rpcregisterhelpers.h

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/* -*- c++ -*- */
/*
 * Copyright 2012,2014 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * GNU Radio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3, or (at your option)
 * any later version.
 *
 * GNU Radio is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifndef RPCREGISTERHELPERS_H
#define RPCREGISTERHELPERS_H

#include <stdio.h>
#include <sstream>
#include <iostream>
#include <gnuradio/rpcserver_booter_base.h>
#include <gnuradio/rpcmanager.h>
#include <gnuradio/rpcserver_selector.h>
#include <gnuradio/rpcserver_base.h>

// Fixes circular dependency issue before including block_registry.h
class rpcbasic_base;
typedef boost::shared_ptr<rpcbasic_base> rpcbasic_sptr;

#include <gnuradio/block_registry.h>


/*********************************************************************
 *   RPC Extractor Base Classes
 ********************************************************************/

/*!
 *\brief Base class for registering a ControlPort Extractor. Acts as
 *       a message acceptor.
 */
template<typename T, typename Tto>
class rpcextractor_base
  : public virtual gr::messages::msg_accepter
{
public:
  rpcextractor_base(T* source, void (T::*func)(Tto)) :
    _source(source), _func(func) {;}
  ~rpcextractor_base() {;}

  void post(pmt::pmt_t which_port, pmt::pmt_t msg) {
    throw std::runtime_error("rpcextractor_base: no post defined for this data type.\n");
  }

protected:
  T* _source;
  void (T::*_func)(Tto);
};

template<typename T>
class rpcextractor_base<T,void>
  : public virtual gr::messages::msg_accepter
{
public:
  rpcextractor_base(T* source, void (T::*func)()) :
    _source(source), _func(func) {;}
  ~rpcextractor_base() {;}

  void post(pmt::pmt_t which_port, pmt::pmt_t msg) {
    throw std::runtime_error("rpcextractor_base: no post defined for this data type.\n");
  }

protected:
  T* _source;
  void (T::*_func)();
};

/*!
 * \brief Templated parent class for registering a ControlPort Extractor.
 */
template<typename T, typename Tto>
class rpcbasic_extractor : public virtual rpcextractor_base<T,Tto>
{
public:
  rpcbasic_extractor(T* source, void (T::*func)(Tto)) :
    rpcextractor_base<T,Tto>(source, func)
  {;}
};


/*********************************************************************
 *   RPC Inserter Base Classes
 ********************************************************************/

/*!
 * \brief Base class for registering a ControlPort Inserter. Produces a
 *        message.
 */
template<typename T, typename Tfrom>
class rpcinserter_base : public virtual gr::messages::msg_producer
{
public:
  rpcinserter_base(T* source, Tfrom (T::*func)()) : _source(source), _func(func) {;}
  rpcinserter_base() {;}

  pmt::pmt_t retrieve() { assert(0); return pmt::pmt_t(); }

protected:
  T* _source;
  Tfrom (T::*_func)();
};


/*!
 * \brief Templated parent class for registering a ControlPort
 * Inserter.
 */
template<typename T, typename Tfrom>
class rpcbasic_inserter :
  public virtual rpcinserter_base<T,Tfrom>
{
public:
  rpcbasic_inserter(T* source, Tfrom (T::*func)()const)
    : rpcinserter_base<T,Tfrom>(source, func)
  {;}

  rpcbasic_inserter(T* source, Tfrom (T::*func)())
    : rpcinserter_base<T,Tfrom>(source, func)
  {;}

  pmt::pmt_t retrieve()
  {
    return pmt::mp((rpcinserter_base<T,Tfrom>::
                    _source->*rpcinserter_base<T,Tfrom>::_func)());
  }
};



/*********************************************************************
 *   RPC Handler Base Classes
 ********************************************************************/

/*!
 *\brief Base class for registering a ControlPort Handler. Acts as
 *       a message acceptor.
 */
template<typename T>
class rpchandler_base
  : public virtual gr::messages::msg_accepter
{
public:
  rpchandler_base(T* source, const char* handler) :
    _source(source), _handler(handler) {;}
  ~rpchandler_base() {;}

  void post(pmt::pmt_t which_port, pmt::pmt_t msg) {
    _source->post(which_port, msg);
  }

protected:
  T* _source;
  const char* _handler;
};


/*!
 * \brief Templated parent class for registering a ControlPort Extractor.
 */
template<typename T>
class rpcbasic_handler : public virtual rpchandler_base<T>
{
public:
  rpcbasic_handler(T* source, const char* handler) :
    rpchandler_base<T>(source, handler)
  {;}
};




/*********************************************************************
 *   RPC Specialized Extractors
 ********************************************************************/

/*!
 * \brief Specialized extractor class to make calls to functions that
 * do not take data (enable, reset, start, etc.).
 */
template<typename T>
class rpcbasic_extractor<T,void> : public virtual rpcextractor_base<T,void>
{
public:
  rpcbasic_extractor(T* source, void (T::*func)())
    : rpcextractor_base<T,void>(source, func)
  {;}

  void post(pmt::pmt_t which_port, pmt::pmt_t msg)
  {
    (rpcextractor_base<T,void>::_source->*rpcextractor_base<T,void>::_func)();
  }
};

/*!
 * \brief Specialized extractor class for char data.
 */
template<typename T>
class rpcbasic_extractor<T,char> : public virtual rpcextractor_base<T,char>
{
public:
  rpcbasic_extractor(T* source, void (T::*func)(char))
    : rpcextractor_base<T,char>(source, func)
  {;}

  void post(pmt::pmt_t which_port, pmt::pmt_t msg)
  {
    (rpcextractor_base<T,char>::_source->*rpcextractor_base<T,char>::_func)
      (static_cast<char>(pmt::to_long(msg)));
  }
};

/*!
 * \brief Specialized extractor class for short data.
 */
template<typename T>
class rpcbasic_extractor<T,short> : public virtual rpcextractor_base<T,short>
{
public:
  rpcbasic_extractor(T* source, void (T::*func)(short))
    : rpcextractor_base<T,short>(source, func)
  {;}

  void post(pmt::pmt_t which_port, pmt::pmt_t msg)
  {
    (rpcextractor_base<T,short>::_source->*rpcextractor_base<T,short>::_func)
      (static_cast<short>(pmt::to_long(msg)));
  }
};

