//somedefs.h

#include
#include

using namespace std;

union FreeList
{
union FreeList* next; // 指向下一个区块
char data; // 储存本块内存的首地址
};

int main()
{
FreeList* free_list[56] = {
nullptr,nullptr,nullptr,nullptr,nullptr,nullptr,nullptr,nullptr,
nullptr,nullptr,nullptr,nullptr,nullptr,nullptr,nullptr,nullptr,
nullptr,nullptr,nullptr,nullptr,nullptr,nullptr,nullptr,nullptr,
nullptr,nullptr,nullptr,nullptr,nullptr,nullptr,nullptr,nullptr,
nullptr,nullptr,nullptr,nullptr,nullptr,nullptr,nullptr,nullptr,
nullptr,nullptr,nullptr,nullptr,nullptr,nullptr,nullptr,nullptr,
nullptr,nullptr,nullptr,nullptr,nullptr,nullptr,nullptr,nullptr
};
FreeList *head = (FreeList *)malloc(sizeof(FreeList));
FreeList one = (FreeList )malloc(sizeof(FreeList));
one->data = 'A';
head->next = one;
free_list[0] = head;
FreeList my_free_list;
FreeList result;

//allocate
my_free_list = free_list[0];
result = my_free_list;
my_free_list = result->next;

//deallocate
head->next = my_free_list;
my_free_list = head;
char k = free_list[0]->next->data;
std::cout << k << std::endl;
}

这是仿写的你的allocate和deallocate操作链表，free_list确实变了啊，不太理解，能跟我说一下吗，谢谢你