example11.cpp

来自「Advanced Internet Programming Lecture 2 」· C++ 代码 · 共 38 行

#include <iostream>
using namespace std;

class Counter {
public:
  static int count;
  Counter() { count++; }
  ~Counter() { count--; }
};
int Counter::count;

void f();

int main(void)
{
  Counter o1;
  cout << "Objects in existence: ";
  cout << Counter::count << "\n";

  Counter o2;
  cout << "Objects in existence: ";
  cout << Counter::count << "\n";

  f();
  cout << "Objects in existence: ";
  cout << Counter::count << "\n";

  return 0;
}
void f()
{
  Counter temp;
  cout << "Objects in existence: ";
  cout << Counter::count << "\n";
  // temp is destroyed when f() returns
}