The following code example is taken from the book
 
  C++17 - The Complete Guide
 by Nicolai M. Josuttis,
 Leanpub, 2017 
 
 The code is licensed under a
 
     Creative Commons Attribution 4.0 International License.
      
 
 
// raw code
 
#include "pmrcustomer.hpp" 
#include "tracker.hpp" 
#include <vector> 
 
int main() 
{ 
  Tracker tracker; 
  std::pmr::vector<PmrCustomer> coll(&tracker); 
  coll.reserve(100);                     // allocates with tracker   
 
  PmrCustomer c1{"Peter, Paul & Mary"};  // allocates with get_default_resource()  
  coll.push_back(c1);                    // allocates with vector allocator (tracker)  
  coll.push_back(std::move(c1));         // copies (allocators not interchangeable)  
 
  for (const auto& cust : coll) { 
    std::cout << cust.getName() << '\n'; 
  } 
}