/*
	A C++ binding for comedilib.  Requires the Boost C++ libraries.
	Copyright (C) 2006-2007  Frank Mori Hess <fmhess@users.sourceforge.net>

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU Lesser General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program 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 Lesser General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#ifndef _COMEDILIB_WRAPPER_HPP
#define _COMEDILIB_WRAPPER_HPP

#include <boost/shared_ptr.hpp>
#include <comedilib.h>
#include <cstring>
#include <iostream>
#include <sstream>
#include <stdexcept>
#include <string>
#include <vector>

namespace comedi
{
	class subdevice;

	// wrapper for comedi_to_physical()
	class to_physical
	{
	public:
		to_physical()
		{
			memset(&_polynomial, 0, sizeof(_polynomial));
		}
		to_physical(const comedi_polynomial_t &polynomial):
			_polynomial(polynomial)
		{}
		double operator()(lsampl_t data) const
		{
			return comedi_to_physical(data, &_polynomial);
		}
	private:
		comedi_polynomial_t _polynomial;
	};

	// wrapper for comedi_from_physical()
	class from_physical
	{
	public:
		from_physical()
		{
			memset(&_polynomial, 0, sizeof(_polynomial));
		}
		from_physical(const comedi_polynomial_t &polynomial):
			_polynomial(polynomial)
		{}
		lsampl_t operator()(double physical_value) const
		{
			return comedi_from_physical(physical_value, &_polynomial);
		}
	private:
		comedi_polynomial_t _polynomial;
	};

	class device	{
	public:
		device() {}
		device(const std::string &device_file)
		{
			this->open(device_file);
		}
		std::string board_name() const
		{
			const char *name = comedi_get_board_name(comedi_handle());
			if(name == 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_board_name() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_board_name");
				throw std::runtime_error(message.str());
			}
			return name;
		}
		int command_test(comedi_cmd *cmd) const
		{
			int retval = comedi_command_test(comedi_handle(), cmd);
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_command_test() returned error.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_command_test");
				throw std::runtime_error(message.str());
			}
			return retval;
		}
		void command(comedi_cmd *cmd) const
		{
			int retval = comedi_command(comedi_handle(), cmd);
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_command() failed, return value=" << retval << " .";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_command");
				throw std::runtime_error(message.str());
			}
		}
		std::string default_calibration_path() const
		{
			char *c_string_file_path = comedi_get_default_calibration_path(comedi_handle());
			if(c_string_file_path == NULL)
			{
				comedi_perror("comedi_get_default_calibration_path");
				throw std::runtime_error(__PRETTY_FUNCTION__);
			}
			std::string file_path = c_string_file_path;
			free(c_string_file_path);
			return file_path;
		}
		void do_insn(comedi_insn *instruction) const
		{
			int retval = comedi_do_insn(comedi_handle(), instruction);
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_do_insn() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_do_insn");
				throw std::runtime_error(message.str());
			}
		}
		void do_insnlist(comedi_insnlist *insnlist) const
		{
			int retval = comedi_do_insnlist(comedi_handle(), insnlist);
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_do_insnlist() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_do_insnlist");
				throw std::runtime_error(message.str());
			}
		}
		std::string driver_name() const
		{
			const char *name = comedi_get_driver_name(comedi_handle());
			if(name == 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_driver_name() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_driver_name");
				throw std::runtime_error(message.str());
			}
			return name;
		}
		int fileno() const
		{
			int fd = comedi_fileno(comedi_handle());
			if(fd < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_fileno() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_fileno");
				throw std::runtime_error(message.str());
			}
			return fd;
		}
		subdevice find_subdevice_by_type(int type, const subdevice *start_subdevice = 0) const;
		subdevice get_read_subdevice() const;
		subdevice get_write_subdevice() const;
		unsigned n_subdevices() const
		{
			int retval = comedi_get_n_subdevices(comedi_handle());
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_n_subdevices() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_n_subdevices");
				throw std::runtime_error(message.str());
			}
			return retval;
		}
		void open(const std::string &device_file)
		{
			comedi_t *dev = comedi_open(device_file.c_str());
			if(dev == 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_open() failed, with device file name: \"" << device_file << "\".";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_open");
				throw std::runtime_error(message.str().c_str());
			}
			_comedi_handle.reset(dev, &comedi_close);
		}
	private:
		friend class subdevice;

