JCSV.hh

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#ifndef __JLANG__JCSV__
#define __JLANG__JCSV__

#include <iterator>

#include "JLang/JClass.hh"
#include "JLang/JSTDTypes.hh"
#include "JLang/JSTDObjectWriter.hh"


/**
 * \file
 *
 * Utility method to assign multiple values to STD container.
 *
 * \code{.cpp}
 #include <set>
 
 #include "JLang/JCSV.hh"
 
 using namespace std;
 using namespace JLANG;
 
 set<double> buffer;
 
 assign(buffer) = 1.1, 9.9, 8.8, 7.7;
 \endcode
 * \author mdejong
*/

namespace JLANG {}
namespace JPP { using namespace JLANG; }

namespace JLANG {

  /**
   * Auxiliary class to assign a sequence of Comma Separated Values (CSV).
   */ 
  template<class T>
  class JAssignSequence :
    public JSTDObjectWriter<T>
  {
  protected:

    typedef typename JClass<T>::argument_type               argument_type;


    /**
     * Auxiliary class to assign the remainder of a sequence of Comma Separated Values.
     */ 
    struct JCSV :
      public JSTDObjectWriter<T>
    {
      /**
       * Constructor
       *
       * \param out         output iterator
       */
      JCSV(const JSTDObjectWriter<T>& out) :
        JSTDObjectWriter<T>(out)
      {}
        
        
      /**
       * Iterator assignment.
       *
       * \param  value       value
       * \return             value parser
       */
      JCSV& operator,(argument_type value)
      {
        this->put(value);
          
        return *this;
      }
    };

  public:
    /**
     * Constructor
     *
     * \param  out         output iterator
     */
    JAssignSequence(const JSTDObjectWriter<T>& out) :
      JSTDObjectWriter<T>(out)
    {}


    /**
     * Assignment operator.
     *
     * This operator assigns the first of a sequence of Comma Separated Values and
     * returns the corresponding object to assign the remainder of this sequence.
     *
     * \param  value       value
     * \return             value parser
     */
    JCSV operator=(argument_type value)
    {
      this->put(value);

      return JCSV(*this);
    }
  };


  /**
   * Helper method to assign sequence of Comma Separated Values to output iterator.
   *
   * \param  out         output iterator
   * \return             value assigner
   */
  template<class JOutputIterator_t>
  JAssignSequence<typename JOutputIterator_t::container_type::value_type> iter_assign(const JOutputIterator_t& out)
  {
    typedef typename JOutputIterator_t::container_type::value_type  value_type;
    
    return JAssignSequence<value_type>(JSTDObjectWriter<value_type>(JSTDObjectOutput<JOutputIterator_t>(out)));
  }


  /**
   * Helper method to assign sequence of Comma Separated Values to output container.
   *
   * \param  out         output container
   * \return             value assigner
   */
  template<class JContainer_t>
  JAssignSequence<typename JContainer_t::value_type> assign(JContainer_t& out)
  {
    typedef typename JContainer_t::value_type  value_type;
    
    return JAssignSequence<value_type>(JSTDObjectWriter<value_type>(out));
  }


  /**
   * Helper method to assign sequence of Comma Separated Values to output iterator.
   *
   * \param  out         output iterator
   * \return             value assigner
   */
  template<class JOutputIterator_t>
  JAssignSequence<typename JOutputIterator_t::container_type::value_type> assign(const JOutputIterator_t& out)
  {
    return iter_assign(out);
  }
}

#endif