1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mfbt/Range.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,51 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim: set ts=8 sts=2 et sw=2 tw=80: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef mozilla_Range_h
1.11 +#define mozilla_Range_h
1.12 +
1.13 +#include "mozilla/NullPtr.h"
1.14 +#include "mozilla/RangedPtr.h"
1.15 +
1.16 +#include <stddef.h>
1.17 +
1.18 +namespace mozilla {
1.19 +
1.20 +// Range<T> is a tuple containing a pointer and a length.
1.21 +template <typename T>
1.22 +class Range
1.23 +{
1.24 + RangedPtr<T> mStart;
1.25 + RangedPtr<T> mEnd;
1.26 +
1.27 + typedef void (Range::* ConvertibleToBool)();
1.28 + void nonNull() {}
1.29 +
1.30 + public:
1.31 + Range() : mStart(nullptr, 0), mEnd(nullptr, 0) {}
1.32 + Range(T* p, size_t len)
1.33 + : mStart(p, p, p + len),
1.34 + mEnd(p + len, p, p + len)
1.35 + {}
1.36 +
1.37 + RangedPtr<T> start() const { return mStart; }
1.38 + RangedPtr<T> end() const { return mEnd; }
1.39 + size_t length() const { return mEnd - mStart; }
1.40 +
1.41 + T& operator[](size_t offset) {
1.42 + return mStart[offset];
1.43 + }
1.44 +
1.45 + const T& operator[](size_t offset) const {
1.46 + return mStart[offset];
1.47 + }
1.48 +
1.49 + operator ConvertibleToBool() const { return mStart ? &Range::nonNull : 0; }
1.50 +};
1.51 +
1.52 +} // namespace mozilla
1.53 +
1.54 +#endif /* mozilla_Range_h */
