ConstantFunction.h

/**
 * \author Norihiro Watanabe
 * \date   2013-08-13
 *
 * \copyright
 * Copyright (c) 2012-2016, OpenGeoSys Community (http://www.opengeosys.org)
 *            Distributed under a Modified BSD License.
 *              See accompanying file LICENSE.txt or
 *              http://www.opengeosys.org/project/license
 *
 */

#ifndef MATHLIB_CONSTANTFUNCTION_H_
#define MATHLIB_CONSTANTFUNCTION_H_

#include <array>
#include <numeric>

namespace MathLib
{

/**
 * A constant function.
 * \f[
 * 	f(x_1,...,x_k)=a_0
 * \f]
 */
template <typename T_TYPE>
class ConstantFunction
{
public:
	explicit ConstantFunction(T_TYPE const& value)
	: _value(value)
	{}

	T_TYPE operator()() const
	{
		return _value;
	}
private:
	T_TYPE const _value;
};

}

#endif  // MATHLIB_CONSTANTFUNCTION_H_