Local Classes: A class may be defined within a function : class definition « Class « C++ Tutorial

1. C++ Tutorial
2. Class
3. class definition

#include <iostream>
using namespace std;
   
void f();
   
int main()
{
  f();
  return 0;
}
   
void f()
{
  class myclass {
    int i;
  public:
    void put_i(int n) { i=n; }
    int get_i() { return i; }
  } ob;
   
  ob.put_i(10);
  cout << ob.get_i();
}