Question

I have a set of objects that, during some initializations, I need to keep in an std::map, but after initialization I only need an std::vector. What efficient way is there to save the map’s values into a vector?

I’m looking either for something with move semantics, or maybe there’s some implementation of a map in Boost that would make this easier.

Answer 1

Shouldn’t this do the job:

your_vector.reserve(your_map.size());
for(auto& item : your_map) {
    your_vector.push_back(std::move(item.second));
}