On Sun, Feb 10, 2008 at 12:19 AM, ChrisK
For Bimap is there anything like Data.Map.insertWithKey ?
No. I wanted to implement the insertWith family, but it wasn't clear to me what should happen if the value produced by the user's function already exists, bound to something else. One possibility might be to do nothing (or error) if that happens, making it the user's responsibility to not do such things. Whatever the case may be, it should be possible for client code to define such an operation, with no more than a constant-factor overhead. Perhaps I should wait and see if people find themselves doing this before guessing at an implementation. (Incidentally, almost everything in Map that's missing from Bimap is missing either because it doesn't make sense, or because of corner cases like this one.) Stuart