I don't think this is true. When it comes to copying bytes from a buffer supplied from the network, there isn't a wrapper/manager class that can do this for you. Somewhere down the pipeline some piece of code has to copy the unstructured, variable length byte stream into a manageable data structure. C++ does not give any way to do this beyond the mechanisms available in C.
What you can do is lower the surface area of vulnerability. Low level byte wrangling is kept in a small subset of generic classes and functions. Application logic then only uses the safe interfaces.
