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What's the best way in C++ to copy a pair from a map to vector? I'm doing this so I can subsequently sort the vector.
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Starting with C++17, we can use the std::map::merge member function to copy content from a map to another map. This is the recommended way to copy the contents of a map to an existing map in C++17 and above. That's all about copying entries of a map to another map in C++.
You just use its copy constructor or assignment operator: std::vector<std::vector<int> > vec; std::vector<std::vector<int> > copy_of_vec = vec; Yes, it's really that simple once you get rid of all the pointers.
vector<pair<K,V> > v(m.begin(), m.end());
or
vector<pair<K,V> > v(m.size());
copy(m.begin(), m.end(), v.begin());
copy() is in <algorithm>.
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