120 lines
3.1 KiB
Rust
120 lines
3.1 KiB
Rust
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// SPDX-License-Identifier: Apache-2.0 OR MIT
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use crate::alloc::Allocator;
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use crate::collections::TryReserveError;
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use core::iter::TrustedLen;
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use core::slice::{self};
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use super::{IntoIter, Vec};
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// Specialization trait used for Vec::extend
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#[cfg(not(no_global_oom_handling))]
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pub(super) trait SpecExtend<T, I> {
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fn spec_extend(&mut self, iter: I);
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}
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// Specialization trait used for Vec::try_extend
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pub(super) trait TrySpecExtend<T, I> {
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fn try_spec_extend(&mut self, iter: I) -> Result<(), TryReserveError>;
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}
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#[cfg(not(no_global_oom_handling))]
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impl<T, I, A: Allocator> SpecExtend<T, I> for Vec<T, A>
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where
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I: Iterator<Item = T>,
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{
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default fn spec_extend(&mut self, iter: I) {
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self.extend_desugared(iter)
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}
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}
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impl<T, I, A: Allocator> TrySpecExtend<T, I> for Vec<T, A>
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where
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I: Iterator<Item = T>,
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{
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default fn try_spec_extend(&mut self, iter: I) -> Result<(), TryReserveError> {
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self.try_extend_desugared(iter)
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}
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}
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#[cfg(not(no_global_oom_handling))]
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impl<T, I, A: Allocator> SpecExtend<T, I> for Vec<T, A>
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where
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I: TrustedLen<Item = T>,
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{
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default fn spec_extend(&mut self, iterator: I) {
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self.extend_trusted(iterator)
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}
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}
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impl<T, I, A: Allocator> TrySpecExtend<T, I> for Vec<T, A>
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where
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I: TrustedLen<Item = T>,
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{
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default fn try_spec_extend(&mut self, iterator: I) -> Result<(), TryReserveError> {
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self.try_extend_trusted(iterator)
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}
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}
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#[cfg(not(no_global_oom_handling))]
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impl<T, A: Allocator> SpecExtend<T, IntoIter<T>> for Vec<T, A> {
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fn spec_extend(&mut self, mut iterator: IntoIter<T>) {
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unsafe {
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self.append_elements(iterator.as_slice() as _);
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}
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iterator.forget_remaining_elements();
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}
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}
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impl<T, A: Allocator> TrySpecExtend<T, IntoIter<T>> for Vec<T, A> {
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fn try_spec_extend(&mut self, mut iterator: IntoIter<T>) -> Result<(), TryReserveError> {
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unsafe {
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self.try_append_elements(iterator.as_slice() as _)?;
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}
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iterator.forget_remaining_elements();
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Ok(())
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}
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}
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#[cfg(not(no_global_oom_handling))]
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impl<'a, T: 'a, I, A: Allocator + 'a> SpecExtend<&'a T, I> for Vec<T, A>
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where
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I: Iterator<Item = &'a T>,
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T: Clone,
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{
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default fn spec_extend(&mut self, iterator: I) {
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self.spec_extend(iterator.cloned())
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}
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}
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impl<'a, T: 'a, I, A: Allocator + 'a> TrySpecExtend<&'a T, I> for Vec<T, A>
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where
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I: Iterator<Item = &'a T>,
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T: Clone,
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{
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default fn try_spec_extend(&mut self, iterator: I) -> Result<(), TryReserveError> {
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self.try_spec_extend(iterator.cloned())
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}
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}
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#[cfg(not(no_global_oom_handling))]
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impl<'a, T: 'a, A: Allocator + 'a> SpecExtend<&'a T, slice::Iter<'a, T>> for Vec<T, A>
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where
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T: Copy,
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{
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fn spec_extend(&mut self, iterator: slice::Iter<'a, T>) {
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let slice = iterator.as_slice();
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unsafe { self.append_elements(slice) };
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}
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}
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impl<'a, T: 'a, A: Allocator + 'a> TrySpecExtend<&'a T, slice::Iter<'a, T>> for Vec<T, A>
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where
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T: Copy,
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{
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fn try_spec_extend(&mut self, iterator: slice::Iter<'a, T>) -> Result<(), TryReserveError> {
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let slice = iterator.as_slice();
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unsafe { self.try_append_elements(slice) }
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}
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}
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