ios_base::register_callback()

This website contains some doc on this topic:

http://www.cplusplus.com/reference/ios/ios_base/register_callback/?kw=register_callback

Does anyone else have information or links to docs on this function or examples of usage?

Thanks.
the other reference site has more (with a practical example)
http://en.cppreference.com/w/cpp/io/ios_base/register_callback
Sorry, I had searched, but I don't know how I missed this page; usually www.cppreference.com shows up on searches.

Thanks for the input.
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