Re: [Boost-users] transform_iterator causing strange problems

Lindley M French wrote:

Okay, that makes sense as a cause, anyway. I'm not clear on how to fix it.

Well, given the cause is temporaries due to implicit conversions, just don't make those implicit conversions. just change const Group& operator()(const std::pair<GroupID, Group> &p) const to const Group& operator()(const std::pair<const GroupID, Group> &p) const Alternatively, you could write const Group& operator()(std::pair<const GroupID, Group> &p) const which allows you to make sure p is not a temporary.