source: code/branches/tutorial/src/util/String2Number.h @ 859

#ifndef _String2Number_H__
#define _String2Number_H__

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

#include "core/Debug.h"

/**
 * 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
 *
 * @author 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)
   */
  inline 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)
    {
      COUT(1) << "Error: Conversion from string to number in \"" << s << "\" failed." << std::endl;
      exit(1);
    }
  }
};

#endif /* _String2Number_H__ */