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

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#pragma once

#include "export.h"
#include "types.hpp"

namespace hocon {

    /**
     * Implement this <em>in addition to</em> {@link config_includer} if you want to
     * support inclusion of files with the {@code include file("filename")} syntax.
     * If you do not implement this but do implement {@link config_includer},
     * attempts to load files will use the default includer.
     */
    class LIBCPP_HOCON_EXPORT config_includer_file {
    public:
        /**
         * Parses another item to be included. The returned object typically would
         * not have substitutions resolved. You can throw a config_exception here to
         * abort parsing, or return an empty object, but may not return null.
         *
         * @param context
         *            some info about the include context
         * @param what
         *            the include statement's argument (a file path)
         * @return a non-null config_object
         */
        virtual shared_object include_file(shared_include_context context, std::string what) const = 0;
    };

}  // namespace hocon