/*!
 * \brief Specialized extractor class for double data.
 */
template<typename T>
class rpcbasic_extractor<T,double> : public virtual rpcextractor_base<T,double>
{
public:
  rpcbasic_extractor(T* source, void (T::*func)(double))
    : rpcextractor_base<T,double>(source, func)
  {;}

  void post(pmt::pmt_t which_port, pmt::pmt_t msg)
  {
    (rpcextractor_base<T,double>::_source->*rpcextractor_base<T,double>::_func)
      (pmt::to_double(msg));
  }
};

/*!
 * \brief Specialized extractor class for float data.
 */
template<typename T>
class rpcbasic_extractor<T,float> : public virtual rpcextractor_base<T,float>
{
public:
  rpcbasic_extractor(T* source, void (T::*func)(float))
    : rpcextractor_base<T,float>(source, func)
  {;}

  void post(pmt::pmt_t which_port, pmt::pmt_t msg)
  {
    (rpcextractor_base<T,float>::_source->*rpcextractor_base<T,float>::_func)
      (pmt::to_double(msg));
  }
};

/*!
 * \brief Specialized extractor class for long data.
 */
template<typename T>
class rpcbasic_extractor<T,long> : public virtual rpcextractor_base<T,long>
{
public:
  rpcbasic_extractor(T* source, void (T::*func)(long))
    : rpcextractor_base<T,long>(source, func)
  {;}

  void post(pmt::pmt_t which_port, pmt::pmt_t msg)
  {
    (rpcextractor_base<T,long>::_source->*rpcextractor_base<T,long>::_func)
      (pmt::to_long(msg));
  }
};

/*!
 * \brief Specialized extractor class for int data.
 */
template<typename T>
class rpcbasic_extractor<T,int> : public virtual rpcextractor_base<T,int>
{
public:
  rpcbasic_extractor(T* source, void (T::*func)(int))
    : rpcextractor_base<T,int>(source, func)
  {;}

  void post(pmt::pmt_t which_port, pmt::pmt_t msg)
  {
    (rpcextractor_base<T,int>::_source->*rpcextractor_base<T,int>::_func)
      (pmt::to_long(msg));
  }
};

/*!
 * \brief Specialized extractor class for bool data.
 */
template<typename T>
class rpcbasic_extractor<T,bool> : public virtual rpcextractor_base<T,bool>
{
public:
  rpcbasic_extractor(T* source, void (T::*func)(bool))
    : rpcextractor_base<T,bool>(source, func)
  {;}

  void post(pmt::pmt_t which_port, pmt::pmt_t msg)
  {
    (rpcextractor_base<T,bool>::_source->*rpcextractor_base<T,bool>::_func)
      (pmt::to_bool(msg));
  }
};

/*!
 * \brief Specialized extractor class for complex (float) data.
 */
template<typename T>
class rpcbasic_extractor<T,std::complex<float> >
  : public virtual rpcextractor_base<T,std::complex<float> >
{
public:
  rpcbasic_extractor(T* source, void (T::*func)(std::complex<float>))
    : rpcextractor_base<T,std::complex<float> >(source, func)
  {;}

  void post(pmt::pmt_t which_port, pmt::pmt_t msg)
  {
    std::complex<float> k = static_cast<std::complex<float> >(pmt::to_complex(msg));
    (rpcextractor_base<T,std::complex<float> >::
     _source->*rpcextractor_base<T,std::complex<float> >::_func)(k);
  }
};

/*!
 * \brief Specialized extractor class for complex (double) data.
 */
template<typename T>
class rpcbasic_extractor<T,std::complex<double> >
  : public virtual rpcextractor_base<T,std::complex<double> >
{
public:
  rpcbasic_extractor(T* source, void (T::*func)(std::complex<double>))
    : rpcextractor_base<T,std::complex<double> >(source, func)
  {;}

  void post(pmt::pmt_t which_port, pmt::pmt_t msg)
  {
    (rpcextractor_base<T,std::complex<double> >::
     _source->*rpcextractor_base<T,std::complex<double> >::_func)(pmt::to_complex(msg));
  }
};

/*!
 * \brief Specialized extractor class for string data.
 */
template<typename T>
class rpcbasic_extractor<T,std::string>
  : public virtual rpcextractor_base<T,std::string>
{
public:
  rpcbasic_extractor(T* source, void (T::*func)(std::string))
    : rpcextractor_base<T,std::string>(source, func)
  {;}

  void post(pmt::pmt_t which_port, pmt::pmt_t msg)
  {
    (rpcextractor_base<T,std::string>::
     _source->*rpcextractor_base<T,std::string>::_func)(pmt::symbol_to_string(msg));
  }
};


/*********************************************************************
 *   RPC Specialized Inserters
 ********************************************************************/

/*!
 * \brief Specialized inserter class for uint64_t data.
 */
template<typename T>
class rpcbasic_inserter<T,uint64_t> : public virtual rpcinserter_base<T,uint64_t>
{
public:
  rpcbasic_inserter(T* source, uint64_t (T::*func)() const)
    : rpcinserter_base<T,uint64_t>(source, func)
  {;}

  rpcbasic_inserter(T* source, uint64_t (T::*func)())
    : rpcinserter_base<T,uint64_t>(source, func)
  {;}

  pmt::pmt_t retrieve()
  {
    return pmt::from_uint64((rpcinserter_base<T,uint64_t>::
                             _source->*rpcinserter_base<T,uint64_t>::_func)());
  }
};

/*!
 * \brief Specialized inserter class for vectors of signed char data.
 */
template<typename T>
class rpcbasic_inserter<T,std::vector< signed char > >
  : public virtual rpcinserter_base<T,std::vector< signed char > >
{
public:
  rpcbasic_inserter(T* source, std::vector< signed char > (T::*func)() const)
    : rpcinserter_base<T,std::vector< signed char > >(source, func)
  {;}

  rpcbasic_inserter(T* source, std::vector< signed char > (T::*func)())
    : rpcinserter_base<T,std::vector< signed char > >(source, func)
  {;}

  pmt::pmt_t retrieve()
  {
    std::vector< signed char >
      vec((rpcinserter_base<T,std::vector< signed char > >::
           _source->*rpcinserter_base<T,std::vector< signed char > >::_func)());
    return pmt::init_s8vector(vec.size(), &vec[0]);
  }
};

