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69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
/*
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* Copyright (C) 2012 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 SKY_ENGINE_WTF_BITARRAY_H_
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#define SKY_ENGINE_WTF_BITARRAY_H_
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#include <string.h>
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#include "sky/engine/wtf/Assertions.h"
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namespace WTF {
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template<unsigned arraySize>
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class BitArray {
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public:
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BitArray(bool value = false)
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{
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memset(m_data, value ? 0xFF : 0, sizeof(m_data));
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}
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void set(unsigned index)
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{
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ASSERT_WITH_SECURITY_IMPLICATION(index < arraySize);
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m_data[index / 8] |= 1 << (index & 7);
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}
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void clear(unsigned index)
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{
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ASSERT_WITH_SECURITY_IMPLICATION(index < arraySize);
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m_data[index / 8] &= ~(1 << (index & 7));
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}
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bool get(unsigned index) const
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{
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ASSERT_WITH_SECURITY_IMPLICATION(index < arraySize);
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return !!(m_data[index / 8] & (1 << (index & 7)));
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}
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private:
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unsigned char m_data[arraySize / 8 + 1];
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};
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} // namespace WTF
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using WTF::BitArray;
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#endif // SKY_ENGINE_WTF_BITARRAY_H_
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