1//! Collection types.
2
3// Note: This module is also included in the alloctests crate using #[path] to
4// run the tests. See the comment there for an explanation why this is the case.
5
6#![stable(feature = "rust1", since = "1.0.0")]
7
8#[cfg(not(no_global_oom_handling))]
9pub mod binary_heap;
10#[cfg(not(no_global_oom_handling))]
11mod btree;
12#[cfg(not(no_global_oom_handling))]
13pub mod linked_list;
14#[cfg(not(no_global_oom_handling))]
15pub mod vec_deque;
16
17#[cfg(not(no_global_oom_handling))]
18#[stable(feature = "rust1", since = "1.0.0")]
19pub mod btree_map {
20 //! An ordered map based on a B-Tree.
21 #[stable(feature = "rust1", since = "1.0.0")]
22 pub use super::btree::map::*;
23}
24
25#[cfg(not(no_global_oom_handling))]
26#[stable(feature = "rust1", since = "1.0.0")]
27pub mod btree_set {
28 //! An ordered set based on a B-Tree.
29 #[stable(feature = "rust1", since = "1.0.0")]
30 #[cfg(not(test))]
31 pub use super::btree::set::*;
32}
33
34#[cfg(not(test))]
35use core::fmt::Display;
36
37#[cfg(not(no_global_oom_handling))]
38#[stable(feature = "rust1", since = "1.0.0")]
39#[doc(no_inline)]
40#[cfg(not(test))]
41pub use binary_heap::BinaryHeap;
42#[cfg(not(no_global_oom_handling))]
43#[stable(feature = "rust1", since = "1.0.0")]
44#[doc(no_inline)]
45#[cfg(not(test))]
46pub use btree_map::BTreeMap;
47#[cfg(not(no_global_oom_handling))]
48#[stable(feature = "rust1", since = "1.0.0")]
49#[doc(no_inline)]
50#[cfg(not(test))]
51pub use btree_set::BTreeSet;
52#[cfg(not(no_global_oom_handling))]
53#[stable(feature = "rust1", since = "1.0.0")]
54#[doc(no_inline)]
55#[cfg(not(test))]
56pub use linked_list::LinkedList;
57#[cfg(not(no_global_oom_handling))]
58#[stable(feature = "rust1", since = "1.0.0")]
59#[doc(no_inline)]
60#[cfg(not(test))]
61pub use vec_deque::VecDeque;
62
63#[cfg(not(test))]
64use crate::alloc::{Layout, LayoutError};
65
66/// The error type for `try_reserve` methods.
67#[derive(Clone, PartialEq, Eq, Debug)]
68#[stable(feature = "try_reserve", since = "1.57.0")]
69#[cfg(not(test))]
70pub struct TryReserveError {
71 kind: TryReserveErrorKind,
72}
73
74#[cfg(test)]
75pub use realalloc::collections::TryReserveError;
76
77#[cfg(not(test))]
78impl TryReserveError {
79 /// Details about the allocation that caused the error
80 #[inline]
81 #[must_use]
82 #[unstable(
83 feature = "try_reserve_kind",
84 reason = "Uncertain how much info should be exposed",
85 issue = "48043"
86 )]
87 pub fn kind(&self) -> TryReserveErrorKind {
88 self.kind.clone()
89 }
90}
91
92/// Details of the allocation that caused a `TryReserveError`
93#[derive(Clone, PartialEq, Eq, Debug)]
94#[unstable(
95 feature = "try_reserve_kind",
96 reason = "Uncertain how much info should be exposed",
97 issue = "48043"
98)]
99#[cfg(not(test))]
100pub enum TryReserveErrorKind {
101 /// Error due to the computed capacity exceeding the collection's maximum
102 /// (usually `isize::MAX` bytes).
103 CapacityOverflow,
104
105 /// The memory allocator returned an error
106 AllocError {
107 /// The layout of allocation request that failed
108 layout: Layout,
109
110 #[doc(hidden)]
111 #[unstable(
112 feature = "container_error_extra",
113 issue = "none",
114 reason = "\
115 Enable exposing the allocator’s custom error value \
116 if an associated type is added in the future: \
117 https://github.com/rust-lang/wg-allocators/issues/23"
118 )]
119 non_exhaustive: (),
120 },
121}
122
123#[cfg(test)]
124pub use realalloc::collections::TryReserveErrorKind;
125
126#[unstable(
127 feature = "try_reserve_kind",
128 reason = "Uncertain how much info should be exposed",
129 issue = "48043"
130)]
131#[cfg(not(test))]
132impl From<TryReserveErrorKind> for TryReserveError {
133 #[inline]
134 fn from(kind: TryReserveErrorKind) -> Self {
135 Self { kind }
136 }
137}
138
139#[unstable(feature = "try_reserve_kind", reason = "new API", issue = "48043")]
140#[cfg(not(test))]
141impl From<LayoutError> for TryReserveErrorKind {
142 /// Always evaluates to [`TryReserveErrorKind::CapacityOverflow`].
143 #[inline]
144 fn from(_: LayoutError) -> Self {
145 TryReserveErrorKind::CapacityOverflow
146 }
147}
148
149#[stable(feature = "try_reserve", since = "1.57.0")]
150#[cfg(not(test))]
151impl Display for TryReserveError {
152 fn fmt(
153 &self,
154 fmt: &mut core::fmt::Formatter<'_>,
155 ) -> core::result::Result<(), core::fmt::Error> {
156 fmt.write_str(data:"memory allocation failed")?;
157 let reason: &'static str = match self.kind {
158 TryReserveErrorKind::CapacityOverflow => {
159 " because the computed capacity exceeded the collection's maximum"
160 }
161 TryReserveErrorKind::AllocError { .. } => {
162 " because the memory allocator returned an error"
163 }
164 };
165 fmt.write_str(data:reason)
166 }
167}
168
169/// An intermediate trait for specialization of `Extend`.
170#[doc(hidden)]
171#[cfg(not(no_global_oom_handling))]
172trait SpecExtend<I: IntoIterator> {
173 /// Extends `self` with the contents of the given iterator.
174 fn spec_extend(&mut self, iter: I);
175}
176
177#[stable(feature = "try_reserve", since = "1.57.0")]
178#[cfg(not(test))]
179impl core::error::Error for TryReserveError {}
180

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