		comedi_t* comedi_handle() const
		{
			if(_comedi_handle == 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": device not open.";
				std::cerr << message.str() << std::endl;
				throw std::invalid_argument(message.str());
			}
			return _comedi_handle.get();
		}

		boost::shared_ptr<comedi_t> _comedi_handle;
	};

	class calibration
	{
	public:
		calibration() {}
		calibration(const device &dev)
		{
			init(dev.default_calibration_path());
		}
		calibration(const std::string &file_path)
		{
			init(file_path);
		}
		const comedi_calibration_t* c_calibration() const
		{
			return _c_calibration.get();
		}
	private:
		void init(const std::string &file_path)
		{
			comedi_calibration_t *cal = comedi_parse_calibration_file(file_path.c_str());
			if(cal == NULL)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_parse_calibration_file() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_parse_calibration_file");
				throw std::runtime_error(message.str());
			}
			_c_calibration.reset(cal, &comedi_cleanup_calibration);
		}
		boost::shared_ptr<comedi_calibration_t> _c_calibration;
	};

	class subdevice
	{
	public:
		subdevice(): _index(-1)
		{}
		subdevice(const device &dev, unsigned subdevice_index):
			_device(dev), _index(subdevice_index)
		{
			if(_index >= _device.n_subdevices())
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": invalid subdevice index.";
				std::cerr << message.str() << std::endl;
				throw std::invalid_argument(message.str());
			}
		}
		void apply_hard_calibration(unsigned channel, unsigned range, unsigned aref, const calibration &cal)
		{
			if(cal.c_calibration() == 0) throw std::invalid_argument(__PRETTY_FUNCTION__);
			int retval = comedi_apply_parsed_calibration(comedi_handle(), index(),
				channel, range, aref, cal.c_calibration());
			if(retval < 0)
			{
				comedi_perror("comedi_apply_parsed_calibration");
				throw std::runtime_error(__PRETTY_FUNCTION__);
			}
		}
		void apply_hard_calibration(unsigned channel, unsigned range, unsigned aref)
		{
			apply_hard_calibration(channel, range, aref, calibration(dev()));
		}
		void arm(unsigned source) const
		{
			int retval = comedi_arm(comedi_handle(), index(), source);
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_arm() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_arm");
				throw std::runtime_error(message.str());
			}
		}
		void arm_channel(unsigned channel, unsigned source) const
		{
			int retval = comedi_arm_channel(comedi_handle(), index(), channel, source);
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_arm_channel() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_arm_channel");
				throw std::runtime_error(message.str());
			}
		}
		unsigned buffer_size() const
		{
			int retval = comedi_get_buffer_size(comedi_handle(), index());
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_buffer_size() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_buffer_size");
				throw std::runtime_error(message.str());
			}
			return retval;
		}
		void cancel() const
		{
			int retval = comedi_cancel(comedi_handle(), index());
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_cancel() failed, return value=" << retval << " .";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_cancel");
				throw std::runtime_error(message.str());
			}
		}
		lsampl_t data_read(unsigned channel, unsigned range, unsigned aref) const
		{
			lsampl_t value;
			int retval = comedi_data_read(comedi_handle(), index(), channel, range, aref, &value);
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_data_read() failed, return value=" << retval << " .";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_data_read");
				throw std::runtime_error(message.str());
			}
			return value;
		}
		std::vector<lsampl_t> data_read_n(unsigned channel, unsigned range, unsigned aref, unsigned num_samples) const
		{
			std::vector<lsampl_t> values(num_samples);
			int retval = comedi_data_read_n(comedi_handle(), index(), channel, range, aref, &values.at(0), values.size());
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_data_read_n() failed, return value=" << retval << " .";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_data_read_n");
				throw std::runtime_error(message.str());
			}
			return values;
		}
		lsampl_t data_read_delayed(unsigned channel, unsigned range, unsigned aref, unsigned nano_sec) const
		{
			lsampl_t value;
			int retval = comedi_data_read_delayed(comedi_handle(), index(), channel, range, aref, &value, nano_sec);
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_data_read_delayed() failed, return value=" << retval << " .";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_data_read_delayed");
				throw std::runtime_error(message.str());
			}
			return value;
		}
		void data_read_hint(unsigned channel, unsigned range, unsigned aref) const
		{
			int ret = comedi_data_read_hint(comedi_handle(), index(), channel, range, aref);
			if(ret < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_data_read_hint() failed, return value = " << ret << " .";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_data_read_hint");
				throw std::runtime_error(message.str());
			}
		}
		void data_write(unsigned channel, unsigned range, unsigned aref, lsampl_t data) const
		{
			int retval = comedi_data_write(comedi_handle(), index(), channel, range, aref, data);
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_data_write() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_data_write");
				throw std::runtime_error(message.str());
			}
		}
		device dev() const {return _device;}
		void digital_trigger_disable(unsigned trigger_id) const
		{
			int retval = comedi_digital_trigger_disable(comedi_handle(), index(), trigger_id);
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_digital_trigger_disable() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_digital_trigger_disable");
				throw std::runtime_error(message.str());
			}
		}
