Can __gnu_cxx::stdio_filebuf<char_type,traits_type>'s is_open method() throws exception??

[unlvsur unlvsur]

I am curious about this

https://github.com/expnkx/fast_io/blob/73aad34734a8e8891c81a418ab1351fe994eae4e/include/fast_io_legacy_impl/cpp/filebuf_file.h#L57

Or what about close() method? Will they throw EH??

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