include/barrett/systems/constant.h

/*
        Copyright 2009, 2010 Barrett Technology <support@barrett.com>

        This file is part of libbarrett.

        This version of libbarrett 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 of the
        License, or (at your option) any later version.

        This version of libbarrett 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 this version of libbarrett.  If not, see
        <http://www.gnu.org/licenses/>.

        Further, non-binding information about licensing is available at:
        <http://wiki.barrett.com/libbarrett/wiki/LicenseNotes>
*/

/*
 * constant.h
 *
 *  Created on: Sep 4, 2009
 *      Author: dc
 */

#ifndef BARRETT_SYSTEMS_CONSTANT_H_
#define BARRETT_SYSTEMS_CONSTANT_H_


#include <Eigen/Core>

#include <barrett/detail/ca_macro.h>
#include <barrett/math/traits.h>
#include <barrett/systems/abstract/system.h>
#include <barrett/systems/abstract/single_io.h>


namespace barrett {
namespace systems {

// TODO(dc): add a configuration file interface

template<typename T, bool RequiresAlignment = math::Traits<T>::RequiresAlignment>
class Constant : public System, public SingleOutput<T> {
public:
        explicit Constant(const T& value, const std::string& sysName = "Constant") :
                System(sysName), SingleOutput<T>(this), data(value)
        {
                this->outputValue->setData(&data);
        }
        virtual ~Constant() { mandatoryCleanUp(); }

protected:
        virtual void operate() {  /* do nothing */  }
        virtual void invalidateOutputs() { /* do nothing */ }

        T data;

private:
        DISALLOW_COPY_AND_ASSIGN(Constant);

public:
        EIGEN_MAKE_ALIGNED_OPERATOR_NEW_IF(RequiresAlignment)
};


}
}


#endif /* BARRETT_SYSTEMS_CONSTANT_H_ */