Question

So.. How can we call something like
memcpy(dataCopy, data, length); to copy abstract data T?

Or if abstract T is not safe lets say we know that T is a POD (plain old data, basically a C struct) – is it possible to copy it?

Answer 1

Do you mean working for some arbitrary C++ type T? Unless you know that T is a POD (plain old data, basically a C struct) type, it is not safe to copy objects of type T with memcpy. That would prevent T‘s copy constructor from running, for example, which might lead to an incorrect copy (trying to memcpy an std::vector would not copy the data buffer, for example).