It seems like you’re looking for a transition guide to C++ version 5.4, but C++ versions aren’t typically numbered in that way. C++ versions are usually denoted by the year of their release (e.g., C++98, C++11, C++14, C++17, C++20, and the upcoming C++23). If you’re referring to a compiler (such as GCC 5.4) or a specific framework or library version, I can help with that as well.