sprint/smart_cast.h

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/******************************************************************************
*   sprint::smart_cast
*
*   Copyright (C) 2005-2011  Paolo Medici <www.pmx.it>
*
*  This library is free software; you can redistribute it and/or
*  modify it under the terms of the GNU Lesser General Public
*  License as published by the Free Software Foundation; either
*  version 2.1 of the License, or (at your option) any later version.
*
*  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  02110-1301  USA
*
*******************************************************************************/

#ifndef _SMART_CAST_H
#define _SMART_CAST_H

#include <cstdlib>
#include <cstdio>
#include <string>
#include "buffer_cast.h"

namespace sprint {

/**** No OverHead per le conversioni const char * a numero 
    *  OverHead fisso per le conversioni numero a const char *
    */

template<class D, class S>
D smart_cast(S s) { return static_cast<D>(s); }

template<class D, class S, class P>
D smart_cast(S s, P p);

template<>
inline int smart_cast<int, const char *>(const char * str) { return atoi(str); }

template<>
inline int smart_cast<int, std::string>(std::string str) { return atoi(str.c_str() ); }

template<>
inline int smart_cast<int, char *>(char * str) { return atoi(str); }

template<>
inline unsigned int smart_cast<unsigned int, const char *>(const char * str) { return atoi(str); }

template<>
inline unsigned int smart_cast<unsigned int, std::string>(std::string str) { return atoi(str.c_str() ); }

template<>
inline unsigned int smart_cast<unsigned int, char *>(char * str) { return atoi(str); }

template<>
inline long smart_cast<long, const char *>(const char *str) { return strtol(str, NULL, 10); }

template<>
inline long smart_cast<long, std::string>(std::string str) { return strtol(str.c_str(), NULL, 10); }

template<>
inline long smart_cast<long, char *>(char *str) { return strtol(str, NULL, 10); }

template<>
inline unsigned long smart_cast<unsigned long, const char *>(const char *str) { return strtoul(str, NULL,10) ; }

template<>
inline unsigned long smart_cast<unsigned long, char *>(char *str) { return strtoul(str, NULL,10) ; }

template<>
inline float smart_cast<float, const char *>(const char *str) { return (float) atof(str); }

template<>
inline float smart_cast<float, std::string>(std::string str) { return (float) atof(str.c_str() ); }

template<>
inline float smart_cast<float, char *>(char *str) { return (float) atof(str); }
 
template<>
inline double smart_cast<double, const char *>(const char *str) { return strtod(str, NULL); }

template<>
inline double smart_cast<double, std::string>(std::string str) { return strtod(str.c_str(), NULL); }

template<>
inline bool smart_cast<bool, std::string>(std::string str) 
       {
       return (str=="true");
       }

template<>
inline const char *smart_cast<const char *, std::string>(std::string str) 
       {
       return str.c_str();
       }

template<>
inline std::string smart_cast<std::string, bool>(bool value) 
       {
       return (value) ? "true" : "false";
       }

template<>
inline const char * smart_cast<const char *, bool>(bool value) 
       {
       return (value) ? "true" : "false";
       }
       
template<>
inline double smart_cast<double, char *>(char *str) { return strtod(str, NULL); }

template<>
inline std::string smart_cast<std::string, int>(int n)
{
 return std::string( buffer_cast(n) );
}

template<>
inline std::string smart_cast<std::string, unsigned int>(unsigned int n)
{
 return std::string( buffer_cast(n) );
}

template<>
inline std::string smart_cast<std::string, long int>(long int n)
{
 return std::string( buffer_cast(n) );
}

template<>
inline std::string smart_cast<std::string, unsigned long int>(unsigned long int n)
{
 return std::string( buffer_cast(n) );
}

template<>
inline std::string smart_cast<std::string, double>(double n)
{
 return std::string( buffer_cast(n) );
}

template<>
inline std::string smart_cast<std::string, double>(double n, int d)
{
return std::string( buffer_cast(n, d) );
}

template<>
inline std::string smart_cast<std::string, float>(float n)
{
 return std::string( buffer_cast(n) );
}

template<>
inline std::string smart_cast<std::string, float>(float n, int d)
{
 return std::string( buffer_cast(n, d) );
}

} // namespace sprint

#endif