/*!
 * \brief Specialized inserter class for vectors of short data.
 */
template<typename T>
class rpcbasic_inserter<T,std::vector< short > >
  : public virtual rpcinserter_base<T,std::vector< short > >
{
public:
  rpcbasic_inserter(T* source, std::vector< short > (T::*func)() const)
    : rpcinserter_base<T,std::vector< short > >(source, func)
  {;}

  rpcbasic_inserter(T* source, std::vector< short > (T::*func)())
    : rpcinserter_base<T,std::vector< short > >(source, func)
  {;}

  pmt::pmt_t retrieve()
  {
    std::vector< short >
      vec((rpcinserter_base<T,std::vector< short > >::
           _source->*rpcinserter_base<T,std::vector< short > >::_func)());
    return pmt::init_s16vector(vec.size(), &vec[0]);
  }
};

/*!
 * \brief Specialized inserter class for vectors of int data.
 */
template<typename T>
class rpcbasic_inserter<T,std::vector< int > >
  : public virtual rpcinserter_base<T,std::vector< int > >
{
public:
  rpcbasic_inserter(T* source, std::vector<int > (T::*func)() const)
    : rpcinserter_base<T,std::vector<int > >(source, func)
  {;}

  rpcbasic_inserter(T* source, std::vector<int > (T::*func)())
    : rpcinserter_base<T,std::vector<int > >(source, func)
  {;}

  pmt::pmt_t retrieve()
  {
    std::vector< int >
      vec((rpcinserter_base<T,std::vector<int > >::
           _source->*rpcinserter_base<T,std::vector< int > >::_func)());
    return pmt::init_s32vector(vec.size(), &vec[0]);
  }
};

/*!
 * \brief Specialized inserter class for vectors of complex (float) data.
 */
template<typename T>
class rpcbasic_inserter<T,std::vector< std::complex<float> > >
  : public virtual rpcinserter_base<T,std::vector< std::complex<float> > >
{
public:
  rpcbasic_inserter(T* source, std::vector<std::complex<float> > (T::*func)() const)
    : rpcinserter_base<T,std::vector<std::complex<float> > >(source, func)
  {;}

  rpcbasic_inserter(T* source, std::vector<std::complex<float> > (T::*func)())
    : rpcinserter_base<T,std::vector<std::complex<float> > >(source, func)
  {;}

  pmt::pmt_t retrieve()
  {
    std::vector< std::complex<float> >
      vec((rpcinserter_base<T,std::vector<std::complex<float> > >::
           _source->*rpcinserter_base<T,std::vector< std::complex<float> > >::_func)());
    return pmt::init_c32vector(vec.size(), &vec[0]);
  }
};

/*!
 * \brief Specialized inserter class for vectors of float data.
 */
template<typename T>
class rpcbasic_inserter<T,std::vector< float> >
  : public virtual rpcinserter_base<T,std::vector< float > >
{
public:
  rpcbasic_inserter(T* source, std::vector<float> (T::*func)() const)
    : rpcinserter_base<T,std::vector<float > >(source, func)
  {;}

  rpcbasic_inserter(T* source, std::vector<float> (T::*func)())
    : rpcinserter_base<T,std::vector<float> >(source, func)
  {;}

  pmt::pmt_t retrieve()
  {
    std::vector< float > vec((rpcinserter_base<T,std::vector<float> >::
              _source->*rpcinserter_base<T,std::vector< float> >::_func)());
    return pmt::init_f32vector(vec.size(), &vec[0]);
  }
};

/*!
 * \brief Specialized inserter class for vectors of uint8_t data.
 */
template<typename T>
class rpcbasic_inserter<T,std::vector< uint8_t> >
  : public virtual rpcinserter_base<T,std::vector< uint8_t > > {
public:
  rpcbasic_inserter(T* source, std::vector<uint8_t> (T::*func)() const)
    : rpcinserter_base<T,std::vector<uint8_t > >(source, func)
  {;}

  rpcbasic_inserter(T* source, std::vector<uint8_t> (T::*func)())
    : rpcinserter_base<T,std::vector<uint8_t> >(source, func)
  {;}

  pmt::pmt_t retrieve()
  {
    std::vector< uint8_t > vec((rpcinserter_base<T,std::vector<uint8_t> >::
        _source->*rpcinserter_base<T,std::vector< uint8_t> >::_func)());
    return pmt::init_u8vector(vec.size(), &vec[0]);
  }
};

/*!
 * \brief Specialized inserter class for complex (float) data.
 */
template<typename T>
class rpcbasic_inserter<T,std::complex<float> >
  : public virtual rpcinserter_base<T,std::complex<float > > {
public:
  rpcbasic_inserter(T* source, std::complex<float> (T::*func)() const)
    : rpcinserter_base<T,std::complex<float> >(source, func)
  {;}

  rpcbasic_inserter(T* source, std::complex<float> (T::*func)())
    : rpcinserter_base<T,std::complex<float> >(source, func)
  {;}

  pmt::pmt_t retrieve()
  {
    std::complex<float > k((rpcinserter_base<T,std::complex<float> >::
                             _source->*rpcinserter_base<T,std::complex<float> >::_func)());
    return pmt::from_complex(k);
  }
};

/*!
 * \brief Specialized inserter class for complex (double) data.
 */
template<typename T>
class rpcbasic_inserter<T,std::complex<double> >
  : public virtual rpcinserter_base<T,std::complex<double > > {
public:
  rpcbasic_inserter(T* source, std::complex<double> (T::*func)() const)
    : rpcinserter_base<T,std::complex<double> >(source, func)
  {;}

  rpcbasic_inserter(T* source, std::complex<double> (T::*func)())
    : rpcinserter_base<T,std::complex<double> >(source, func)
  {;}

  pmt::pmt_t retrieve()
  {
    std::complex<double > k((rpcinserter_base<T,std::complex<double> >::
                             _source->*rpcinserter_base<T,std::complex<double> >::_func)());
    return pmt::from_complex(k);
  }
};

/*!
 * \brief Base class for registering a ControlPort function.
 */
template <typename T>
struct rpc_register_base
{
  rpc_register_base() {count++;}
protected: static int count;
};

/*!
 * Base class to inherit from and create universal shared pointers.
 */
class rpcbasic_base
{
public:
  rpcbasic_base() {}
  virtual ~rpcbasic_base() {};
};



/*********************************************************************
 *   RPC Register Set Classes
 ********************************************************************/