		void digital_trigger_enable_edges(unsigned trigger_id, unsigned base_input, unsigned rising_edge_inputs, unsigned falling_edge_inputs) const
		{
			int retval = comedi_digital_trigger_enable_edges(comedi_handle(), index(), trigger_id, base_input, rising_edge_inputs, falling_edge_inputs);
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_digital_trigger_enable_edges() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_digital_trigger_enable_edges");
				throw std::runtime_error(message.str());
			}
		}
		void digital_trigger_enable_levels(unsigned trigger_id, unsigned base_input, unsigned high_level_inputs, unsigned low_level_inputs) const
		{
			int retval = comedi_digital_trigger_enable_levels(comedi_handle(), index(), trigger_id, base_input, high_level_inputs, low_level_inputs);
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_digital_trigger_enable_levels() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_digital_trigger_enable_levels");
				throw std::runtime_error(message.str());
			}
		}
		void dio_bitfield(unsigned write_mask, unsigned *bits) const
		{
			dio_bitfield2(write_mask, bits, 0);
		}
		void dio_bitfield2(unsigned write_mask, unsigned *bits, unsigned base_channel) const
		{
			int retval = comedi_dio_bitfield2(comedi_handle(), index(),
				write_mask, bits, base_channel);
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_dio_bitfield2() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_dio_bitfield2");
				throw std::runtime_error(message.str());
			}
		}
		void dio_config(unsigned channel, enum comedi_io_direction direction) const
		{
			int retval = comedi_dio_config(comedi_handle(), index(), channel, direction);
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_dio_config() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_dio_config");
				throw std::runtime_error(message.str());
			}
		}
		enum comedi_io_direction dio_get_config(unsigned channel) const
		{
			unsigned dir;
			int retval = comedi_dio_get_config(comedi_handle(), index(), channel, &dir);
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_dio_get_config() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_dio_get_config");
				throw std::runtime_error(message.str());
			}
			return (enum comedi_io_direction)dir;
		}
		unsigned dio_read(unsigned channel) const
		{
			unsigned bit;
			int retval = comedi_dio_read(comedi_handle(), index(), channel, &bit);
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_dio_read() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_dio_read");
				throw std::runtime_error(message.str());
			}
			return bit;
		}
		void dio_write(unsigned channel, unsigned bit) const
		{
			int retval = comedi_dio_write(comedi_handle(), index(), channel, bit);
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_dio_read() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_dio_read");
				throw std::runtime_error(message.str());
			}
		}
		void disarm() const
		{
			int retval = comedi_disarm(comedi_handle(), index());
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_disarm() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_disarm");
				throw std::runtime_error(message.str());
			}
		}
		void disarm_channel(unsigned channel) const
		{
			int retval = comedi_disarm_channel(comedi_handle(), index(), channel);
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_disarm_channel() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_disarm_channel");
				throw std::runtime_error(message.str());
			}
		}
		unsigned find_range(unsigned channel, unsigned unit, double min, double max) const
		{
			int retval = comedi_find_range(comedi_handle(), index(), channel,
				unit, min, max);
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_find_range() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_find_range");
				throw std::runtime_error(message.str());
			}
			return retval;
		}
		unsigned flags() const
		{
			int retval = comedi_get_subdevice_flags(comedi_handle(), index());
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_subdevice_flags() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_subdevice_flags");
				throw std::runtime_error(message.str());
			}
			return retval;
		}
		unsigned get_buffer_contents() const
		{
			int retval = comedi_get_buffer_contents(comedi_handle(), index());
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_buffer_contents() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_buffer_contents");
				throw std::runtime_error(message.str());
			}
			return retval;
		}
		unsigned get_buffer_read_count() const
		{
			unsigned count;
			int retval = comedi_get_buffer_read_count(comedi_handle(), index(), &count);
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_buffer_read_count() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_buffer_read_count");
				throw std::runtime_error(message.str());
			}
			return count;
		}
		unsigned get_buffer_read_offset() const
		{
			int offset = comedi_get_buffer_read_offset(comedi_handle(), index());
			if (offset < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_buffer_read_offset() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_buffer_read_offset");
				throw std::runtime_error(message.str());
			}
			return offset;
		}
		unsigned get_buffer_write_count() const
		{
			unsigned count;
			int retval = comedi_get_buffer_write_count(comedi_handle(), index(), &count);
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_buffer_write_count() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_buffer_write_count");
				throw std::runtime_error(message.str());
			}
			return count;
		}
		unsigned get_buffer_write_offset() const
		{
			int offset = comedi_get_buffer_write_offset(comedi_handle(), index());
			if (offset < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_buffer_write_offset() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_buffer_write_offset");
				throw std::runtime_error(message.str());
			}
			return offset;
		}
		void get_clock_source(unsigned channel, unsigned *clock, unsigned *period_ns) const
