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