/*!
 * \brief Registers a 'set' function to set a parameter over
 * ControlPort.
 *
 * \details
 *
 * This class allows us to remotely set a value or parameter of the
 * block over ControlPort. The set occurs by calling a setter accessor
 * function of the class, usually set_[variable](), which is passed in
 * as \p function.
 *
 * We can set the (expected) minimum (\p min), maximum (\p max), and
 * default (\p def) of the variables being set. These values are not
 * enforced, however, but can be useful for setting up graphs and
 * other ways of bounding the data.
 *
 * This class also allows us to provide information to the user about
 * the variable being set, such as an appropriate unit (\p units_) as
 * well as a description (\p desc_) about what the variable does.
 *
 * The privilege (\p minpriv_) level is the minimum privilege level a
 * remote must identify with to be able to call this function.
 *
 * We also provide display hints (\p display_), which can be used by
 * the ControlPort client application to know how to best display or
 * even print the data. This is a mask of options for variables set in
 * rpccallbackregister_base.h. The mask is defined by one of the
 * "DisplayType Plotting Types" and or'd with any of the "DisplayType
 * Options" features. See "Display Options" in \ref page_ctrlport for
 * details.
 */
template<typename T, typename Tto>
struct rpcbasic_register_set : public rpcbasic_base
{
  /*!
   * \brief Adds the ability to set the variable over ControlPort.
   *
   * \details
   *
   * This constructor is specifically for gr::block's to use to add
   * settable variables to ControlPort. Generally meant to be used
   * in gr::block::setup_rpc.
   *
   * Uses the block's alias to create the ControlPort interface. This
   * alias is cross-referenced by the global_block_registry (static
   * variable of type gr::block_registry) to get the pointer to the
   * block.
   *
   * \param block_alias  Block's alias; use alias() to get it from the block.
   * \param functionbase The name of the function that we'll access over ControlPort
   * \param function     A function pointer to the real function accessed when called
   *                     something like: &[block class]\::set_[variable]()
   * \param min          Expected minimum value the parameter can hold
   * \param max          Expected maximum value the parameter can hold
   * \param def          Expected default value the parameter can hold
   * \param units_       A string to describe what units to represent the variable with
   * \param desc_        A string to describing the variable.
   * \param minpriv_     The required minimum privilege level
   * \param display_     The display mask
   */
  rpcbasic_register_set(const std::string& block_alias,
                        const char* functionbase,
                        void (T::*function)(Tto),
                        const pmt::pmt_t &min, const pmt::pmt_t &max, const pmt::pmt_t &def,
                        const char* units_ = "",
                        const char* desc_ = "",
                        priv_lvl_t minpriv_ = RPC_PRIVLVL_MIN,
                        DisplayType display_ = DISPNULL)
  {
    d_min = min;
    d_max = max;
    d_def = def;
    d_units = units_;
    d_desc = desc_;
    d_minpriv = minpriv_;
    d_display = display_;
    d_object = dynamic_cast<T*>(global_block_registry.block_lookup(pmt::intern(block_alias)).get());
#ifdef GR_RPCSERVER_ENABLED
    callbackregister_base::configureCallback_t
      extractor(new rpcbasic_extractor<T,Tto>(d_object, function),
                minpriv_, std::string(units_),
                display_, std::string(desc_), min, max, def);
    std::ostringstream oss(std::ostringstream::out);
    oss << block_alias << "::" << functionbase;
    d_id = oss.str();
    //std::cerr << "REGISTERING SET: " << d_id << "  " << desc_ << std::endl;
    rpcmanager::get()->i()->registerConfigureCallback(d_id, extractor);
#endif
  }

  /*!
   * \brief Adds the ability to set the variable over ControlPort.
   *
   * \details
   *
   * Allows us to add non gr::block related objects to
   * ControlPort. Instead of using the block's alias, we give it a \p
   * name and the actual pointer to the object as \p obj. We just need
   * to make sure that the pointer to this object is always valid.
   *
   * \param name         Name of the object being set up for ControlPort access
   * \param functionbase The name of the function that we'll access over ControlPort
   * \param obj          A pointer to the object itself
   * \param function     A function pointer to the real function accessed when called
   *                     something like: &[block class]\::set_[variable]()
   * \param min          Expected minimum value the parameter can hold
   * \param max          Expected maximum value the parameter can hold
   * \param def          Expected default value the parameter can hold
   * \param units_       A string to describe what units to represent the variable with
   * \param desc_        A string to describing the variable.
   * \param minpriv_     The required minimum privilege level
   * \param display_     The display mask
   */
  rpcbasic_register_set(const std::string& name,
                        const char* functionbase,
                        T* obj,
                        void (T::*function)(Tto),
                        const pmt::pmt_t &min, const pmt::pmt_t &max, const pmt::pmt_t &def,
                        const char* units_ = "",
                        const char* desc_ = "",
                        priv_lvl_t minpriv_ = RPC_PRIVLVL_MIN,
                        DisplayType display_ = DISPNULL)
  {
    d_min = min;
    d_max = max;
    d_def = def;
    d_units = units_;
    d_desc = desc_;
    d_minpriv = minpriv_;
    d_display = display_;
    d_object = obj;
#ifdef GR_RPCSERVER_ENABLED
    callbackregister_base::configureCallback_t
      extractor(new rpcbasic_extractor<T,Tto>(d_object, function),
                minpriv_, std::string(units_),
                display_, std::string(desc_), min, max, def);
    std::ostringstream oss(std::ostringstream::out);
    oss << name << "::" << functionbase;
    d_id = oss.str();
    //std::cerr << "REGISTERING SET: " << d_id << "  " << desc_ << std::endl;
    rpcmanager::get()->i()->registerConfigureCallback(d_id, extractor);
#endif
  }

  ~rpcbasic_register_set()
  {
#ifdef GR_RPCSERVER_ENABLED
    rpcmanager::get()->i()->unregisterConfigureCallback(d_id);
#endif
  }


  pmt::pmt_t min() const { return d_min; }
  pmt::pmt_t max() const { return d_max; }
  pmt::pmt_t def() const { return d_def; }
  std::string units() const { return d_units; }
  std::string description() const { return d_desc; }
  priv_lvl_t privilege_level() const { return d_minpriv; }
  DisplayType default_display() const { return d_display; }

  void set_min(pmt::pmt_t p) { d_min = p; }
  void set_max(pmt::pmt_t p) { d_max = p; }
  void set_def(pmt::pmt_t p) { d_def = p; }
  void units(std::string u) { d_units = u; }
  void description(std::string d) { d_desc = d; }
  void privilege_level(priv_lvl_t p) { d_minpriv = p; }
  void default_display(DisplayType d) { d_display = d; }

private:
  std::string d_id;
  pmt::pmt_t d_min, d_max, d_def;
  std::string d_units, d_desc;
  priv_lvl_t d_minpriv;
  DisplayType d_display;
  T *d_object;
};


