Why can't I wrap a T* in an std::vector?

Question

I have a T* addressing a buffer with len elements of type T. I need this data in the form of an std::vector, for

Answer 1

These days - you no longer need to wrap a T* in an std::vector, you can wrap it with an std::span (in C++20; before that - use gsl::span). A span offers you all the convenience of a standard library container - in fact, basically all relevant features of std::vector excluding changes to the size - with a very thin wrapper class. That's what you want to use, really.

For more on spans, read: What is a "span" and when should I use one?