Joaquin M Lopez Munoz wrote:
There's no particular provision for swapping keys. You could do something like:
blah.modify_key(blah.find(foo1), _1 = unused_value); blah.modify_key(blah.find(foo2), _1 = foo1); blah.modify_key(blah.find(unused_value), _1 = foo2);
Well, i did something like this (in my case unused_value is INT_MIN). But i really dont find that a clean solution. I think the container must not assume that i always have something like an "unused" value in the particular domain, it seems easy for int, but that might not be true for other types.
Providing a general key_swap facility is not as simple as it might seem
Thats what I expected. Not simple, but don't you think thats possible, do you? I think we need a swap() for values too, because a value might be used as a uniq key in another index. IMHO such a swap method is valuable. --David