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| -rw-r--r-- | src/libcore/ptr.rs | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/libcore/ptr.rs b/src/libcore/ptr.rs index e9cf11424ca..6b4ee66bb02 100644 --- a/src/libcore/ptr.rs +++ b/src/libcore/ptr.rs @@ -2509,6 +2509,29 @@ pub fn eq<T: ?Sized>(a: *const T, b: *const T) -> bool { a == b } +/// Hash the raw pointer address behind a reference, rather than the value +/// it points to. +/// +/// # Examples +/// +/// ``` +/// use std::collections::hash_map::DefaultHasher; +/// use std::hash::Hasher; +/// use std::ptr; +/// +/// let five = 5; +/// let five_ref = &five; +/// +/// let mut hasher = DefaultHasher::new(); +/// ptr::hash(five_ref, hasher); +/// println!("Hash is {:x}!", hasher.finish()); +/// ``` +#[stable(feature = "rust1", since = "1.0.0")] // TODO: replace with ??? +pub fn hash<T, S: hash::Hasher>(a: &T, into: &mut S) { + use hash::Hash; + NonNull::from(a).hash(into) +} + // Impls for function pointers macro_rules! fnptr_impls_safety_abi { ($FnTy: ty, $($Arg: ident),*) => { |