/*
 * ValuePrinter.hpp
 *
 *  Created on: Aug 3, 2012
 *      Author: heber
 */

#ifndef VALUEPRINTER_HPP_
#define VALUEPRINTER_HPP_


// include config.h
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <boost/fusion/container/map.hpp>
#include <iomanip>
#include <sstream>
#include <string>

#include "CodePatterns/toString.hpp"

/** ValuePrinter prints the value for one row in a table of values each associated to a
 * specific boost::fusion-style key \a MapKey.
 *
 * This is made such that we may use boost::mpl::for_each to quickly create
 * the value line if specialized printName()s and a boost::fusion::vector
 * containing all these keys is present
 */
template <typename MapType, int numprecision=5>
struct ValuePrinter {
  ValuePrinter(const MapType &_instance, const size_t level) :
    instance(_instance),
    value(toString(level))
  {}

  template <typename MapKey>
  void operator()(MapKey &) {
    //typedef typename boost::fusion::result_of::value_at_key<MapType, MapKey>::type MapValue;
    std::stringstream valuestream;
    valuestream << std::setprecision(numprecision) << boost::fusion::at_key<MapKey>(instance);
    value += std::string("\t") + valuestream.str();
  }

  const std::string &get() const {
    return value;
  }

private:
  const MapType &instance;
  std::string value;
};


#endif /* VALUEPRINTER_HPP_ */