		{
			int retval = comedi_get_clock_source(comedi_handle(), index(), channel, clock, period_ns);
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_clock_source() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_clock_source");
				throw std::runtime_error(message.str());
			}
		}
		void get_cmd_generic_timed(comedi_cmd *cmd, unsigned chanlist_len, unsigned scan_period) const
		{
			int retval = comedi_get_cmd_generic_timed(comedi_handle(), index(), cmd, chanlist_len, scan_period);
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_cmd_generic_timed() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_cmd_generic_timed");
				throw std::runtime_error(message.str());
			}
		}
		void get_cmd_src_mask(comedi_cmd *cmd) const
		{
			int retval = comedi_get_cmd_src_mask(comedi_handle(), index(), cmd);
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_cmd_src_mask() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_cmd_src_mask");
				throw std::runtime_error(message.str());
			}
		}
		void get_gate_source(unsigned channel, unsigned gate_index, unsigned *gate_source) const
		{
			int retval = comedi_get_gate_source(comedi_handle(), index(), channel, gate_index, gate_source);
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_gate_source() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_gate_source");
				throw std::runtime_error(message.str());
			}
		}
		unsigned get_routing(unsigned channel) const
		{
			unsigned routing = 0;
			int retval = comedi_get_routing(comedi_handle(), index(), channel, &routing);
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_routing() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_routing");
				throw std::runtime_error(message.str());
			}
			return routing;
		}
		comedi_polynomial_t hardcal_converter(unsigned channel, unsigned range,
			enum comedi_conversion_direction direction) const
		{
			comedi_polynomial_t result;
			int retval = comedi_get_hardcal_converter(comedi_handle(), index(),
				channel, range, direction, &result);
			if(retval < 0)
			{
				comedi_perror("comedi_get_hardcal_converter");
				throw std::runtime_error(__PRETTY_FUNCTION__);
			}
			return result;
		}
		unsigned hardware_buffer_size(enum comedi_io_direction direction) const
		{
			int retval = comedi_get_hardware_buffer_size(comedi_handle(), index(), direction);
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_hardware_buffer_size() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_hardware_buffer_size");
				throw std::runtime_error(message.str());
			}
			return retval;
		}
		unsigned index() const {return _index;};
		void internal_trigger(unsigned trig_num) const
		{
			int retval = comedi_internal_trigger(comedi_handle(), index(), trig_num);
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_internal_trigger() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_internal_trigger");
				throw std::runtime_error(message.str());
			}
		}
		void lock() const
		{
			int retval = comedi_lock(comedi_handle(), index());
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_lock() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_lock");
				throw std::runtime_error(message.str());
			}
		}
		unsigned mark_buffer_read(unsigned bytes) const
		{
			int marked = comedi_mark_buffer_read(comedi_handle(), index(), bytes);
			if (marked < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_mark_buffer_read() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_mark_buffer_read");
				throw std::runtime_error(message.str());
			}
			return marked;
		}
		unsigned mark_buffer_written(unsigned bytes) const
		{
			int marked = comedi_mark_buffer_written(comedi_handle(), index(), bytes);
			if (marked < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_mark_buffer_written() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_mark_buffer_written");
				throw std::runtime_error(message.str());
			}
			return marked;
		}
		unsigned max_buffer_size() const
		{
			int retval = comedi_get_max_buffer_size(comedi_handle(), index());
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_max_buffer_size() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_max_buffer_size");
				throw std::runtime_error(message.str());
			}
			return retval;
		}
		lsampl_t max_data(unsigned channel = 0) const
		{
			lsampl_t value = comedi_get_maxdata(comedi_handle(), index(), channel);
			if(value == 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_maxdata() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_maxdata");
				throw std::runtime_error(message.str());
			}
			return value;
		}
		bool max_data_is_chan_specific() const
		{
			int retval = comedi_maxdata_is_chan_specific(comedi_handle(), index());
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_maxdata_is_chan_specific() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_maxdata_is_chan_specific");
				throw std::runtime_error(message.str());
			}
			return retval != 0;
		}
		unsigned n_channels() const
		{
			int retval = comedi_get_n_channels(comedi_handle(), index());
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_n_channels() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_n_channels");
				throw std::runtime_error(message.str());
			}
			return retval;
		}
		unsigned n_ranges(unsigned channel = 0) const
		{
			int retval = comedi_get_n_ranges(comedi_handle(), index(), channel);
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_n_ranges() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_n_ranges");
				throw std::runtime_error(message.str());
			}
			return retval;
		}
		unsigned poll() const
		{
			int amount = comedi_poll(comedi_handle(), index());
			if (amount < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_poll() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_poll");
				throw std::runtime_error(message.str());
			}
			return amount;
		}
		const comedi_range* range(unsigned channel, unsigned range_index) const
		{
