#include <algorithm>
#include <iostream>
#include <vector>
 
using OBJ = int;
 
bool foo(const OBJ& a)
{ return a == 1; }
 
int main()
{
   std::vector< OBJ > vec = {1, 2, 3, 4};
   std::vector< bool > v;
   v.reserve(vec.size());
 
   std::for_each(vec.begin(), vec.end(), [&v](const OBJ& a)->void
      {
         v.insert(v.end(), foo(a) ); // bool return insert at back
      });
 
   for(auto const& it: v) std::cout << it << std::endl;
 
   return 0;
}
 

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