Ctrl-o with ignore "No write since last change"

Question

I can press ctrlO to go to the last jump point. However, if there are any changes in the current document it warns me with:

E37: No write since last change (add ! to override)

Is there a way to ignore that message and do ctrl-o and either (1) discard any changes; or (2) save any changes and do ctrl-o?

Answer 1

1. Discard any changes --- No.

2. Save any changes --- set autowrite or set autowriteall

3. Hide buffer but keep it in memory (can ask for saving it later) --- set hidden

4. Ask if you want to save a buffer --- set confirm

Note: (2), (3) and (4) are global options and change Vim behaviour for many(!) commands.