/*********************************************************************
 *   RPC Register Trigger Classes
 ********************************************************************/

/*!
 * \brief Registers a 'trigger' function to trigger an action over
 * ControlPort.
 *
 * \details
 *
 * This class allows us to set up triggered events or function calls
 * over ControlPort. When used from a ControlPort client, the \p
 * function established here will be activated. Generally, this is
 * meant to enable some kind of trigger or action that a block or
 * object will perform, such as a reset, start, stop, etc.
 *
 * Simpler than the rpcbasic_register_set class, the constructor here
 * only takes a few parameters, mostly because there is not actual
 * variable associated with these function calls. It takes in the
 * information to set up the pointer to the object that has the \p
 * function, a ControlPort name (\p functionbase) for the triggered
 * action, a description (\p desc_), and a privilege level (\p
 * minpriv_).
 */
template<typename T>
struct rpcbasic_register_trigger : public rpcbasic_base
{
  /*!
   * \brief Adds the ability to trigger a function over ControlPort.
   *
   * \details
   *
   * This constructor is specifically for gr::block's to use to add
   * trigger functions to ControlPort. Generally meant to be used
   * in gr::block::setup_rpc.
   *
   * Uses the block's alias to create the ControlPort interface. This
   * alias is cross-referenced by the global_block_registry (static
   * variable of type gr::block_registry) to get the pointer to the
   * block.
   *
   * \param block_alias  Block's alias; use alias() to get it from the block.
   * \param functionbase The name of the function that we'll access over ControlPort
   * \param function     A function pointer to the real function accessed when called
   *                     something like: &[block class]\::set_[variable]
   * \param desc_        A string to describing the variable.
   * \param minpriv_     The required minimum privilege level
   */
  rpcbasic_register_trigger(const std::string& block_alias,
                            const char* functionbase,
                            void (T::*function)(),
                            const char* desc_ = "",
                            priv_lvl_t minpriv_ = RPC_PRIVLVL_MIN)
  {
    d_desc = desc_;
    d_minpriv = minpriv_;
    d_object = dynamic_cast<T*>(global_block_registry.block_lookup(pmt::intern(block_alias)).get());
#ifdef GR_RPCSERVER_ENABLED
    callbackregister_base::configureCallback_t
      extractor(new rpcbasic_extractor<T,void>(d_object, function),
                minpriv_, std::string(desc_));
    std::ostringstream oss(std::ostringstream::out);
    oss << block_alias << "::" << functionbase;
    d_id = oss.str();
    //std::cerr << "REGISTERING TRIGGER: " << d_id << "  " << desc_ << std::endl;
    rpcmanager::get()->i()->registerConfigureCallback(d_id, extractor);
#endif
  }

  /*!
   * \brief Adds the ability to trigger a function over ControlPort.
   *
   * \details
   *
   * Allows us to add non gr::block related objects to
   * ControlPort. Instead of using the block's alias, we give it a \p
   * name and the actual pointer to the object as \p obj. We just need
   * to make sure that the pointer to this object is always valid.
   *
   * \param name         Name of the object being set up for ControlPort access
   * \param functionbase The name of the function that we'll access over ControlPort
   * \param obj          A pointer to the object itself
   * \param function     A function pointer to the real function accessed when called
   *                     something like: &[block class]\::set_[variable]
   * \param desc_        A string to describing the variable.
   * \param minpriv_     The required minimum privilege level
   */
  rpcbasic_register_trigger(const std::string& name,
                            const char* functionbase,
                            T* obj,
                            void (T::*function)(),
                            const char* desc_ = "",
                            priv_lvl_t minpriv_ = RPC_PRIVLVL_MIN)
  {
    d_desc = desc_;
    d_minpriv = minpriv_;
    d_object = obj;
#ifdef GR_RPCSERVER_ENABLED
    callbackregister_base::configureCallback_t
      extractor(new rpcbasic_extractor<T,void>(d_object, function),
                minpriv_, std::string(desc_));
    std::ostringstream oss(std::ostringstream::out);
    oss << name << "::" << functionbase;
    d_id = oss.str();
    //std::cerr << "REGISTERING TRIGGER: " << d_id << "  " << desc_ << std::endl;
    rpcmanager::get()->i()->registerConfigureCallback(d_id, extractor);
#endif
  }

  ~rpcbasic_register_trigger()
  {
#ifdef GR_RPCSERVER_ENABLED
    rpcmanager::get()->i()->unregisterConfigureCallback(d_id);
#endif
  }


  std::string description() const { return d_desc; }
  priv_lvl_t privilege_level() const { return d_minpriv; }

  void description(std::string d) { d_desc = d; }
  void privilege_level(priv_lvl_t p) { d_minpriv = p; }

private:
  std::string d_id;
  std::string d_desc;
  priv_lvl_t d_minpriv;
  T *d_object;
};



/*********************************************************************
 *   RPC Register Get Classes
 ********************************************************************/

/*!
 * \brief Registers a 'get' function to get a parameter over
 * ControlPort.
 *
 * \details
 *
 * This class allows us to remotely get a value or parameter of the
 * block over ControlPort. The get occurs by calling a getter accessor
 * function of the class, usually [variable](), which is passed in
 * as \p function.
 *
 * We can set the (expected) minimum (\p min), maximum (\p max), and
 * default (\p def) of the variables we will get. These values are not
 * enforced, however, but can be useful for setting up graphs and
 * other ways of bounding the data.
 *
 * This class also allows us to provide information to the user about
 * the variable, such as an appropriate unit (\p units_) as well as a
 * description (\p desc_) about what the variable does.
 *
 * The privilege (\p minpriv_) level is the minimum privilege level a
 * remote must identify with to be able to call this function.
 *
 * We also provide display hints (\p display_), which can be used by
 * the ControlPort client application to know how to best display or
 * even print the data. This is a mask of options for variables set in
 * rpccallbackregister_base.h. The mask is defined by one of the
 * "DisplayType Plotting Types" and or'd with any of the "DisplayType
 * Options" features. See "Display Options" in \ref page_ctrlport for
 * details.
 */
template<typename T, typename Tfrom>
class rpcbasic_register_get : public rpcbasic_base
{
public:

