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Document that Vec::from_raw_parts[_in] must be given a pointer from the correct allocator. #106584

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Jan 9, 2023
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Document that Vec::from_raw_parts[_in] must be given a pointer from the correct allocator. #106584

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5 changes: 5 additions & 0 deletions library/alloc/src/vec/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -490,6 +490,8 @@ impl<T> Vec<T> {
/// This is highly unsafe, due to the number of invariants that aren't
/// checked:
///
/// * `ptr` must have been allocated using the global allocator, such as via
/// the [`alloc::alloc`] function.
/// * `T` needs to have the same alignment as what `ptr` was allocated with.
/// (`T` having a less strict alignment is not sufficient, the alignment really
/// needs to be equal to satisfy the [`dealloc`] requirement that memory must be
Expand Down Expand Up @@ -526,6 +528,7 @@ impl<T> Vec<T> {
/// function.
///
/// [`String`]: crate::string::String
/// [`alloc::alloc`]: crate::alloc::alloc
/// [`dealloc`]: crate::alloc::GlobalAlloc::dealloc
///
/// # Examples
Expand Down Expand Up @@ -681,6 +684,7 @@ impl<T, A: Allocator> Vec<T, A> {
/// This is highly unsafe, due to the number of invariants that aren't
/// checked:
///
/// * `ptr` must be [*currently allocated*] via the given allocator `alloc`.
/// * `T` needs to have the same alignment as what `ptr` was allocated with.
/// (`T` having a less strict alignment is not sufficient, the alignment really
/// needs to be equal to satisfy the [`dealloc`] requirement that memory must be
Expand Down Expand Up @@ -714,6 +718,7 @@ impl<T, A: Allocator> Vec<T, A> {
///
/// [`String`]: crate::string::String
/// [`dealloc`]: crate::alloc::GlobalAlloc::dealloc
/// [*currently allocated*]: crate::alloc::Allocator#currently-allocated-memory
/// [*fit*]: crate::alloc::Allocator#memory-fitting
///
/// # Examples
Expand Down