The Tor Browser: mfbt/Range.h@97036ab72558

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */

     3 /* This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #ifndef mozilla_Range_h

     8 #define mozilla_Range_h

    10 #include "mozilla/NullPtr.h"

    11 #include "mozilla/RangedPtr.h"

    13 #include <stddef.h>

    15 namespace mozilla {

    17 // Range<T> is a tuple containing a pointer and a length.

    18 template <typename T>

    19 class Range

    20 {

    21     RangedPtr<T> mStart;

    22     RangedPtr<T> mEnd;

    24     typedef void (Range::* ConvertibleToBool)();

    25     void nonNull() {}

    27   public:

    28     Range() : mStart(nullptr, 0), mEnd(nullptr, 0) {}

    29     Range(T* p, size_t len)

    30       : mStart(p, p, p + len),

    31         mEnd(p + len, p, p + len)

    32     {}

    34     RangedPtr<T> start() const { return mStart; }

    35     RangedPtr<T> end() const { return mEnd; }

    36     size_t length() const { return mEnd - mStart; }

    38     T& operator[](size_t offset) {

    39       return mStart[offset];

    40     }

    42     const T& operator[](size_t offset) const {

    43       return mStart[offset];

    44     }

    46     operator ConvertibleToBool() const { return mStart ? &Range::nonNull : 0; }

    47 };

    49 } // namespace mozilla

    51 #endif /* mozilla_Range_h */

The Tor Browser / file revision

mfbt/Range.h@97036ab72558

mfbt/Range.h