;
    pub mod str;
    pub mod string;
    pub mod vec;
    pub mod vec_deque;

    #[stable(feature = "rust1", since = "1.0.0")]
    pub mod btree_map {
        //! A map based on a B-Tree.
        #[stable(feature = "rust1", since = "1.0.0")]
        pub use btree::map::*;
    }

    #[stable(feature = "rust1", since = "1.0.0")]
    pub mod btree_set {
        //! A set based on a B-Tree.
        #[stable(feature = "rust1", since = "1.0.0")]
        pub use btree::set::*;
    }

    #[cfg(not(test))]
    mod std {
        pub use core::ops;      // RangeFull
    }

    /// An endpoint of a range of keys.
    ///
    /// # Examples
    ///
    /// `Bound`s are range endpoints:
    ///
    /// ```
    /// #![feature(collections_range)]
    ///
    /// use std::collections::range::RangeArgument;
    /// use std::collections::Bound::*;
    ///
    /// assert_eq!((..100).start(), Unbounded);
    /// assert_eq!((1..12).start(), Included(&1));
    /// assert_eq!((1..12).end(), Excluded(&12));
    /// ```
    ///
    /// Using a tuple of `Bound`s as an argument to [`BTreeMap::range`].
    /// Note that in most cases, it's better to use range syntax (`1..5`) instead.
    ///
    /// ```
    /// use std::collections::BTreeMap;
    /// use std::collections::Bound::{Excluded, Included, Unbounded};
    ///
    /// let mut map = BTreeMap::new();
    /// map.insert(3, "a");
    /// map.insert(5, "b");
    /// map.insert(8, "c");
    ///
    /// for (key, value) in map.range((Excluded(3), Included(8))) {
    ///     println!("{}: {}", key, value);
    /// }
    ///
    /// assert_eq!(Some((&3, &"a")), map.range((Unbounded, Included(5))).next());
    /// ```
    ///
    /// [`BTreeMap::range`]: btree_map/struct.BTreeMap.html#method.range
    #[stable(feature = "collections_bound", since = "1.17.0")]
    #[derive(Clone, Copy, Debug, Hash, PartialEq, Eq)]
    pub enum Bound<T> {
        /// An inclusive bound.
        #[stable(feature = "collections_bound", since = "1.17.0")]
        Included(#[stable(feature = "collections_bound", since = "1.17.0")] T),
        /// An exclusive bound.
        #[stable(feature = "collections_bound", since = "1.17.0")]
        Excluded(#[stable(feature = "collections_bound", since = "1.17.0")] T),
        /// An infinite endpoint. Indicates that there is no bound in this direction.
        #[stable(feature = "collections_bound", since = "1.17.0")]
        Unbounded,
    }

    /// An intermediate trait for specialization of `Extend`.
    #[doc(hidden)]
    trait SpecExtend<I: IntoIterator> {
        /// Extends `self` with the contents of the given iterator.
        fn spec_extend(&mut self, iter: I);
    }

    #[doc(no_inline)]
    pub use binary_heap::BinaryHeap;
    #[doc(no_inline)]
    pub use btree_map::BTreeMap;
    #[doc(no_inline)]
    pub use btree_set::BTreeSet;
    #[doc(no_inline)]
    pub use linked_list::LinkedList;
    #[doc(no_inline)]
    pub use vec_deque::VecDeque;
    #[doc(no_inline)]
    pub use string::String;
    #[doc(no_inline)]
    pub use vec::Vec;

# Help

## Keyboard Shortcuts

?
  Show this help dialog
S
  Focus the search field
⇤
  Move up in search results
⇥
  Move down in search results
⏎
  Go to active search result
+
  Collapse/expand all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g. `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g. `vec -> usize` or `* -> vec`)