There's no such thing as an agreement. Perhaps on the learning resources, but not about which features should be used, which I think it is a better interpretation of the parent's comment.

Take the C++ that's used on Chrome and compare to a Qt application. They'll be very different, and some features will be outright forbidden, depending on the codebase (for instance, Qt doesn't use copy constructors, or exceptions, and uses its own smart pointer classes). Not even templates, if you are using QObjects.

I know of noone that uses features such as RTTI.