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std: Deprecate the copy_{,mut_}lifetime functions

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Unsafe patterns such as `slice::from_raw_parts` and `CStr::from_ptr` have shown
that dealing with lifetimes, while useful, is often a hindrance. Consequently
these functions are rarely called today and are being deprecated.
This commit is contained in:
Alex Crichton 2015-06-10 18:03:13 -07:00
parent 669d1cd9e2
commit 153de4c5d9
1 changed files with 8 additions and 0 deletions
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8
src/libcore/mem.rs
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@ -462,6 +462,10 @@ pub unsafe fn transmute_copy<T, U>(src: &T) -> U {
#[unstable(feature = "copy_lifetime",
reason = "this function may be removed in the future due to its \
questionable utility")]
#[deprecated(since = "1.2.0",
reason = "unclear that this function buys more safety and \
lifetimes are generally not handled as such in unsafe \
code today")]
pub unsafe fn copy_lifetime<'a, S: ?Sized, T: ?Sized + 'a>(_ptr: &'a S,
ptr: &T) -> &'a T {
transmute(ptr)
@ -472,6 +476,10 @@ pub unsafe fn copy_lifetime<'a, S: ?Sized, T: ?Sized + 'a>(_ptr: &'a S,
#[unstable(feature = "copy_lifetime",
reason = "this function may be removed in the future due to its \
questionable utility")]
#[deprecated(since = "1.2.0",
reason = "unclear that this function buys more safety and \
lifetimes are generally not handled as such in unsafe \
code today")]
pub unsafe fn copy_mut_lifetime<'a, S: ?Sized, T: ?Sized + 'a>(_ptr: &'a S,
ptr: &mut T)
-> &'a mut T