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42 lines
1.5 KiB
42 lines
1.5 KiB
/*============================================================================
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CMake - Cross Platform Makefile Generator
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Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
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Distributed under the OSI-approved BSD License (the "License");
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see accompanying file Copyright.txt for details.
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This software is distributed WITHOUT ANY WARRANTY; without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the License for more information.
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============================================================================*/
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#include "cmPathLabel.h"
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//----------------------------------------------------------------------------
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cmPathLabel::cmPathLabel(const std::string& label)
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: Label(label), Hash(0)
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{
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// Use a Jenkins one-at-a-time hash with under/over-flow protection
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for(size_t i = 0; i < this->Label.size(); ++i)
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{
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this->Hash += this->Label[i];
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this->Hash += ((this->Hash & 0x003FFFFF) << 10);
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this->Hash ^= ((this->Hash & 0xFFFFFFC0) >> 6);
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}
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this->Hash += ((this->Hash & 0x1FFFFFFF) << 3);
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this->Hash ^= ((this->Hash & 0xFFFFF800) >> 11);
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this->Hash += ((this->Hash & 0x0001FFFF) << 15);
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}
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//----------------------------------------------------------------------------
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bool cmPathLabel::operator < (const cmPathLabel& l) const
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{
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return this->Hash < l.Hash;
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}
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//----------------------------------------------------------------------------
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bool cmPathLabel::operator == (const cmPathLabel& l) const
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{
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return this->Hash == l.Hash;
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}
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