Switch Git branch without files checkout

Question

Is it possible in Git to switch to another branch without checking out all files?

After switching branch I need to delete all files, regenerate them, commit and swit

Answer 1

say you want to be in branch A, but with the files from branch B

find the current commit ref of branch A with git log, e.g. "99ce9a2",

git checkout A
git reset --hard B
git reset 99ce9a2

you should now be on branch A, with a folder structure corresponding to B, which show up as unstaged changes (A history has not changed).