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