Re: [boost] [Review:Algorithms] all.hpp vs std::count

[STL]

C++11 requires list::size() to be O(1), unless I'm misreading it.

[Dave Abrahams]

Even if that's so, Marshall's library is probably operating on C++03 lists most of the time.

This is just an aside - it doesn't have anything to do with the proposed Algorithms library.

And how does the standard propose that we implement O(1) splice in this case?

Two-list partial-splice is now linear time. FDIS 23.3.5.5 [list.ops]/14: "Complexity: Constant time if &x == this; otherwise, linear time."

Don't forget in the real world most of us have to work with the old standard too ;-)

Of course, although I'm not sure how many implementations actually had O(N) list::size(). STL