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Add missing links for mem::needs_drop

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This commit is contained in:
Lzu Tao 2019-09-30 16:12:01 +00:00
parent e0436d912d
commit cdf1852a61
1 changed files with 6 additions and 4 deletions
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10
src/libcore/mem/mod.rs
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@ -368,15 +368,17 @@ pub fn align_of_val<T: ?Sized>(val: &T) -> usize {
/// make a difference in release builds (where a loop that has no side-effects
/// is easily detected and eliminated), but is often a big win for debug builds.
///
/// Note that `ptr::drop_in_place` already performs this check, so if your workload
/// can be reduced to some small number of drop_in_place calls, using this is
/// unnecessary. In particular note that you can drop_in_place a slice, and that
/// Note that [`drop_in_place`] already performs this check, so if your workload
/// can be reduced to some small number of [`drop_in_place`] calls, using this is
/// unnecessary. In particular note that you can [`drop_in_place`] a slice, and that
/// will do a single needs_drop check for all the values.
///
/// Types like Vec therefore just `drop_in_place(&mut self[..])` without using
/// needs_drop explicitly. Types like `HashMap`, on the other hand, have to drop
/// `needs_drop` explicitly. Types like [`HashMap`], on the other hand, have to drop
/// values one at a time and should use this API.
///
/// [`drop_in_place`]: ../ptr/fn.drop_in_place.html
/// [`HashMap`]: ../../std/collections/struct.HashMap.html
///
/// # Examples
///