I guess this is a simple question. I need to do something like this:
std::set<int> s1, s2; s1 = getAnExcitingSet(); std::transform(s1.begin(), s1.end(), std::back_inserter(s2), ExcitingUnaryFunctor());
std::back_inserter doesn’t work since there’s no
std::inserter also needs an iterator? I haven’t used
std::inserter so I’m not sure what to do.
Does anyone have an idea?
Of course, my other option is to use a vector for
s2, and then just sort it later. Maybe that’s better?
set doesn’t have
push_back because the position of an element is determined by the comparator of the set. Use
std::inserter and pass it
std::set<int> s1, s2; s1 = getAnExcitingSet(); transform(s1.begin(), s1.end(), std::inserter(s2, s2.begin()), ExcitingUnaryFunctor());
The insert iterator will then call
s2.insert(s2.begin(), x) where
x is the value passed to the iterator when written to it. The set uses the iterator as a hint where to insert. You could as-well use