00001 // 00002 // Copyright (c) 2005-2008 Kenichi Watanabe. 00003 // Copyright (c) 2005-2008 Yasuhiro Watari. 00004 // Copyright (c) 2005-2008 Hironori Ichibayashi. 00005 // Copyright (c) 2008-2009 Kazuo Horio. 00006 // Copyright (c) 2009-2013 Naruki Kurata. 00007 // Copyright (c) 2005-2013 Ryota Shioya. 00008 // Copyright (c) 2005-2013 Masahiro Goshima. 00009 // 00010 // This software is provided 'as-is', without any express or implied 00011 // warranty. In no event will the authors be held liable for any damages 00012 // arising from the use of this software. 00013 // 00014 // Permission is granted to anyone to use this software for any purpose, 00015 // including commercial applications, and to alter it and redistribute it 00016 // freely, subject to the following restrictions: 00017 // 00018 // 1. The origin of this software must not be misrepresented; you must not 00019 // claim that you wrote the original software. If you use this software 00020 // in a product, an acknowledgment in the product documentation would be 00021 // appreciated but is not required. 00022 // 00023 // 2. Altered source versions must be plainly marked as such, and must not be 00024 // misrepresented as being the original software. 00025 // 00026 // 3. This notice may not be removed or altered from any source 00027 // distribution. 00028 // 00029 // 00030 00031 00032 #ifndef SHTTL_HASHER_H 00033 #define SHTTL_HASHER_H 00034 00035 #include <stdexcept> 00036 #include "bit.h" 00037 00038 namespace shttl 00039 { 00040 00041 00042 template<typename T> 00043 class hasher 00044 { 00045 public: 00046 00047 // Types 00048 typedef size_t size_type; 00049 00050 #ifdef SHTTL_DEBUG 00051 00052 virtual ~hasher() {} 00053 00054 // Member Functions 00055 00056 // index([0, N-1]N) 00057 virtual size_type size() const = 0; 00058 00059 // index (bit) 00060 virtual size_type index(const T& key) const = 0; 00061 00062 // tag (bit) 00063 virtual T tag(const T& key) const = 0; 00064 00065 // indextagkey 00066 virtual T rebuild(const T& tag, size_type index) const = 0; 00067 00068 // lhsrhsv 00069 virtual bool match(const T& lhs, const T&rhs) const = 0; 00070 00071 #endif 00072 00073 }; 00074 00075 } // namespace shttl 00076 00077 #endif // SHTTL_HASHER_H