静态成员函数

#include <stdio.h>

class Test
{
private:
    static int cCount;
public:
    Test()
    {
        cCount++;
    }
    ~Test()
    {
        --cCount;
    }
    static int GetCount()
    {
        return cCount;
    }
};

int Test::cCount = 0;

int main()
{
    printf("count = %d\n", Test::GetCount());  // 0  这里直接利用了静态成员函数可以通过类名访问的属性
    
    Test t1;
    Test t2;
    
    printf("count = %d\n", t1.GetCount());    // 2
    printf("count = %d\n", t2.GetCount());    // 2
    
    Test* pt = new Test();
    
    printf("count = %d\n", pt->GetCount());   // 3
    
    delete pt;
    
    printf("count = %d\n", Test::GetCount()); // 2
    
    return 0;
}