			comedi_range *cRange = comedi_get_range(comedi_handle(), index(), channel, range_index);
			if(cRange == 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_range() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_range");
				throw std::runtime_error(message.str());
			}
			return cRange;
		}
		bool range_is_chan_specific() const
		{
			int retval = comedi_range_is_chan_specific(comedi_handle(), index());
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_range_is_chan_specific() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_range_is_chan_specific");
				throw std::runtime_error(message.str());
			}
			return retval != 0;
		}
		void reset() const
		{
			int retval = comedi_reset(comedi_handle(), index());
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_reset() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_reset");
				throw std::runtime_error(message.str());
			}
		}
		void reset_channel(unsigned channel) const
		{
			int retval = comedi_reset_channel(comedi_handle(), index(), channel);
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_reset_channel() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_reset_channel");
				throw std::runtime_error(message.str());
			}
		}
		void set_as_read_subdevice() const
		{
			int retval = comedi_set_read_subdevice(comedi_handle(), index());
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_set_read_subdevice() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_set_read_subdevice");
				throw std::runtime_error(message.str());
			}
		}
		void set_as_write_subdevice() const
		{
			int retval = comedi_set_write_subdevice(comedi_handle(), index());
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_set_write_subdevice() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_set_write_subdevice");
				throw std::runtime_error(message.str());
			}
		}
		void set_buffer_size(unsigned num_bytes) const
		{
			int retval = comedi_set_buffer_size(comedi_handle(), index(), num_bytes);
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_set_buffer_size() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_set_buffer_size");
				throw std::runtime_error(message.str());
			}
		}
		void set_clock_source(unsigned channel, unsigned clock, unsigned period_ns) const
		{
			int retval = comedi_set_clock_source(comedi_handle(), index(), channel, clock, period_ns);
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_set_clock_source() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_set_clock_source");
				throw std::runtime_error(message.str());
			}
		}
		void set_counter_mode(unsigned channel, unsigned mode_bits) const
		{
			int retval = comedi_set_counter_mode(comedi_handle(), index(), channel, mode_bits);
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_set_counter_mode() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_set_counter_mode");
				throw std::runtime_error(message.str());
			}
		}
		void set_filter(unsigned channel, unsigned filter) const
		{
			int retval = comedi_set_filter(comedi_handle(), index(), channel, filter);
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_set_filter() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_set_filter");
				throw std::runtime_error(message.str());
			}
		}
		void set_gate_source(unsigned channel, unsigned gate_index, unsigned gate_source) const
		{
			int retval = comedi_set_gate_source(comedi_handle(), index(), channel, gate_index, gate_source);
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_set_gate_source() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_set_gate_source");
				throw std::runtime_error(message.str());
			}
		}
		void set_max_buffer_size(unsigned num_bytes) const
		{
			int retval = comedi_set_max_buffer_size(comedi_handle(), index(), num_bytes);
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_set_max_buffer_size() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_set_max_buffer_size");
				throw std::runtime_error(message.str());
			}
		}
		void set_other_source(unsigned channel, unsigned other, unsigned source) const
		{
			int retval = comedi_set_other_source(comedi_handle(), index(), channel, other, source);
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_set_other_source() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_set_other_source");
				throw std::runtime_error(message.str());
			}
		}
		void set_routing(unsigned channel, unsigned routing) const
		{
			int retval = comedi_set_routing(comedi_handle(), index(), channel, routing);
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_set_routing() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_set_routing");
				throw std::runtime_error(message.str());
			}
		}
		comedi_polynomial_t softcal_converter(unsigned channel, unsigned range,
			enum comedi_conversion_direction direction, const calibration &cal) const
		{
			if(cal.c_calibration() == 0) throw std::invalid_argument(__PRETTY_FUNCTION__);
			comedi_polynomial_t result;
			int retval = comedi_get_softcal_converter(index(),
				channel, range, direction, cal.c_calibration(), &result);
			if(retval < 0)
			{
				comedi_perror("comedi_get_softcal_converter");
				throw std::runtime_error(__PRETTY_FUNCTION__);
			}
			return result;
		}
		comedi_subdevice_type subdevice_type() const
		{
			int retval = comedi_get_subdevice_type(comedi_handle(), index());
			if(retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_get_subdevice_type() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_get_subdevice_type");
				throw std::runtime_error(message.str());
			}
			return comedi_subdevice_type(retval);
		}
		void unlock() const
		{
			int retval = comedi_unlock(comedi_handle(), index());
			if (retval < 0)
			{
				std::ostringstream message;
				message << __PRETTY_FUNCTION__ << ": comedi_unlock() failed.";
				std::cerr << message.str() << std::endl;
				comedi_perror("comedi_unlock");
				throw std::runtime_error(message.str());
			}
		}
	private:
		comedi_t* comedi_handle() const {return dev().comedi_handle();}

