How to detect the presence of old iostreams

[Gennaro Prota]

Hi everybody,
a simple but very important question for the boost library:

Which versions of libstdc++ had old iostreams only? What is the correct
way to test if we cannot use the standard ones? We are looking for a
conditional compilation test like:

#if defined (__GLIBCPP__) && !defined (_GLIBCPP_DEPRECATED)

but the above is just to give an idea.
What's the correct test?


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