| /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| * vim: set ts=8 sw=4 et tw=78: |
| * |
| * 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/. */ |
| |
| #ifndef mozilla_Range_h_ |
| #define mozilla_Range_h_ |
| |
| #include "mozilla/NullPtr.h" |
| #include "mozilla/RangedPtr.h" |
| |
| #include <stddef.h> |
| |
| namespace mozilla { |
| |
| // Range<T> is a tuple containing a pointer and a length. |
| template <typename T> |
| class Range |
| { |
| RangedPtr<T> mStart; |
| RangedPtr<T> mEnd; |
| |
| typedef void (Range::* ConvertibleToBool)(); |
| void nonNull() {} |
| |
| public: |
| Range() : mStart(nullptr, 0), mEnd(nullptr, 0) {} |
| Range(T* p, size_t len) |
| : mStart(p, p, p + len), |
| mEnd(p + len, p, p + len) |
| {} |
| |
| RangedPtr<T> start() const { return mStart; } |
| RangedPtr<T> end() const { return mEnd; } |
| size_t length() const { return mEnd - mStart; } |
| |
| T& operator[](size_t offset) { |
| return mStart[offset]; |
| } |
| |
| operator ConvertibleToBool() const { return mStart ? &Range::nonNull : 0; } |
| }; |
| |
| } // namespace mozilla |
| |
| #endif // mozilla_Range_h_ |
| |