#ifndef MAP_VALUE_H

#define MAP_VALUE_H

#include <exception>

#include <functional>

#include <iosfwd>

class MapValue

{

  public:

    friend std::ostream& operator<<(std::ostream &os, const MapValue& v);

    class IllegalOperation : public std::exception

    {

      virtual const char* what() const throw()

      {

        return "Illegal operation.";

      }

    };

    typedef enum

    {

      NUMERIC = 1 << 0,

      STRING  = 1 << 1

    } Type;

  private:

    bool has_value;

    void* p_value;

    MapValue::Type type;

    void clear();

  public:

    MapValue();

    MapValue(double);

    MapValue(std::string);

    MapValue(const char* str);

    MapValue(const MapValue& v);

    MapValue& operator=(const MapValue& v);

    ~MapValue();

    operator std::string() const;

    operator double() const;

    Type getType() const;

    bool hasValue() const;

};

#endif