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Add doc examples for std::alloc::{alloc,alloc_zeroed}. #53344

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Aug 15, 2018
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Add doc examples for std::alloc::{alloc,alloc_zeroed}. #53344

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31 changes: 31 additions & 0 deletions src/liballoc/alloc.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,22 @@ pub struct Global;
/// # Safety
///
/// See [`GlobalAlloc::alloc`].
///
/// # Examples
///
/// ```
/// use std::alloc::{alloc, dealloc, Layout};
///
/// unsafe {
/// let layout = Layout::new::<u16>();
/// let ptr = alloc(layout);
///
/// *(ptr as *mut u16) = 42;
/// assert_eq!(*(ptr as *mut u16), 42);
///
/// dealloc(ptr, layout);
/// }
/// ```
#[stable(feature = "global_alloc", since = "1.28.0")]
#[inline]
pub unsafe fn alloc(layout: Layout) -> *mut u8 {
Expand Down Expand Up @@ -110,6 +126,21 @@ pub unsafe fn realloc(ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8
/// # Safety
///
/// See [`GlobalAlloc::alloc_zeroed`].
///
/// # Examples
///
/// ```
/// use std::alloc::{alloc_zeroed, dealloc, Layout};
///
/// unsafe {
/// let layout = Layout::new::<u16>();
/// let ptr = alloc_zeroed(layout);
///
/// assert_eq!(*(ptr as *mut u16), 0);
///
/// dealloc(ptr, layout);
/// }
/// ```
#[stable(feature = "global_alloc", since = "1.28.0")]
#[inline]
pub unsafe fn alloc_zeroed(layout: Layout) -> *mut u8 {
Expand Down