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Fix document examples of Vec::from_raw_parts and Vec::from_raw_parts_in

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Signed-off-by: Li Zhanhui <lizhanhui@gmail.com>
This commit is contained in:
Li Zhanhui 2023-06-29 04:21:00 +00:00
parent 75726cae37
commit 9a67df290c
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1 changed files with 15 additions and 14 deletions
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29
library/alloc/src/vec/mod.rs
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@ -560,22 +560,20 @@ impl<T> Vec<T> {
/// Using memory that was allocated elsewhere:
///
/// ```rust
/// #![feature(allocator_api)]
///
/// use std::alloc::{AllocError, Allocator, Global, Layout};
/// use std::alloc::{alloc, Layout};
///
/// fn main() {
/// let layout = Layout::array::<u32>(16).expect("overflow cannot happen");
///
/// let vec = unsafe {
/// let mem = match Global.allocate(layout) {
/// Ok(mem) => mem.cast::<u32>().as_ptr(),
/// Err(AllocError) => return,
/// };
/// let mem = alloc(layout).cast::<u32>();
/// if mem.is_null() {
/// return;
/// }
///
/// mem.write(1_000_000);
///
/// Vec::from_raw_parts_in(mem, 1, 16, Global)
/// Vec::from_raw_parts(mem, 1, 16)
/// };
///
/// assert_eq!(vec, &[1_000_000]);
@ -758,19 +756,22 @@ impl<T, A: Allocator> Vec<T, A> {
/// Using memory that was allocated elsewhere:
///
/// ```rust
/// use std::alloc::{alloc, Layout};
/// #![feature(allocator_api)]
///
/// use std::alloc::{AllocError, Allocator, Global, Layout};
///
/// fn main() {
/// let layout = Layout::array::<u32>(16).expect("overflow cannot happen");
///
/// let vec = unsafe {
/// let mem = alloc(layout).cast::<u32>();
/// if mem.is_null() {
/// return;
/// }
/// let mem = match Global.allocate(layout) {
/// Ok(mem) => mem.cast::<u32>().as_ptr(),
/// Err(AllocError) => return,
/// };
///
/// mem.write(1_000_000);
///
/// Vec::from_raw_parts(mem, 1, 16)
/// Vec::from_raw_parts_in(mem, 1, 16, Global)
/// };
///
/// assert_eq!(vec, &[1_000_000]);