Printable.h

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/*
 * This file is part of KnowRob, please consult
 * https://github.com/knowrob/knowrob for license details.
 */
 
#ifndef KNOWROB_PRINTABLE_H
#define KNOWROB_PRINTABLE_H
 
#include <ostream>
#include <sstream>
#include <fmt/format.h>
 
namespace knowrob {
 
    class Printable {
    public:
        virtual ~Printable() = default;
 
        virtual void write(std::ostream &os) const = 0;
 
        virtual std::string format() const {
            std::stringstream ss;
            write(ss);
            return ss.str();
        }
    };
 
    inline std::ostream &operator<<(std::ostream &os, const Printable &printable) {
        printable.write(os);
        return os;
    }
}
 
//#if FMT_VERSION >= 90000
//template <> struct fmt::formatter<knowrob::Printable> : fmt::ostream_formatter {};
//#endif
 
#endif //KNOWROB_PRINTABLE_H