зеркало из https://github.com/mozilla/gecko-dev.git
42 строки
1.1 KiB
C++
42 строки
1.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
/* An opaque integral type supporting only comparison operators. */
|
|
|
|
#ifndef mozilla_Opaque_h
|
|
#define mozilla_Opaque_h
|
|
|
|
#include <type_traits>
|
|
|
|
namespace mozilla {
|
|
|
|
/**
|
|
* Opaque<T> is a replacement for integral T in cases where only comparisons
|
|
* must be supported, and it's desirable to prevent accidental dependency on
|
|
* exact values.
|
|
*/
|
|
template <typename T>
|
|
class Opaque final {
|
|
static_assert(std::is_integral_v<T>,
|
|
"mozilla::Opaque only supports integral types");
|
|
|
|
T mValue;
|
|
|
|
public:
|
|
Opaque() = default;
|
|
explicit Opaque(T aValue) : mValue(aValue) {}
|
|
|
|
bool operator==(const Opaque& aOther) const {
|
|
return mValue == aOther.mValue;
|
|
}
|
|
|
|
bool operator!=(const Opaque& aOther) const { return !(*this == aOther); }
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif /* mozilla_Opaque_h */
|