what docs and examples would those be? are you working with v2.4 docs? you really must not do that. if it’s not v2.4 docs you’re talking about, I would very much like to know very specifically what you’re referring to. links at least, or citations. not a rhetorical question.
current docs on that class have pretty much one (static) method and it is create (others inherited/overridden from superclasses) and even the docs for v3.0.0 have it. even v2.4 docs show use of cv::Ptr in most places.
OpenCV: cv::SimpleBlobDetector Class Reference