mfbt/Opaque.h
author J.C. Jones <jjones@mozilla.com>
Fri, 14 Dec 2018 19:40:03 +0000
changeset 450794 5dd52dc4e291a4e099f18dc718cb958f99b999eb
parent 448947 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1514247 - Upgrade u2f-hid-rs to 0.2.3 r=emilio,keeler This patch moves u2f-hid-rs to 0.2.3 [1], which changes the dependency graph of u2f-hid-rs to not directly rely on the low-level core-foundation-sys library, as core-foundation has all the features u2f-hid-rs needs in 0.6.1+. This patch vendors core-foundation 0.6.3 and core-foundation-sys 0.6.2 as a consequence. [1] https://github.com/jcjones/u2f-hid-rs/releases/tag/v0.2.3 [2] https://github.com/jcjones/u2f-hid-rs/commit/d1d36d10442b0850f5ea9f5111a41b519fc5fee4 Differential Revision: https://phabricator.services.mozilla.com/D14569

/* -*- 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 "mozilla/TypeTraits.h"

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(mozilla::IsIntegral<T>::value,
                "mozilla::Opaque only supports integral types");

  T mValue;

 public:
  Opaque() {}
  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 */