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Diffstat (limited to '')
-rw-r--r-- | storage/mroonga/vendor/groonga/lib/dat/entry.hpp | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/storage/mroonga/vendor/groonga/lib/dat/entry.hpp b/storage/mroonga/vendor/groonga/lib/dat/entry.hpp new file mode 100644 index 00000000..ecb9b53e --- /dev/null +++ b/storage/mroonga/vendor/groonga/lib/dat/entry.hpp @@ -0,0 +1,59 @@ +/* -*- c-basic-offset: 2 -*- */ +/* + Copyright(C) 2011-2016 Brazil + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License version 2.1 as published by the Free Software Foundation. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA +*/ + +#pragma once + +#include "dat.hpp" + +namespace grn { +namespace dat { + +// The most significant bit represents whether or not the entry is valid. +// A valid entry stores the position of its associated key and an invalid entry +// stores the index of the next invalid entry. +class GRN_DAT_API Entry { + public: + Entry() : value_(0) {} + + bool is_valid() const { + return (value_ & IS_VALID_FLAG) == IS_VALID_FLAG; + } + UInt32 key_pos() const { + GRN_DAT_DEBUG_THROW_IF(!is_valid()); + return value_ & ~IS_VALID_FLAG; + } + UInt32 next() const { + GRN_DAT_DEBUG_THROW_IF(is_valid()); + return value_; + } + + void set_key_pos(UInt32 x) { + value_ = IS_VALID_FLAG | x; + } + void set_next(UInt32 x) { + value_ = x; + } + + private: + UInt32 value_; + + static const UInt32 IS_VALID_FLAG = 0x80000000U; +}; + +} // namespace dat +} // namespace grn |