FilteringSetExample

#include <iostream>
#include <set>
#include <algorithm>

using namespace std;

int main(){
    set<int> a{1,2,3,4,5,6,7,8};
    /*
    remove_if(a.begin(),a.end(),[](int val){return val%2 == 0;});
     a.begin() - iterator to const node_type, then *a.begin() = 10 isn't valid, so
     remove_if can't be applied there;
    */
    set<int> filtered;
    copy_if(a.begin(),a.end(), inserter(filtered, filtered.end()),[](int val){return val%2 == 0;});
    for(const auto& v: filtered)
        cout << v << ' ';
    return 0;
}