| /* |
| * Copyright (C) 2014 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef Range_h |
| #define Range_h |
| |
| #include <algorithm> |
| #include <cstddef> |
| |
| namespace bmalloc { |
| |
| class Range { |
| public: |
| Range() |
| : m_begin(0) |
| , m_size(0) |
| { |
| } |
| |
| Range(void* start, size_t size) |
| : m_begin(static_cast<char*>(start)) |
| , m_size(size) |
| { |
| } |
| |
| char* begin() const { return m_begin; } |
| char* end() const { return m_begin + m_size; } |
| size_t size() const { return m_size; } |
| |
| bool operator!() const { return !m_size; } |
| explicit operator bool() const { return !!*this; } |
| bool operator<(const Range& other) const { return m_begin < other.m_begin; } |
| |
| private: |
| char* m_begin; |
| size_t m_size; |
| }; |
| |
| inline bool canMerge(const Range& a, const Range& b) |
| { |
| return a.begin() == b.end() || a.end() == b.begin(); |
| } |
| |
| inline Range merge(const Range& a, const Range& b) |
| { |
| return Range(std::min(a.begin(), b.begin()), a.size() + b.size()); |
| } |
| |
| } // namespace bmalloc |
| |
| #endif // Range_h |