		device _device;
		unsigned _index;
	};

	inline subdevice device::find_subdevice_by_type(int type, const subdevice *start_subdevice) const
	{
		unsigned start_index;
		if(start_subdevice) start_index = start_subdevice->index() + 1;
		else start_index = 0;
		int subdev = comedi_find_subdevice_by_type(comedi_handle(), type, start_index);
		if(subdev < 0)
		{
			std::ostringstream message;
			message << __PRETTY_FUNCTION__ << ": failed to find subdevice of type " << type << " .";
			std::cerr << message.str() << std::endl;
			comedi_perror("comedi_find_subdevice_by_type");
			throw std::runtime_error(message.str());
		}
		return subdevice(*this, subdev);
	}

	inline subdevice device::get_read_subdevice() const
	{
		int subdev = comedi_get_read_subdevice(comedi_handle());
		if (subdev < 0)
		{
			std::ostringstream message;
			message << __PRETTY_FUNCTION__ << ": comedi_get_read_subdevice() failed.";
			std::cerr << message.str() << std::endl;
			comedi_perror("comedi_get_read_subdevice");
			throw std::runtime_error(message.str());
		}
		return subdevice(*this, subdev);
	}

	inline subdevice device::get_write_subdevice() const
	{
		int subdev = comedi_get_write_subdevice(comedi_handle());
		if (subdev < 0)
		{
			std::ostringstream message;
			message << __PRETTY_FUNCTION__ << ": comedi_get_write_subdevice() failed.";
			std::cerr << message.str() << std::endl;
			comedi_perror("comedi_get_write_subdevice");
			throw std::runtime_error(message.str());
		}
		return subdevice(*this, subdev);
	}
};

#endif	// _COMEDILIB_WRAPPER_HPP