/* * 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