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Document that there are many possible null pointers

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This commit is contained in:
Josh Stone 2017-09-29 13:59:53 -07:00
parent 8b2e09ffbb
commit 5c6118339a
1 changed files with 10 additions and 0 deletions
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10
src/libcore/ptr.rs
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@ -476,6 +476,11 @@ pub unsafe fn write_volatile<T>(dst: *mut T, src: T) {
impl<T: ?Sized> *const T {
/// Returns `true` if the pointer is null.
///
/// Note that unsized types have many possible null pointers, as only the
/// raw data pointer is considered, not their length, vtable, etc.
/// Therefore, two pointers that are null may still not compare equal to
/// each other.
///
/// # Examples
///
/// Basic usage:
@ -1109,6 +1114,11 @@ impl<T: ?Sized> *const T {
impl<T: ?Sized> *mut T {
/// Returns `true` if the pointer is null.
///
/// Note that unsized types have many possible null pointers, as only the
/// raw data pointer is considered, not their length, vtable, etc.
/// Therefore, two pointers that are null may still not compare equal to
/// each other.
///
/// # Examples
///
/// Basic usage: