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/usr/include/hocon/parser/config_node.hpp is in libcpp-hocon-dev 0.1.6-1.

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#pragma once

#include <string>
#include "../export.h"

namespace hocon {
    /**
     * A node in the syntax tree for a HOCON or JSON document.
     *
     * <p>
     * Because this object is immutable, it is safe to use from multiple threads and
     * there's no need for "defensive copies."
     *
     * <p>
     * <em>Do not implement interface {@code ConfigNode}</em>; it should only be
     * implemented by the config library. Arbitrary implementations will not work
     * because the library internals assume a specific concrete implementation.
     * Also, this interface is likely to grow new methods over time, so third-party
     * implementations will break.
     */
    class LIBCPP_HOCON_EXPORT config_node {
    public:
        /**
         * The original text of the input which was used to form this particular
         * node.
         *
         * @return the original text used to form this node as a String
         */
        virtual std::string render() const = 0;
    };

}  // namespace hocon