IterationPack_CastIQMember.hpp

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#ifndef CAST_IQ_MEMBER_H
#define CAST_IQ_MEMBER_H

#include <limits.h>

#include <typeinfo>

#include "IterationPack_AlgorithmState.hpp"
#include "IterationPack_IterQuantityAccess.hpp"

namespace IterationPack {

class CastIQMemberBase {
public:
  const std::string& iq_name() const;
  bool exists_in( const AlgorithmState& s ) const;
protected:
  CastIQMemberBase( const std::string iq_name );
  void cache_iq_id( const AlgorithmState& s ) const;
  void throw_cast_error( const AlgorithmState::iq_id_type iq_id, const std::string& iqa_name ) const;
  const std::string         iq_name_;
  mutable AlgorithmState::iq_id_type  iq_id_;
private:
  enum { NOT_SET_YET = AlgorithmState::DOES_NOT_EXIST - 1 };
  CastIQMemberBase(); // not defined and not to be called.
};  // end class CastIQMemberBase

template < class T >
class CastIQMember : public CastIQMemberBase {
public:
  CastIQMember( const std::string iq_name );
  IterQuantityAccess<T>& operator()( AlgorithmState& s ) const;
  const IterQuantityAccess<T>& operator()( const AlgorithmState& s ) const;
private:
  CastIQMember(); // not defined and not to be called
};  // end class CastIQMember<T>

// //////////////////////////////////////////
// Definition of template members

template < class T >
CastIQMember<T>::CastIQMember( const std::string iq_name )
  :  CastIQMemberBase(iq_name)
{}

template < class T >
IterQuantityAccess<T>&
CastIQMember<T>::operator()( AlgorithmState& s ) const
{
  cache_iq_id(s);
  if( iq_id_ == AlgorithmState::DOES_NOT_EXIST )
    throw_cast_error(iq_id_,TypeNameTraits<T>::name());
  IterQuantityAccess<T>
    *p = dynamic_cast<IterQuantityAccess<T>*>( &s.iter_quant( iq_id_ ) );
  if( !p )
    throw_cast_error(iq_id_,TypeNameTraits<T>::name());
  return *p;  
}

template < class T >
const IterQuantityAccess<T>&
CastIQMember<T>::operator()( const AlgorithmState& s ) const
{
  cache_iq_id(s);
  if( iq_id_ == AlgorithmState::DOES_NOT_EXIST )
    throw_cast_error(iq_id_,TypeNameTraits<T>::name());
  const IterQuantityAccess<T>
    *p = dynamic_cast<const IterQuantityAccess<T>*>( &s.iter_quant( iq_id_ ) );
  if( !p )
    throw_cast_error(iq_id_,TypeNameTraits<T>::name());
  return *p;  
}

} // namespace IterationPack

#endif  // CAST_IQ_MEMBER_H