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data_structures: Add a reference wrapper for pointer-indexed maps/sets
Use `ptr::eq` for comparing pointers
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// Copyright 2018 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. | ||
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use std::{hash, ptr}; | ||
use std::ops::Deref; | ||
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/// A wrapper around reference that compares and hashes like a pointer. | ||
/// Can be used as a key in sets/maps indexed by pointers to avoid `unsafe`. | ||
#[derive(Debug)] | ||
pub struct PtrKey<'a, T: 'a>(pub &'a T); | ||
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impl<'a, T> Clone for PtrKey<'a, T> { | ||
fn clone(&self) -> Self { *self } | ||
} | ||
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impl<'a, T> Copy for PtrKey<'a, T> {} | ||
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impl<'a, T> PartialEq for PtrKey<'a, T> { | ||
fn eq(&self, rhs: &Self) -> bool { | ||
ptr::eq(self.0, rhs.0) | ||
} | ||
} | ||
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impl<'a, T> Eq for PtrKey<'a, T> {} | ||
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impl<'a, T> hash::Hash for PtrKey<'a, T> { | ||
fn hash<H: hash::Hasher>(&self, hasher: &mut H) { | ||
(self.0 as *const T).hash(hasher) | ||
} | ||
} | ||
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impl<'a, T> Deref for PtrKey<'a, T> { | ||
type Target = T; | ||
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fn deref(&self) -> &Self::Target { | ||
self.0 | ||
} | ||
} |
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