58 lines
1.4 KiB
Rust
58 lines
1.4 KiB
Rust
use core::clone::TrivialClone;
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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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use crate::alloc::Allocator;
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// Specialization trait used for Vec::extend
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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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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> 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, A1: Allocator, A2: Allocator> SpecExtend<T, IntoIter<T, A2>> for Vec<T, A1> {
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fn spec_extend(&mut self, mut iterator: IntoIter<T, A2>) {
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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<'a, T: 'a, I, A: Allocator> 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, A: Allocator> SpecExtend<&'a T, slice::Iter<'a, T>> for Vec<T, A>
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where
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T: TrivialClone,
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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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