C++11 adds to the language, but is there a strong consensus on what parts of pre-2011 C++ are not allowed in "Modern C++"? I have seen C++ code advertised as "modern" that still uses naked pointers, for example, while others claim that all pointers should be reference-counted. There is no agreed-upon algorithm that answers the question "is this source file written in valid Modern C++?", because there's no agreement on what that means.