87 lines
2.0 KiB
Rust
87 lines
2.0 KiB
Rust
// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Borrowed pointer utilities
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#[cfg(not(test))]
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use prelude::*;
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/// Cast a region pointer - &T - to a uint.
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#[inline]
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pub fn to_uint<T>(thing: &T) -> uint {
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thing as *T as uint
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}
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/// Determine if two borrowed pointers point to the same thing.
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#[inline]
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pub fn ref_eq<'a, 'b, T>(thing: &'a T, other: &'b T) -> bool {
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(thing as *T) == (other as *T)
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}
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// Equality for region pointers
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#[cfg(not(test))]
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impl<'a, T: Eq> Eq for &'a T {
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#[inline]
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fn eq(&self, other: & &'a T) -> bool {
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*(*self) == *(*other)
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}
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#[inline]
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fn ne(&self, other: & &'a T) -> bool {
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*(*self) != *(*other)
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}
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}
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// Comparison for region pointers
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#[cfg(not(test))]
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impl<'a, T: Ord> Ord for &'a T {
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#[inline]
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fn lt(&self, other: & &'a T) -> bool {
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*(*self) < *(*other)
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}
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#[inline]
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fn le(&self, other: & &'a T) -> bool {
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*(*self) <= *(*other)
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}
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#[inline]
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fn ge(&self, other: & &'a T) -> bool {
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*(*self) >= *(*other)
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}
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#[inline]
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fn gt(&self, other: & &'a T) -> bool {
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*(*self) > *(*other)
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}
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}
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#[cfg(not(test))]
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impl<'a, T: TotalOrd> TotalOrd for &'a T {
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#[inline]
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fn cmp(&self, other: & &'a T) -> Ordering { (**self).cmp(*other) }
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}
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#[cfg(not(test))]
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impl<'a, T: TotalEq> TotalEq for &'a T {
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#[inline]
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fn equals(&self, other: & &'a T) -> bool { (**self).equals(*other) }
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}
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#[cfg(test)]
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mod tests {
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use super::ref_eq;
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#[test]
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fn test_ref_eq() {
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let x = 1;
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let y = 1;
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assert!(ref_eq(&x, &x));
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assert!(!ref_eq(&x, &y));
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}
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}
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