24 lines
619 B
Rust
24 lines
619 B
Rust
use core::ptr::{self};
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use core::slice::{self};
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// A helper struct for in-place iteration that drops the destination slice of iteration,
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// i.e. the head. The source slice (the tail) is dropped by IntoIter.
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pub(super) struct InPlaceDrop<T> {
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pub(super) inner: *mut T,
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pub(super) dst: *mut T,
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}
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impl<T> InPlaceDrop<T> {
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fn len(&self) -> usize {
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unsafe { self.dst.offset_from(self.inner) as usize }
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}
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}
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impl<T> Drop for InPlaceDrop<T> {
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#[inline]
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fn drop(&mut self) {
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unsafe {
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ptr::drop_in_place(slice::from_raw_parts_mut(self.inner, self.len()));
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}
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}
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}
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