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compare.h

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00008 /***********************************************************************
00009  Copyright (c) 1998 by Kevin Atkinson, (c) 1999, 2000 and 2001 by
00010  MySQL AB, and (c) 2004, 2005 by Educational Technology Resources, Inc.
00011  Others may also hold copyrights on code in this file.  See the CREDITS
00012  file in the top directory of the distribution for details.
00013 
00014  This file is part of MySQL++.
00015 
00016  MySQL++ is free software; you can redistribute it and/or modify it
00017  under the terms of the GNU Lesser General Public License as published
00018  by the Free Software Foundation; either version 2.1 of the License, or
00019  (at your option) any later version.
00020 
00021  MySQL++ is distributed in the hope that it will be useful, but WITHOUT
00022  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00023  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
00024  License for more details.
00025 
00026  You should have received a copy of the GNU Lesser General Public
00027  License along with MySQL++; if not, write to the Free Software
00028  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
00029  USA
00030 ***********************************************************************/
00031 
00032 #ifndef MYSQLPP_COMPARE_H
00033 #define MYSQLPP_COMPARE_H
00034 
00035 #include "row.h"
00036 
00037 #include <cstring>
00038 #include <functional>
00039 
00040 namespace mysqlpp {
00041 
00046 
00047 template <class BinaryPred, class CmpType>
00048 class MysqlCmp : public std::unary_function<const Row&, bool>
00049 {
00050 protected:
00052         unsigned int index;
00053 
00055         BinaryPred func;
00056 
00058         CmpType cmp2;
00059         
00060 public:
00068         MysqlCmp(uint i, const BinaryPred& f,
00069                         const CmpType& c) :
00070         index(i),
00071         func(f),
00072         cmp2(c)
00073         {
00074         }
00075         
00080         bool operator ()(const Row& cmp1) const
00081         {
00082                 return func(cmp2, cmp1[this->index]);
00083         }
00084 };
00085 
00086 
00090 
00091 template <class BinaryPred>
00092 class MysqlCmpCStr : public MysqlCmp<BinaryPred, const char*>
00093 {
00094 public:
00102         MysqlCmpCStr(uint i, const BinaryPred& f,
00103                         const char *c) :
00104         MysqlCmp<BinaryPred, const char*>(i, f, c)
00105         {
00106         }
00107         
00112         bool operator ()(const Row& cmp1) const
00113         {
00114                 return MysqlCmp<BinaryPred, const char*>::func(
00115                                 MysqlCmp<BinaryPred, const char*>::cmp2,
00116                                 cmp1[this->index]);
00117         }
00118 };
00119 
00120 
00130 template <class BinaryPred, class CmpType> MysqlCmp<BinaryPred, CmpType>
00131 mysql_cmp(uint i, const BinaryPred& func, const CmpType& cmp2)
00132 {
00133         return MysqlCmp<BinaryPred, CmpType>(i, func, cmp2);
00134 }
00135 
00136 
00147 template <class BinaryPred> MysqlCmpCStr<BinaryPred>
00148 mysql_cmp_cstr(uint i, const BinaryPred& func, const char* cmp2)
00149 {
00150         return MysqlCmpCStr<BinaryPred>(i, func, cmp2);
00151 }
00152 
00153 
00155 
00156 typedef std::binary_function<const char*, const char*, bool>
00157                 bin_char_pred;
00158 
00159 
00162 struct cstr_equal_to : bin_char_pred
00163 {
00164 #if !defined(DOXYGEN_IGNORE)
00165 // Doxygen will not generate documentation for this section.
00166         bool operator ()(const char* x, const char* y) const
00167         {
00168                 return !std::strcmp(x, y);
00169         }
00170 #endif // !defined(DOXYGEN_IGNORE)
00171 };
00172 
00173 
00176 struct cstr_not_equal_to : bin_char_pred
00177 {
00178 #if !defined(DOXYGEN_IGNORE)
00179 // Doxygen will not generate documentation for this section.
00180         bool operator ()(const char* x, const char* y) const
00181         {
00182                 return std::strcmp(x, y) != 0;
00183         }
00184 #endif // !defined(DOXYGEN_IGNORE)
00185 };
00186 
00187 
00190 struct cstr_less : bin_char_pred
00191 {
00192 #if !defined(DOXYGEN_IGNORE)
00193 // Doxygen will not generate documentation for this section.
00194         bool operator ()(const char* x, const char* y) const
00195         {
00196                 return std::strcmp(x, y) > 0;
00197         }
00198 #endif // !defined(DOXYGEN_IGNORE)
00199 };
00200 
00201 
00204 struct cstr_less_equal : bin_char_pred
00205 {
00206 #if !defined(DOXYGEN_IGNORE)
00207 // Doxygen will not generate documentation for this section.
00208         bool operator ()(const char* x, const char* y) const
00209         {
00210                 return std::strcmp(x, y) >= 0;
00211         }
00212 #endif // !defined(DOXYGEN_IGNORE)
00213 };
00214 
00215 
00218 struct cstr_greater : bin_char_pred
00219 {
00220 #if !defined(DOXYGEN_IGNORE)
00221 // Doxygen will not generate documentation for this section.
00222         bool operator ()(const char* x, const char* y) const
00223         {
00224                 return std::strcmp(x, y) < 0;
00225         }
00226 #endif // !defined(DOXYGEN_IGNORE)
00227 };
00228 
00229 
00232 struct cstr_greater_equal : bin_char_pred
00233 {
00234 #if !defined(DOXYGEN_IGNORE)
00235 // Doxygen will not generate documentation for this section.
00236         bool operator ()(const char* x, const char* y) const
00237         {
00238                 return std::strcmp(x, y) <= 0;
00239         }
00240 #endif // !defined(DOXYGEN_IGNORE)
00241 };
00242 
00243 
00244 } // end namespace mysqlpp
00245 
00246 #endif

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