Utilities/STL/LineStringTo.h

Go to the documentation of this file.

#ifndef _utl_LineStringTo_h_
#define _utl_LineStringTo_h_

#include <boost/lexical_cast.hpp>
#include <boost/algorithm/string/trim.hpp>
#include <string>
#include <iostream>


namespace utl {

  template<class T, bool throwOnError = true, bool complain = true>
  struct LineStringTo : public T {
    LineStringTo& operator=(const T& t)
    { T::operator=(t); return *this; }

    friend
    std::istream&
    operator>>(std::istream& is, LineStringTo& obj)
    {
      std::string line;
      if (std::getline(is, line)) {
        boost::algorithm::trim(line);
        try {
          obj = boost::lexical_cast<T>(line);
        } catch (const boost::bad_lexical_cast& e) {
          if (complain)
            std::cerr << "line '" << line << "' could not be converted" << std::endl;
          obj = T();
          if (throwOnError)
            throw e;
        }
      }
      return is;
    }
  };

}


#endif