mfbt/Opaque.h
author KuoE0 <kuoe0.tw@gmail.com>
Mon, 09 Jan 2017 17:24:08 +0800
changeset 458402 d41196b0e0d4f448f174f5326138efdb44a37413
parent 344169 967dcb05f34702b5fdbc12892c3f92d67fc3450a
child 489668 cbb8fdf1daf98a15f7d57f6b08d273bdf96aa1a0
child 648192 c236dfe7dc98c387219d7cb45d0693560db708fd
child 694109 98e2b4ee9775a2a2b5cc1bb8a390bfe901814f38
permissions -rw-r--r--
Bug 1329381 - (Part 2) Use the same format like the computed value as the speicified value for background-repeat. r?boris MozReview-Commit-ID: 7vQiivFm1SS

/* -*- 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 */