source: code/branches/FICN/src/xml/String2Number.h @ 458

#ifndef __STRING2NUMBER_H__
#define __STRING2NUMBER_H__

#include <string>
#include <sstream>
#include <iostream>

/**
* String to number conversion
*
* This class converts a number inside a std::string
* into a numeric type number (int,float,double)
* Number in string can be decimal, hexadecimal or octal
*
* @autor Nicolas Perrenoud<nicolape@ee.ethz.ch>
*
* @example
* float f; 
* String2Number<float>(f, std::string(" 123.45 "));
*/
template <class T>
class String2Number
{
private:
        bool success_;
public:
        /**
        * Constructor
        *
        * First value is the target variable, the second vector is the
        * string where the number is taken from, the third parameter 
        * should be one of std::hex, std::dec or std::oct (dec is default value)
        */
        String2Number(T& t, const std::string& s, std::ios_base& (*f)(std::ios_base&) =  std::dec, int haltOnError=1)
        {
          std::istringstream iss(s);
          success_ = !(iss >> f >> t).fail();
          
          if (!success_ && haltOnError==1)
          {
                std::cout << "Conversion error from string to number in \"" << s << "\"" << std::endl;
                exit(1);
          }
        }
};

#endif