Constants.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_CONSTANTS
#define COM_DAFER45_TBTK_QUANTITY_CONSTANTS

#include "TBTK/Quantity/Base.h"
#include "TBTK/Quantity/Constant.h"
#include "TBTK/Quantity/Derived.h"
#include "TBTK/TBTK.h"
#include "TBTK/UnitHandler.h"

#include <cmath>
#include <map>
#include <string>

namespace TBTK{
namespace Quantity{

class Constants{
public:
    static Constant get(const std::string &name);
private:
    static std::map<std::string, Constant> constants;

    static void initialize();

    friend void TBTK::Initialize();
};

inline Constant Constants::get(const std::string &name){
    try{
        return constants.at(name);
    }
    catch(const std::out_of_range &e){
        TBTKExit(
            "Constants::get()",
            "Unknown constant '" << name << "'.",
            ""
        );
    }
}

}; //End of namesapce Quantity
}; //End of namesapce TBTK

#endif