| 1 | |
| 2 |
|
| 3 | use crate::alloc::Allocator;
|
| 4 | use crate::collections::TryReserveError;
|
| 5 | use core::iter::TrustedLen;
|
| 6 | use core::slice::{self};
|
| 7 |
|
| 8 | use super::{IntoIter, Vec};
|
| 9 |
|
| 10 | |
| 11 | #[cfg(not(no_global_oom_handling))]
|
| 12 | pub(super) trait SpecExtend<T, I> {
|
| 13 | fn spec_extend(&mut self, iter: I);
|
| 14 | }
|
| 15 |
|
| 16 | |
| 17 | pub(super) trait TrySpecExtend<T, I> {
|
| 18 | fn try_spec_extend(&mut self, iter: I) -> Result<(), TryReserveError>;
|
| 19 | }
|
| 20 |
|
| 21 | #[cfg(not(no_global_oom_handling))]
|
| 22 | impl<T, I, A: Allocator> SpecExtend<T, I> for Vec<T, A>
|
| 23 | where
|
| 24 | I: Iterator<Item = T>,
|
| 25 | {
|
| 26 | default fn spec_extend(&mut self, iter: I) {
|
| 27 | self.extend_desugared(iter)
|
| 28 | }
|
| 29 | }
|
| 30 |
|
| 31 | impl<T, I, A: Allocator> TrySpecExtend<T, I> for Vec<T, A>
|
| 32 | where
|
| 33 | I: Iterator<Item = T>,
|
| 34 | {
|
| 35 | default fn try_spec_extend(&mut self, iter: I) -> Result<(), TryReserveError> {
|
| 36 | self.try_extend_desugared(iter)
|
| 37 | }
|
| 38 | }
|
| 39 |
|
| 40 | #[cfg(not(no_global_oom_handling))]
|
| 41 | impl<T, I, A: Allocator> SpecExtend<T, I> for Vec<T, A>
|
| 42 | where
|
| 43 | I: TrustedLen<Item = T>,
|
| 44 | {
|
| 45 | default fn spec_extend(&mut self, iterator: I) {
|
| 46 | self.extend_trusted(iterator)
|
| 47 | }
|
| 48 | }
|
| 49 |
|
| 50 | impl<T, I, A: Allocator> TrySpecExtend<T, I> for Vec<T, A>
|
| 51 | where
|
| 52 | I: TrustedLen<Item = T>,
|
| 53 | {
|
| 54 | default fn try_spec_extend(&mut self, iterator: I) -> Result<(), TryReserveError> {
|
| 55 | self.try_extend_trusted(iterator)
|
| 56 | }
|
| 57 | }
|
| 58 |
|
| 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>) {
|
| 62 | unsafe {
|
| 63 | self.append_elements(iterator.as_slice() as _);
|
| 64 | }
|
| 65 | iterator.forget_remaining_elements();
|
| 66 | }
|
| 67 | }
|
| 68 |
|
| 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> {
|
| 71 | unsafe {
|
| 72 | self.try_append_elements(iterator.as_slice() as _)?;
|
| 73 | }
|
| 74 | iterator.forget_remaining_elements();
|
| 75 | Ok(())
|
| 76 | }
|
| 77 | }
|
| 78 |
|
| 79 | #[cfg(not(no_global_oom_handling))]
|
| 80 | impl<'a, T: 'a, I, A: Allocator + 'a> SpecExtend<&'a T, I> for Vec<T, A>
|
| 81 | where
|
| 82 | I: Iterator<Item = &'a T>,
|
| 83 | T: Clone,
|
| 84 | {
|
| 85 | default fn spec_extend(&mut self, iterator: I) {
|
| 86 | self.spec_extend(iterator.cloned())
|
| 87 | }
|
| 88 | }
|
| 89 |
|
| 90 | impl<'a, T: 'a, I, A: Allocator + 'a> TrySpecExtend<&'a T, I> for Vec<T, A>
|
| 91 | where
|
| 92 | I: Iterator<Item = &'a T>,
|
| 93 | T: Clone,
|
| 94 | {
|
| 95 | default fn try_spec_extend(&mut self, iterator: I) -> Result<(), TryReserveError> {
|
| 96 | self.try_spec_extend(iterator.cloned())
|
| 97 | }
|
| 98 | }
|
| 99 |
|
| 100 | #[cfg(not(no_global_oom_handling))]
|
| 101 | impl<'a, T: 'a, A: Allocator + 'a> SpecExtend<&'a T, slice::Iter<'a, T>> for Vec<T, A>
|
| 102 | where
|
| 103 | T: Copy,
|
| 104 | {
|
| 105 | fn spec_extend(&mut self, iterator: slice::Iter<'a, T>) {
|
| 106 | let slice = iterator.as_slice();
|
| 107 | unsafe { self.append_elements(slice) };
|
| 108 | }
|
| 109 | }
|
| 110 |
|
| 111 | impl<'a, T: 'a, A: Allocator + 'a> TrySpecExtend<&'a T, slice::Iter<'a, T>> for Vec<T, A>
|
| 112 | where
|
| 113 | T: Copy,
|
| 114 | {
|
| 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) }
|
| 118 | }
|
| 119 | }
|