Can I make the data of an entire C++ class be std::atomic<>

Question

I havea class, used for data storage, of which there is only a single instance.

The caller is message driven and has become too large and is a prime candidate for refactoring, such that each message is handled by a separate thread. However, these could then compete to read/write the data.

If I were using mutexes (mutices?), I would only use them on write operations. I don't think that matters here, as the data are atomic, not the functions which access the data.

Is there any easy way to make all of the data atomic? Currently it consists of simple types, vectors and objects of other classes. If I have to add std::atomic<> to every sub-field, I may as well use mutexes.