  /*!
   * \brief Adds the ability to get the variable over ControlPort.
   *
   * \details
   *
   * This constructor is specifically for gr::block's to use to add
   * gettable variables to ControlPort. Generally meant to be used
   * in gr::block::setup_rpc.
   *
   * Uses the block's alias to create the ControlPort interface. This
   * alias is cross-referenced by the global_block_registry (static
   * variable of type gr::block_registry) to get the pointer to the
   * block.
   *
   * \param block_alias  Block's alias; use alias() to get it from the block.
   * \param functionbase The name of the function that we'll access over ControlPort
   * \param function     A function pointer to the real function accessed when called
   *                     something like: &[block class]\::[variable]()
   * \param min          Expected minimum value the parameter can hold
   * \param max          Expected maximum value the parameter can hold
   * \param def          Expected default value the parameter can hold
   * \param units_       A string to describe what units to represent the variable with
   * \param desc_        A string to describing the variable.
   * \param minpriv_     The required minimum privilege level
   * \param display_     The display mask
   */
  rpcbasic_register_get(const std::string& block_alias,
                        const char* functionbase,
                        Tfrom (T::*function)(),
                        const pmt::pmt_t &min, const pmt::pmt_t &max, const pmt::pmt_t &def,
                        const char* units_ = "",
                        const char* desc_ = "",
                        priv_lvl_t minpriv_ = RPC_PRIVLVL_MIN,
                        DisplayType display_ = DISPNULL)
  {
    d_min = min;
    d_max = max;
    d_def = def;
    d_units = units_;
    d_desc = desc_;
    d_minpriv = minpriv_;
    d_display = display_;
    d_object = dynamic_cast<T*>(global_block_registry.block_lookup(pmt::intern(block_alias)).get());
#ifdef GR_RPCSERVER_ENABLED
    callbackregister_base::queryCallback_t
      inserter(new rpcbasic_inserter<T,Tfrom>(d_object, function),
               minpriv_, std::string(units_), display_, std::string(desc_), min, max, def);
    std::ostringstream oss(std::ostringstream::out);
    oss << block_alias << "::" << functionbase;
    d_id = oss.str();
    //std::cerr << "REGISTERING GET: " << d_id << "  " << desc_ << std::endl;
    rpcmanager::get()->i()->registerQueryCallback(d_id, inserter);
#endif
  }


  /*!
   * \brief Same as rpcbasic_register_get::rpcbasic_register_get that allows using
   * '[variable]() const' getter functions.
   */
  rpcbasic_register_get(const std::string& block_alias,
                        const char* functionbase,
                        Tfrom (T::*function)() const,
                        const pmt::pmt_t &min, const pmt::pmt_t &max, const pmt::pmt_t &def,
                        const char* units_ = "",
                        const char* desc_ = "",
                        priv_lvl_t minpriv_ = RPC_PRIVLVL_MIN,
                        DisplayType display_ = DISPNULL)
  {
    d_min = min;
    d_max = max;
    d_def = def;
    d_units = units_;
    d_desc = desc_;
    d_minpriv = minpriv_;
    d_display = display_;
    d_object = dynamic_cast<T*>(global_block_registry.block_lookup(pmt::intern(block_alias)).get());
#ifdef GR_RPCSERVER_ENABLED
    callbackregister_base::queryCallback_t
      inserter(new rpcbasic_inserter<T,Tfrom>(d_object, (Tfrom (T::*)())function),
               minpriv_, std::string(units_), display_, std::string(desc_), min, max, def);
    std::ostringstream oss(std::ostringstream::out);
    oss << block_alias << "::" << functionbase;
    d_id = oss.str();
    //std::cerr << "REGISTERING GET CONST: " << d_id << "   " << desc_ << "   " << display_ << std::endl;
    rpcmanager::get()->i()->registerQueryCallback(d_id, inserter);
#endif
  }


  /*!
   * \brief Adds the ability to get the variable over ControlPort.
   *
   * \details
   *
   * Allows us to add non gr::block related objects to
   * ControlPort. Instead of using the block's alias, we give it a \p
   * name and the actual pointer to the object as \p obj. We just need
   * to make sure that the pointer to this object is always valid.
   *
   * \param name         Name of the object being set up for ControlPort access
   * \param functionbase The name of the function that we'll access over ControlPort
   * \param obj          A pointer to the object itself
   * \param function     A function pointer to the real function accessed when called
   *                     something like: &[block class]\::set_[variable]()
   * \param min          Expected minimum value the parameter can hold
   * \param max          Expected maximum value the parameter can hold
   * \param def          Expected default value the parameter can hold
   * \param units_       A string to describe what units to represent the variable with
   * \param desc_        A string to describing the variable.
   * \param minpriv_     The required minimum privilege level
   * \param display_     The display mask
   */
  rpcbasic_register_get(const std::string& name,
                        const char* functionbase,
                        T* obj,
                        Tfrom (T::*function)(),
                        const pmt::pmt_t &min, const pmt::pmt_t &max, const pmt::pmt_t &def,
                        const char* units_ = "",
                        const char* desc_ = "",
                        priv_lvl_t minpriv_ = RPC_PRIVLVL_MIN,
                        DisplayType display_ = DISPNULL)
  {
    d_min = min;
    d_max = max;
    d_def = def;
    d_units = units_;
    d_desc = desc_;
    d_minpriv = minpriv_;
    d_display = display_;
    d_object = obj;
#ifdef GR_RPCSERVER_ENABLED
    callbackregister_base::queryCallback_t
      inserter(new rpcbasic_inserter<T,Tfrom>(d_object, function),
               minpriv_, std::string(units_), display_, std::string(desc_), min, max, def);
    std::ostringstream oss(std::ostringstream::out);
    oss << name << "::" << functionbase;
    d_id = oss.str();
    //std::cerr << "REGISTERING GET: " << d_id << "  " << desc_ << std::endl;
    rpcmanager::get()->i()->registerQueryCallback(d_id, inserter);
#endif
  }


