| 1 | /*
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| 2 | * Copyright (c) 2009, Google Inc. All rights reserved.
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| 3 | *
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| 4 | * Redistribution and use in source and binary forms, with or without
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| 5 | * modification, are permitted provided that the following conditions are
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| 6 | * met:
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| 7 | *
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| 8 | * * Redistributions of source code must retain the above copyright
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| 9 | * notice, this list of conditions and the following disclaimer.
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| 10 | * * Redistributions in binary form must reproduce the above
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| 11 | * copyright notice, this list of conditions and the following disclaimer
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| 12 | * in the documentation and/or other materials provided with the
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| 13 | * distribution.
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| 14 | * * Neither the name of Google Inc. nor the names of its
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| 15 | * contributors may be used to endorse or promote products derived from
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| 16 | * this software without specific prior written permission.
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| 17 | *
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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| 19 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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| 20 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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| 21 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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| 22 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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| 23 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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| 24 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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| 28 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 29 | */
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| 30 |
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| 31 | #ifndef PtrAndFlags_h
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| 32 | #define PtrAndFlags_h
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| 33 |
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| 34 | #include <wtf/Assertions.h>
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| 35 |
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| 36 | namespace WTF {
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| 37 | template<class T, typename FlagEnum> class PtrAndFlags {
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| 38 | public:
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| 39 | PtrAndFlags() : m_ptrAndFlags(0) {}
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| 40 |
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| 41 | bool isFlagSet(FlagEnum flagNumber) const { ASSERT(flagNumber < 2); return m_ptrAndFlags & (1 << flagNumber); }
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| 42 | void setFlag(FlagEnum flagNumber) { ASSERT(flagNumber < 2); m_ptrAndFlags |= (1 << flagNumber);}
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| 43 | void clearFlag(FlagEnum flagNumber) { ASSERT(flagNumber < 2); m_ptrAndFlags &= ~(1 << flagNumber);}
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| 44 | T* get() const { return reinterpret_cast<T*>(m_ptrAndFlags & ~3); }
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| 45 | void set(T* ptr) { ASSERT(!(reinterpret_cast<intptr_t>(ptr) & 3)); m_ptrAndFlags = reinterpret_cast<intptr_t>(ptr) | (m_ptrAndFlags & 3);}
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| 46 | private:
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| 47 | intptr_t m_ptrAndFlags;
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| 48 | };
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| 49 | } // namespace WTF
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| 50 |
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| 51 | using WTF::PtrAndFlags;
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| 52 |
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| 53 | #endif // PtrAndFlags_h
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