#![stable(feature = "rust1", since = "1.0.0")]
+use clone;
+use cmp;
+use fmt;
+use hash;
use intrinsics;
+use marker::{Copy, PhantomData, Sized};
use ptr;
#[stable(feature = "rust1", since = "1.0.0")]
pub unsafe fn transmute_copy<T, U>(src: &T) -> U {
ptr::read(src as *const T as *const U)
}
+
+/// Opaque type representing the discriminant of an enum.
+///
+/// See the `discriminant` function in this module for more information.
+#[unstable(feature = "discriminant_value", reason = "recently added, follows RFC", issue = "24263")]
+pub struct Discriminant<T>(u64, PhantomData<*const T>);
+
+// N.B. These trait implementations cannot be derived because we don't want any bounds on T.
+
+#[unstable(feature = "discriminant_value", reason = "recently added, follows RFC", issue = "24263")]
+impl<T> Copy for Discriminant<T> {}
+
+#[unstable(feature = "discriminant_value", reason = "recently added, follows RFC", issue = "24263")]
+impl<T> clone::Clone for Discriminant<T> {
+ fn clone(&self) -> Self {
+ *self
+ }
+}
+
+#[unstable(feature = "discriminant_value", reason = "recently added, follows RFC", issue = "24263")]
+impl<T> cmp::PartialEq for Discriminant<T> {
+ fn eq(&self, rhs: &Self) -> bool {
+ self.0 == rhs.0
+ }
+}
+
+#[unstable(feature = "discriminant_value", reason = "recently added, follows RFC", issue = "24263")]
+impl<T> cmp::Eq for Discriminant<T> {}
+
+#[unstable(feature = "discriminant_value", reason = "recently added, follows RFC", issue = "24263")]
+impl<T> hash::Hash for Discriminant<T> {
+ fn hash<H: hash::Hasher>(&self, state: &mut H) {
+ self.0.hash(state);
+ }
+}
+
+#[unstable(feature = "discriminant_value", reason = "recently added, follows RFC", issue = "24263")]
+impl<T> fmt::Debug for Discriminant<T> {
+ fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+ fmt.debug_tuple("Discriminant")
+ .field(&self.0)
+ .finish()
+ }
+}
+
+/// Returns a value uniquely identifying the enum variant in `v`.
+///
+/// If `T` is not an enum, calling this function will not result in undefined behavior, but the
+/// return value is unspecified.
+///
+/// # Stability
+///
+/// The discriminant of an enum variant may change if the enum definition changes. A discriminant
+/// of some variant will not change between compilations with the same compiler.
+///
+/// # Examples
+///
+/// This can be used to compare enums that carry data, while disregarding
+/// the actual data:
+///
+/// ```
+/// #![feature(discriminant_value)]
+/// use std::mem;
+///
+/// enum Foo { A(&'static str), B(i32), C(i32) }
+///
+/// assert!(mem::discriminant(&Foo::A("bar")) == mem::discriminant(&Foo::A("baz")));
+/// assert!(mem::discriminant(&Foo::B(1)) == mem::discriminant(&Foo::B(2)));
+/// assert!(mem::discriminant(&Foo::B(3)) != mem::discriminant(&Foo::C(3)));
+/// ```
+#[unstable(feature = "discriminant_value", reason = "recently added, follows RFC", issue = "24263")]
+pub fn discriminant<T>(v: &T) -> Discriminant<T> {
+ unsafe {
+ Discriminant(intrinsics::discriminant_value(v), PhantomData)
+ }
+}
+
--- /dev/null
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![feature(discriminant_value)]
+
+use std::mem;
+
+enum ADT {
+ First(u32, u32),
+ Second(u64)
+}
+
+pub fn main() {
+ assert!(mem::discriminant(&ADT::First(0,0)) == mem::discriminant(&ADT::First(1,1)));
+ assert!(mem::discriminant(&ADT::Second(5)) == mem::discriminant(&ADT::Second(6)));
+ assert!(mem::discriminant(&ADT::First(2,2)) != mem::discriminant(&ADT::Second(2)));
+
+ let _ = mem::discriminant(&10);
+ let _ = mem::discriminant(&"test");
+}
+