1 // SPDX-License-Identifier: Apache-2.0 OR MIT
3 use crate::alloc::Allocator;
4 use crate::collections::TryReserveError;
5 use core::iter::TrustedLen;
6 use core::slice::{self};
8 use super::{IntoIter, Vec};
10 // Specialization trait used for Vec::extend
11 #[cfg(not(no_global_oom_handling))]
12 pub(super) trait SpecExtend<T, I> {
13 fn spec_extend(&mut self, iter: I);
16 // Specialization trait used for Vec::try_extend
17 pub(super) trait TrySpecExtend<T, I> {
18 fn try_spec_extend(&mut self, iter: I) -> Result<(), TryReserveError>;
21 #[cfg(not(no_global_oom_handling))]
22 impl<T, I, A: Allocator> SpecExtend<T, I> for Vec<T, A>
24 I: Iterator<Item = T>,
26 default fn spec_extend(&mut self, iter: I) {
27 self.extend_desugared(iter)
31 impl<T, I, A: Allocator> TrySpecExtend<T, I> for Vec<T, A>
33 I: Iterator<Item = T>,
35 default fn try_spec_extend(&mut self, iter: I) -> Result<(), TryReserveError> {
36 self.try_extend_desugared(iter)
40 #[cfg(not(no_global_oom_handling))]
41 impl<T, I, A: Allocator> SpecExtend<T, I> for Vec<T, A>
43 I: TrustedLen<Item = T>,
45 default fn spec_extend(&mut self, iterator: I) {
46 self.extend_trusted(iterator)
50 impl<T, I, A: Allocator> TrySpecExtend<T, I> for Vec<T, A>
52 I: TrustedLen<Item = T>,
54 default fn try_spec_extend(&mut self, iterator: I) -> Result<(), TryReserveError> {
55 self.try_extend_trusted(iterator)
59 #[cfg(not(no_global_oom_handling))]
60 impl<T, A: Allocator> SpecExtend<T, IntoIter<T>> for Vec<T, A> {
61 fn spec_extend(&mut self, mut iterator: IntoIter<T>) {
63 self.append_elements(iterator.as_slice() as _);
65 iterator.forget_remaining_elements();
69 impl<T, A: Allocator> TrySpecExtend<T, IntoIter<T>> for Vec<T, A> {
70 fn try_spec_extend(&mut self, mut iterator: IntoIter<T>) -> Result<(), TryReserveError> {
72 self.try_append_elements(iterator.as_slice() as _)?;
74 iterator.forget_remaining_elements();
79 #[cfg(not(no_global_oom_handling))]
80 impl<'a, T: 'a, I, A: Allocator> SpecExtend<&'a T, I> for Vec<T, A>
82 I: Iterator<Item = &'a T>,
85 default fn spec_extend(&mut self, iterator: I) {
86 self.spec_extend(iterator.cloned())
90 impl<'a, T: 'a, I, A: Allocator> TrySpecExtend<&'a T, I> for Vec<T, A>
92 I: Iterator<Item = &'a T>,
95 default fn try_spec_extend(&mut self, iterator: I) -> Result<(), TryReserveError> {
96 self.try_spec_extend(iterator.cloned())
100 #[cfg(not(no_global_oom_handling))]
101 impl<'a, T: 'a, A: Allocator> SpecExtend<&'a T, slice::Iter<'a, T>> for Vec<T, A>
105 fn spec_extend(&mut self, iterator: slice::Iter<'a, T>) {
106 let slice = iterator.as_slice();
107 unsafe { self.append_elements(slice) };
111 impl<'a, T: 'a, A: Allocator> TrySpecExtend<&'a T, slice::Iter<'a, T>> for Vec<T, A>
115 fn try_spec_extend(&mut self, iterator: slice::Iter<'a, T>) -> Result<(), TryReserveError> {
116 let slice = iterator.as_slice();
117 unsafe { self.try_append_elements(slice) }