lib/nodehandle.cpp

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 <iostream>
#include <string>
#include <map>

int main()
{
  std::map<int, std::string> m{{1, "mango"},
                               {2, "papaya"},
                               {3, "guava"}};

  auto nh = m.extract(2);  // nh has type decltype(m)::node_type
  nh.key() = 4;
  m.insert(std::move(nh));

  for (const auto& [key, value] : m) {
    std::cout << key << ": " << value << '\n';
  }
}