  /*!
   * \brief Same as above that allows using '[variable]() const'
   * getter functions.
   */
  rpcbasic_register_get(const std::string& name,
                        const char* functionbase,
                        T* obj,
                        Tfrom (T::*function)() const,
                        const pmt::pmt_t &min, const pmt::pmt_t &max, const pmt::pmt_t &def,
                        const char* units_ = "",
                        const char* desc_ = "",
                        priv_lvl_t minpriv_ = RPC_PRIVLVL_MIN,
                        DisplayType display_ = DISPNULL)
  {
    d_min = min;
    d_max = max;
    d_def = def;
    d_units = units_;
    d_desc = desc_;
    d_minpriv = minpriv_;
    d_display = display_;
    d_object = obj;
#ifdef GR_RPCSERVER_ENABLED
    callbackregister_base::queryCallback_t
      inserter(new rpcbasic_inserter<T,Tfrom>(d_object, (Tfrom (T::*)())function),
               minpriv_, std::string(units_), display_, std::string(desc_), min, max, def);
    std::ostringstream oss(std::ostringstream::out);
    oss << name << "::" << functionbase;
    d_id = oss.str();
    //std::cerr << "REGISTERING GET CONST: " << d_id << "   " << desc_ << "   " << display_ << std::endl;
    rpcmanager::get()->i()->registerQueryCallback(d_id, inserter);
#endif
  }

  ~rpcbasic_register_get()
  {
#ifdef GR_RPCSERVER_ENABLED
    rpcmanager::get()->i()->unregisterQueryCallback(d_id);
#endif
  }

  pmt::pmt_t min() const { return d_min; }
  pmt::pmt_t max() const { return d_max; }
  pmt::pmt_t def() const { return d_def; }
  std::string units() const { return d_units; }
  std::string description() const { return d_desc; }
  priv_lvl_t privilege_level() const { return d_minpriv; }
  DisplayType default_display() const { return d_display; }

  void set_min(pmt::pmt_t p) { d_min = p; }
  void set_max(pmt::pmt_t p) { d_max = p; }
  void set_def(pmt::pmt_t p) { d_def = p; }
  void units(std::string u) { d_units = u; }
  void description(std::string d) { d_desc = d; }
  void privilege_level(priv_lvl_t p) { d_minpriv = p; }
  void default_display(DisplayType d) { d_display = d; }

private:
  std::string d_id;
  pmt::pmt_t d_min, d_max, d_def;
  std::string d_units, d_desc;
  priv_lvl_t d_minpriv;
  DisplayType d_display;
  T *d_object;
};



/*********************************************************************
 *   RPC Register Variable Classes
 ********************************************************************/

/*!
 * \brief Registers a read-only function to get a parameter over ControlPort.
 *
 * \details
 *
 * This class allows us to remotely get a value or parameter of the
 * block over ControlPort. Unlike the rpcbasic_register_get class,
 * this version is passed the variable directly and establishes a
 * getter for us, so there is no need to have a getter function
 * already in the object.
 *
 * This version is for read-only get access.
 *
 * We can set the (expected) minimum (\p min), maximum (\p max), and
 * default (\p def) of the variables we will get. These values are not
 * enforced, however, but can be useful for setting up graphs and
 * other ways of bounding the data.
 *
 * This class also allows us to provide information to the user about
 * the variable, such as an appropriate unit (\p units_) as well as a
 * description (\p desc_) about what the variable does.
 *
 * The privilege (\p minpriv_) level is the minimum privilege level a
 * remote must identify with to be able to call this function.
 *
 * We also provide display hints (\p display_), which can be used by
 * the ControlPort client application to know how to best display or
 * even print the data. This is a mask of options for variables set in
 * rpccallbackregister_base.h. The mask is defined by one of the
 * "DisplayType Plotting Types" and or'd with any of the "DisplayType
 * Options" features. See "Display Options" in \ref page_ctrlport for
 * details.
 */
template<typename Tfrom>
class rpcbasic_register_variable
  : public rpcbasic_base
{
protected:
  rpcbasic_register_get< rpcbasic_register_variable<Tfrom>, Tfrom > d_rpc_reg;
  Tfrom *d_variable;
  Tfrom get() { return *d_variable; }

public:

  void setptr(Tfrom* _variable)
  {
    rpcbasic_register_variable<Tfrom>::d_variable = _variable;
  }

  /*! Empty constructor which should never be called but needs to
   * exist for ues in varous STL data structures
   */
  rpcbasic_register_variable() :
    d_rpc_reg("FAIL", "FAIL", this, &rpcbasic_register_variable::get,
              pmt::PMT_NIL, pmt::PMT_NIL, pmt::PMT_NIL, DISPNULL,
              "FAIL", "FAIL", RPC_PRIVLVL_MIN),
    d_variable(NULL)
  {
    throw std::runtime_error("ERROR: rpcbasic_register_variable called with no args. If this happens, someone has tried to use rpcbasic_register_variable incorrectly.");
  };

  /*!
   * \brief Adds the ability to get the variable over ControlPort.
   *
   * \details
   *
   * Creates a new getter accessor function to read \p variable.
   *
   * \param namebase     Name of the object being set up for ControlPort access
   * \param functionbase The name of the function that we'll access over ControlPort
   * \param variable     A pointer to the variable, possibly as a member of a class
   * \param min          Expected minimum value the parameter can hold
   * \param max          Expected maximum value the parameter can hold
   * \param def          Expected default value the parameter can hold
   * \param units_       A string to describe what units to represent the variable with
   * \param desc_        A string to describing the variable.
   * \param minpriv_     The required minimum privilege level
   * \param display_     The display mask
   */
  rpcbasic_register_variable(const std::string& namebase,
                             const char* functionbase,
                             Tfrom *variable,
                             const pmt::pmt_t &min, const pmt::pmt_t &max, const pmt::pmt_t &def,
                             const char* units_ = "",
                             const char* desc_ = "",
                             priv_lvl_t minpriv_ = RPC_PRIVLVL_MIN,
                             DisplayType display_ = DISPNULL) :
    d_rpc_reg(namebase, functionbase, this, &rpcbasic_register_variable::get,
              min, max, def, units_, desc_, minpriv_, display_),
    d_variable(variable)
  {
    //std::cerr << "REGISTERING VAR: " << " " << desc_ << std::endl;
  }
};


