Streamable.h

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/* 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_STREAMABLE
#define COM_DAFER45_TBTK_STREAMABLE
 
#include <string>
 
namespace TBTK{
 
class Streamable{
public:
    virtual std::string toString() const = 0;
 
    friend std::ostream& operator<<(
        std::ostream &stream,
        const Streamable &streamable
    );
};
 
inline std::ostream& operator<<(
    std::ostream &stream,
    const Streamable &streamable
){
    stream << streamable.toString();
 
    return stream;
}
 
}; //End of namespace TBTK
 
#endif