[int_19h]

I don't think it's entirely accurate. "Modern idiomatic C++" was a thing already before C++11 - that would be the kind of code that heavily used the standard library and especially STL containers, iterators etc (but also stuff like auto_ptr etc; and yes, for all its flaws, it was actually used).

And don't forget that C++03 TR1 also added a bunch of very useful stuff - most notably, std::shared_ptr and std::function. And, of course, Boost has been a thing long before C++11, filling many gaps for "modern C++" projects of the time.

"classic C++" from that perspective is C++ written more or less Java-style.