利用类内的函数释放类本身动态分配的内存

#include
using namespace std;

struct _A;
struct _B;
typedef void (*dealloc)(struct _A *a);
typedef struct _A {
 int i;
 dealloc b;
}A;

void free_used_b(struct _A *a)
{
 delete a;
}

int main()
{
 cout<<"hello,world"<  
 for (size_t i=0; i < 100000000; i++)
 {
  A *a= new A;
  a->i = 5;
  a->b=free_used_b;
  cout<i<  
  a->b(a);
 }
 
 return 0;
}

 

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

示例2

#include
using namespace std;

struct _B;

typedef struct _A {
 int i;
 dealloc b;
 void free_self(struct _A *a)
 {
  delete a;
 }
}A;

int main()
{
 cout<<"hello,world"<  
 for (size_t i=0; i < 100000000; i++)
 {
  A *a= new A;
  a->i = 5;
  cout<i<  
  a->free_self(a);
 }
 
 return 0;
}