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