[C++] empty/size

예제

• 코드

   #include <iostream>
   #include <list>
   #include <string>
   #include <vector>
      
   using namespace std;
      
   template <typename T> void func(const T &container) {
   	if (empty(container)) {
   		cout << "empty" << endl;
   		return;
   	}
      
   	cout << "size : " << size(container) << endl;
      
   	for (const auto &iter : container) {
   		cout << iter << " ";
   	}
   	cout << endl;
   }
      
   int main() {
   	vector<int> v{1, 2, 3};
   	func(v);
      
   	cout << "------ 1" << endl;
      
   	v.clear();
   	func(v);
      
   	cout << "------ 2" << endl;
      
   	list<string> l{"a", "b", "c"};
   	func(l);
      
   	return 0;
   }
  

• 실행 결과

   size : 3
   1 2 3
   ------ 1
   empty
   ------ 2
   size : 3
   a b c