157 строки
4.3 KiB
Rust
157 строки
4.3 KiB
Rust
// SPDX-License-Identifier: Apache-2.0 OR MIT
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//! Collection types.
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#![stable(feature = "rust1", since = "1.0.0")]
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#[cfg(not(no_global_oom_handling))]
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pub mod binary_heap;
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#[cfg(not(no_global_oom_handling))]
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mod btree;
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#[cfg(not(no_global_oom_handling))]
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pub mod linked_list;
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#[cfg(not(no_global_oom_handling))]
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pub mod vec_deque;
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#[cfg(not(no_global_oom_handling))]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub mod btree_map {
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//! An ordered map based on a B-Tree.
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#[stable(feature = "rust1", since = "1.0.0")]
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pub use super::btree::map::*;
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}
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#[cfg(not(no_global_oom_handling))]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub mod btree_set {
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//! An ordered set based on a B-Tree.
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#[stable(feature = "rust1", since = "1.0.0")]
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pub use super::btree::set::*;
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}
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#[cfg(not(no_global_oom_handling))]
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#[stable(feature = "rust1", since = "1.0.0")]
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#[doc(no_inline)]
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pub use binary_heap::BinaryHeap;
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#[cfg(not(no_global_oom_handling))]
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#[stable(feature = "rust1", since = "1.0.0")]
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#[doc(no_inline)]
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pub use btree_map::BTreeMap;
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#[cfg(not(no_global_oom_handling))]
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#[stable(feature = "rust1", since = "1.0.0")]
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#[doc(no_inline)]
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pub use btree_set::BTreeSet;
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#[cfg(not(no_global_oom_handling))]
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#[stable(feature = "rust1", since = "1.0.0")]
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#[doc(no_inline)]
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pub use linked_list::LinkedList;
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#[cfg(not(no_global_oom_handling))]
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#[stable(feature = "rust1", since = "1.0.0")]
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#[doc(no_inline)]
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pub use vec_deque::VecDeque;
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use crate::alloc::{Layout, LayoutError};
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use core::fmt::Display;
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/// The error type for `try_reserve` methods.
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#[derive(Clone, PartialEq, Eq, Debug)]
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#[stable(feature = "try_reserve", since = "1.57.0")]
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pub struct TryReserveError {
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kind: TryReserveErrorKind,
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}
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impl TryReserveError {
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/// Details about the allocation that caused the error
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#[inline]
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#[must_use]
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#[unstable(
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feature = "try_reserve_kind",
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reason = "Uncertain how much info should be exposed",
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issue = "48043"
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)]
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pub fn kind(&self) -> TryReserveErrorKind {
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self.kind.clone()
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}
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}
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/// Details of the allocation that caused a `TryReserveError`
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#[derive(Clone, PartialEq, Eq, Debug)]
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#[unstable(
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feature = "try_reserve_kind",
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reason = "Uncertain how much info should be exposed",
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issue = "48043"
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)]
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pub enum TryReserveErrorKind {
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/// Error due to the computed capacity exceeding the collection's maximum
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/// (usually `isize::MAX` bytes).
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CapacityOverflow,
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/// The memory allocator returned an error
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AllocError {
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/// The layout of allocation request that failed
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layout: Layout,
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#[doc(hidden)]
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#[unstable(
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feature = "container_error_extra",
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issue = "none",
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reason = "\
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Enable exposing the allocator’s custom error value \
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if an associated type is added in the future: \
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https://github.com/rust-lang/wg-allocators/issues/23"
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)]
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non_exhaustive: (),
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},
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}
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#[unstable(
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feature = "try_reserve_kind",
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reason = "Uncertain how much info should be exposed",
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issue = "48043"
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)]
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impl From<TryReserveErrorKind> for TryReserveError {
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#[inline]
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fn from(kind: TryReserveErrorKind) -> Self {
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Self { kind }
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}
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}
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#[unstable(feature = "try_reserve_kind", reason = "new API", issue = "48043")]
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impl From<LayoutError> for TryReserveErrorKind {
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/// Always evaluates to [`TryReserveErrorKind::CapacityOverflow`].
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#[inline]
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fn from(_: LayoutError) -> Self {
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TryReserveErrorKind::CapacityOverflow
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}
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}
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#[stable(feature = "try_reserve", since = "1.57.0")]
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impl Display for TryReserveError {
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fn fmt(
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&self,
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fmt: &mut core::fmt::Formatter<'_>,
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) -> core::result::Result<(), core::fmt::Error> {
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fmt.write_str("memory allocation failed")?;
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let reason = match self.kind {
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TryReserveErrorKind::CapacityOverflow => {
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" because the computed capacity exceeded the collection's maximum"
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}
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TryReserveErrorKind::AllocError { .. } => {
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" because the memory allocator returned a error"
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}
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};
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fmt.write_str(reason)
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}
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}
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/// An intermediate trait for specialization of `Extend`.
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#[doc(hidden)]
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trait SpecExtend<I: IntoIterator> {
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/// Extends `self` with the contents of the given iterator.
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fn spec_extend(&mut self, iter: I);
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}
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