这段代码会内存泄露吗？

2013-05-03 02:52:56 227 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

单例模式（饿汉式线程安全无内存泄露） // Singleton.cpp : 定义控制台应用程序的入口点。 //通过嵌套类实现析构 #include "stdafx.h" #include &lt;iostream&gt; using namespace std; class Singleton{ private: Singleton(){} //将构造函数定义为私有的，避免直接创建外部对象。 ~Singl... 阅读详情



#include <stdio.h>

#include <stdlib.h>





struct mblock

{

struct mblock *next; // 指向堆中下一个内存块的指针.

char *start; //内存块起始.

char *end; //内存块结束.

char *avail; //可用内存块.

};



typedef struct heap

{

struct mblock head; // 内存块的头.

struct mblock *last; // 内存块的尾.

}*Heap;



static struct mblock *free_blocks;

struct heap string_heap;



#define MBLOCK_SIZE (4 * 1024)

// 字节对齐.

#define ALIGN_SIZE 8

#define ALIGN(size, align) ((size + align - 1) & (~(align - 1)))



void init_heap(Heap hp);







void init_heap(Heap hp)

{

hp->head.next = NULL;

hp->head.start = hp->head.end = hp->head.avail;

hp->last = &hp->head;

}





void *heap_allocate(Heap hp, int size)

{

struct mblock *blk = NULL;

// 字节对齐.

size = ALIGN(size, ALIGN_SIZE);

blk = hp->last;

// 申请的大小 > 尾巴 - 可用的空间.

puts("-------------------");

while (size > blk->end - blk->avail)

{

puts("fjdffk");

if ((blk->next = free_blocks) != NULL)

{

printf("exit...");

}

else

{

puts("-------------------333");

int m = size + MBLOCK_SIZE + sizeof(struct mblock);

blk->next = (struct mblock*)malloc(m);

blk = blk->next;

if (blk == NULL)

{

}

blk->end = (char*)blk + m;

}

blk->avail = blk->start = (char*)(blk + 1);

blk->next = NULL;

hp->last = blk;

puts("-------------------4444");

}

puts("-------------------222");

blk->avail += size;

return blk->avail - size;

}



void free_heap(Heap hp)

{

hp->last->next = free_blocks;

free_blocks = hp->head.next;

init_heap(hp);

}



int main(int argc, char *argv[])

{

init_heap(&string_heap);

struct x

{

int x1;

int y1;

int a;

int b;

};

struct x *p = heap_allocate(&string_heap, 100);



p->x1 = 3;

p->y1 = 4;

printf("%d\n", p->x1);

free_heap(&string_heap);

return 0;

}