Constant.h

/* Copyright 2019 Kristofer Björnson
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
 
#ifndef COM_DAFER45_TBTK_QUANTITY_CONSTANT
#define COM_DAFER45_TBTK_QUANTITY_CONSTANT
 
#include "TBTK/Quantity/Base.h"
#include "TBTK/Quantity/Derived.h"
#include "TBTK/TBTK.h"
 
#include <cmath>
#include <map>
#include <string>
 
namespace TBTK{
namespace Quantity{
 
class Constant{
public:
    Constant(){};
 
    template<typename Quantity>
    explicit Constant(double value, Quantity);
 
    template<typename Quantity>
    int getExponent() const;
 
    operator double(){
        return value;
    };
private:
    double value;
    std::vector<int> exponents;
};
 
template<typename Quantity>
Constant::Constant(
    double value,
    Quantity
) :
    value(value),
    exponents(7)
{
    exponents[0] = static_cast<int>(Quantity::Exponent::Angle);
    exponents[1] = static_cast<int>(Quantity::Exponent::Charge);
    exponents[2] = static_cast<int>(Quantity::Exponent::Count);
    exponents[3] = static_cast<int>(Quantity::Exponent::Energy);
    exponents[4] = static_cast<int>(Quantity::Exponent::Length);
    exponents[5] = static_cast<int>(Quantity::Exponent::Temperature);
    exponents[6] = static_cast<int>(Quantity::Exponent::Time);
}
 
template<>
inline int Constant::getExponent<Angle>() const{
    return exponents[0];
}
 
template<>
inline int Constant::getExponent<Charge>() const{
    return exponents[1];
}
 
template<>
inline int Constant::getExponent<Count>() const{
    return exponents[2];
}
 
template<>
inline int Constant::getExponent<Energy>() const{
    return exponents[3];
}
 
template<>
inline int Constant::getExponent<Length>() const{
    return exponents[4];
}
 
template<>
inline int Constant::getExponent<Temperature>() const{
    return exponents[5];
}
 
template<>
inline int Constant::getExponent<Time>() const{
    return exponents[6];
}
 
}; //End of namesapce Quantity
}; //End of namesapce TBTK
 
#endif