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/*
* Copyright 2019 The Starlark in Rust Authors.
* Copyright (c) Facebook, Inc. and its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
use std::marker::PhantomData;
use allocative::Allocative;
use dupe::Dupe;
use crate::values::layout::pointer::RawPointer;
use crate::values::Value;
/// An opaque value representing the identity of a given Value. Two values have the same identity
/// if and only if [`Value::ptr_eq`] would return [`true`] on them.
#[derive(Eq, PartialEq, Copy, Clone, Dupe, Hash, Debug, Allocative)]
pub struct ValueIdentity<'v> {
identity: RawPointer,
phantom: PhantomData<&'v ()>,
}
impl<'v> ValueIdentity<'v> {
#[inline]
pub(crate) fn new(value: Value<'v>) -> ValueIdentity<'v> {
ValueIdentity {
identity: value.ptr_value(),
phantom: PhantomData,
}
}
}