[C++] extract

개요

• 컨테이너에서 노드를 추출

예제

• 코드

   #include <iostream>
   #include <map>
   #include <string>
      
   using namespace std;
      
   int main() {
   	map<int, string> m{{1, "a"}, {2, "b"}, {3, "c"}};
      
   	auto node = m.extract(3);
      
   	for (const auto &iter : m) {
   		cout << iter.first << ", " << iter.second << endl;
   	}
      
   	cout << "------ 1" << endl;
      
   	cout << node.key() << endl;
      
   	cout << "------ 2" << endl;
      
   	node.key() = 5;
      
   	m.insert(move(node));
      
   	for (const auto &iter : m) {
   		cout << iter.first << ", " << iter.second << endl;
   	}
      
   	return 0;
   }
  

• 실행 결과

   1, a
   2, b
   ------ 1
   3
   ------ 2
   1, a
   2, b
   5, c