Tracking issue: Provide Entry-like API for Option

[shahn]

Often I have code where Option is used to indicate whether a value has been initialized or not. In these instances I often have code that either wants to use the value directly or initialize it and then use the value. So what I'm looking for is similar to as_ref()/as_mut() except they should return &T/&mut T respectively, and take either a value or a closure.

I think I would call the functions get{,_mut}_or_insert{,with}() marrying the get functions (for example in hashmaps) for getting references with the or_insert Entry like functions.

[Thinkofname]

Isn't this just as_ref/mut().unwrap_or(val) and as_ref/mut().unwrap_or_else(|| val) ?

Edit: These don't modify the original Option which I guess it what you wanted

[shahn]

indeed

[tbu-]

See also #25149 and #29203. Also, this seems fixed by #39289.

[shahn]

AIUI, this is not fixed by #39289, because this issue is referenced as the tracking issue for the implementation and should stay open until it's decided whether this is to be stabilized or backed out.

[tbu-]

Ah, right. Maybe you could put "Tracking issue" in the title.