/*!
 * \brief Registers a read/write function to get and set a parameter
 * over ControlPort.
 *
 * \details
 *
 * This class allows us to remotely get and/or set a value or
 * parameter of the block over ControlPort. Unlike the
 * rpcbasic_register_get class, this version is passed the variable
 * directly and establishes a getter for us, so there is no need to
 * have a getter function already in the object.
 *
 * This version establishes both get and set functions and so provides
 * read/write access to the variable.
 *
 * We can set the (expected) minimum (\p min), maximum (\p max), and
 * default (\p def) of the variables we will get. These values are not
 * enforced, however, but can be useful for setting up graphs and
 * other ways of bounding the data.
 *
 * This class also allows us to provide information to the user about
 * the variable, such as an appropriate unit (\p units_) as well as a
 * description (\p desc_) about what the variable does.
 *
 * The privilege (\p minpriv_) level is the minimum privilege level a
 * remote must identify with to be able to call this function.
 *
 * We also provide display hints (\p display_), which can be used by
 * the ControlPort client application to know how to best display or
 * even print the data. This is a mask of options for variables set in
 * rpccallbackregister_base.h. The mask is defined by one of the
 * "DisplayType Plotting Types" and or'd with any of the "DisplayType
 * Options" features. See "Display Options" in \ref page_ctrlport for
 * details.
 */
template<typename Tfrom>
class rpcbasic_register_variable_rw
  : public rpcbasic_register_variable<Tfrom>
{
private:
  rpcbasic_register_set< rpcbasic_register_variable_rw<Tfrom>, Tfrom > d_rpc_regset;

public:
  /*! Empty constructor which should never be called but needs to
   *  exist for ues in varous STL data structures.
   */
  rpcbasic_register_variable_rw()  :
    d_rpc_regset("FAIL", "FAIL", this,
                 &rpcbasic_register_variable<Tfrom>::get,
                 pmt::PMT_NIL, pmt::PMT_NIL, pmt::PMT_NIL,
                 DISPNULL, "FAIL", "FAIL", RPC_PRIVLVL_MIN)
  {
    throw std::runtime_error("ERROR: rpcbasic_register_variable_rw called with no args. if this happens someone used rpcbasic_register_variable_rw incorrectly.\n");
  };

  void set(Tfrom _variable)
  {
    *(rpcbasic_register_variable<Tfrom>::d_variable) = _variable;
  }

  /*!
   * \brief Adds the ability to set and get the variable over ControlPort.
   *
   * \details
   *
   * Creates new getter and setter accessor functions to read and write \p variable.
   *
   * \param namebase     Name of the object being set up for ControlPort access
   * \param functionbase The name of the function that we'll access over ControlPort
   * \param variable     A pointer to the variable, possibly as a member of a class
   * \param min          Expected minimum value the parameter can hold
   * \param max          Expected maximum value the parameter can hold
   * \param def          Expected default value the parameter can hold
   * \param units_       A string to describe what units to represent the variable with
   * \param desc_        A string to describing the variable.
   * \param minpriv      The required minimum privilege level
   * \param display_     The display mask
   */
  rpcbasic_register_variable_rw(
        const std::string& namebase,
        const char* functionbase,
        Tfrom *variable,
        const pmt::pmt_t &min, const pmt::pmt_t &max, const pmt::pmt_t &def,
        const char* units_ = "",
        const char* desc_ = "",
        priv_lvl_t minpriv = RPC_PRIVLVL_MIN,
        DisplayType display_=DISPNULL)
    : rpcbasic_register_variable<Tfrom>(namebase, functionbase, variable,
                                        min, max, def, units_, desc_),
      d_rpc_regset(namebase, functionbase, this,
                   &rpcbasic_register_variable_rw::set,
                   min, max, def, units_, desc_, minpriv, display_)
  {
    // no action
  }
};


/*!
 * \brief Registers a message handler function to post a message to a
 * block's handler.
 */
template<typename T>
class rpcbasic_register_handler : public rpcbasic_base
{
public:

  /*!
   * \brief Adds the ability to pass a message over ControlPort.
   *
   * \details
   * This makes any message handler function avialable over
   * ControlPort. Since message handlers always take in a single PMT
   * message input, this interface provides a very generic way of
   * setting values in a block in a flowgraph.
   *
   * \param block_alias  Alias of the block
   * \param handler      The name of the message port in the block
   * \param units_       A string to describe what units to represent the variable with
   * \param desc_        A string to describing the variable.
   * \param minpriv_     The required minimum privilege level
   * \param display_     The display mask
   */
  rpcbasic_register_handler(const std::string& block_alias,
                            const char* handler,
                            const char* units_ = "",
                            const char* desc_ = "",
                            priv_lvl_t minpriv_ = RPC_PRIVLVL_MIN,
                            DisplayType display_ = DISPNULL)
  {
    d_units = units_;
    d_desc = desc_;
    d_minpriv = minpriv_;
    d_display = display_;
    d_object = dynamic_cast<T*>(global_block_registry.block_lookup(pmt::intern(block_alias)).get());
#ifdef GR_RPCSERVER_ENABLED
    callbackregister_base::handlerCallback_t
      inserter(new rpcbasic_handler<T>(d_object, handler),
               minpriv_, std::string(units_), display_, std::string(desc_),
               0, 0, 0);
    std::ostringstream oss(std::ostringstream::out);
    oss << block_alias << "::" << handler;
    d_id = oss.str();
    //std::cerr << "REGISTERING GET: " << d_id << "  " << desc_ << std::endl;
    rpcmanager::get()->i()->registerHandlerCallback(d_id, inserter);
#endif
  }

  ~rpcbasic_register_handler()
  {
#ifdef GR_RPCSERVER_ENABLED
    rpcmanager::get()->i()->unregisterHandlerCallback(d_id);
#endif
  }

  std::string units() const { return d_units; }
  std::string description() const { return d_desc; }
  priv_lvl_t privilege_level() const { return d_minpriv; }
  DisplayType default_display() const { return d_display; }

  void units(std::string u) { d_units = u; }
  void description(std::string d) { d_desc = d; }
  void privilege_level(priv_lvl_t p) { d_minpriv = p; }
  void default_display(DisplayType d) { d_display = d; }

private:
  std::string d_id;
  std::string d_units, d_desc;
  priv_lvl_t d_minpriv;
  DisplayType d_display;
  T *d_object;
};



#endif