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CppDB
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CppDB
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00001 00002 // 00003 // Copyright (C) 2010-2011 Artyom Beilis (Tonkikh) <artyomtnk@yahoo.com> 00004 // 00005 // Distributed under: 00006 // 00007 // the Boost Software License, Version 1.0. 00008 // (See accompanying file LICENSE_1_0.txt or copy at 00009 // http://www.boost.org/LICENSE_1_0.txt) 00010 // 00011 // or (at your opinion) under: 00012 // 00013 // The MIT License 00014 // (See accompanying file MIT.txt or a copy at 00015 // http://www.opensource.org/licenses/mit-license.php) 00016 // 00018 #ifndef CPPDB_NUMERIC_UTIL_H 00019 #define CPPDB_NUMERIC_UTIL_H 00020 00021 #include <cppdb/errors.h> 00022 #include <string> 00023 #include <sstream> 00024 #include <limits> 00025 #include <iomanip> 00026 00027 namespace cppdb { 00028 00035 template<typename T> 00036 T parse_number(std::string const &s,std::istringstream &ss) 00037 { 00038 ss.clear(); 00039 ss.str(s); 00040 if(s.find_first_of(".eEdD")!=std::string::npos) { 00041 long double v; 00042 ss >> v; 00043 if(ss.fail() || !std::ws(ss).eof()) 00044 throw bad_value_cast(); 00045 #ifdef __BORLANDC__ 00046 #pragma warn -8008 // condition always true/false 00047 #pragma warn -8066 // unreachable code 00048 #endif 00049 if(std::numeric_limits<T>::is_integer) { 00050 if(v > std::numeric_limits<T>::max() || v < std::numeric_limits<T>::min()) 00051 throw bad_value_cast(); 00052 } 00053 #ifdef __BORLANDC__ 00054 #pragma warn .8008 00055 #pragma warn .8066 00056 #endif 00057 return static_cast<T>(v); 00058 } 00059 T v; 00060 ss >> v; 00061 if(ss.fail() || !std::ws(ss).eof()) 00062 throw bad_value_cast(); 00063 if( std::numeric_limits<T>::is_integer 00064 && !std::numeric_limits<T>::is_signed 00065 && s.find('-') != std::string::npos 00066 && v!=0) 00067 { 00068 throw bad_value_cast(); 00069 } 00070 return v; 00071 } 00072 00073 00074 } 00075 #endif
1.7.6.1
