释放结构 [英] freeing structure

问题描述

如果我有以下结构并执行以下程序，那么

我在结束时是否正确释放了所有已分配的结构内存？


typedef struct {

双重名称;


double * point2sumthing1;

double * point2sumthing2;


} obj_t;


obj_t * obj1 =（obj_t *）malloc（sizeof（obj_t））;


obj1-> ; point2sumthing1 =（double *）malloc（5 * sizeof（double））;

obj2-> point2sumthing2 =（double *）malloc（10 * sizeof（double））;


....（做一些事情）


....

免费（obj1）;

我关心的是两个双指针。我不确定free（）

是否将它们视为结构的一部分

谢谢

解决方案

wanwan写道：

如果我有以下结构并执行以下程序，将
我正确释放所有分配的内存最后的结构是什么？

typedef struct {
双名;

double * point2sumthing1;
double * point2sumthing2;

} obj_t;

obj_t * obj1 =（obj_t *）malloc（sizeof（obj_t））;

obj1-> point2sumthing1 =（double *）malloc（ 5 * sizeof（double））;
obj2-> point2sumthing2 =（double *）malloc（10 * sizeof（double））;

...（做一些东西）

...
免费（obj1）;

我关心的是两个双指针。我不确定free（）
是否将它们视为结构的一部分
这种方法不起作用。

你必须单独释放双指针。

喜欢，

免费（obj1-> point2sumthing1）;

免费（obj1-> point2sumthing2）;

免费（obj1 ）

否则会有内存泄漏


谢谢

"弯弯" < ER ******* @ yahoo.com>写道：


[三个malloc（）s，一个free（）]

如果我有以下结构并执行以下程序，将
我在结束时正确释放了所有分配的结构内存？

编号一般来说，malloc（）和free（）应该配对。如果从malloc（）获得

a指针，那么你需要自己释放（）它。

-

Ben Pfaff
电子邮件： bl*@cs.stanford.edu

web： http://benpfaff.org

thx进行回复。


如果我在指向NULL时自由（obj1-> point2sumthing1）怎么样？

它会给我一个运行时错误吗？

if I have the following structure and do the following procedure, will
I properly free up all allocated memory of the struture at the end?

typedef struct {
double name;

double *point2sumthing1;
double *point2sumthing2;

} obj_t;

obj_t *obj1 = (obj_t*)malloc(sizeof(obj_t));

obj1->point2sumthing1 = (double*)malloc(5*sizeof(double));
obj2->point2sumthing2 = (double*)malloc(10*sizeof(double));

....(do some stuff)

....
free(obj1);
My concern is the two double pointers. I am not certain whether free()
treats them as part of the structure
Thanks

解决方案

wanwan wrote:

if I have the following structure and do the following procedure, will
I properly free up all allocated memory of the struture at the end?

typedef struct {
double name;

double *point2sumthing1;
double *point2sumthing2;

} obj_t;

obj_t *obj1 = (obj_t*)malloc(sizeof(obj_t));

obj1->point2sumthing1 = (double*)malloc(5*sizeof(double));
obj2->point2sumthing2 = (double*)malloc(10*sizeof(double));

...(do some stuff)

...
free(obj1);
My concern is the two double pointers. I am not certain whether free()
treats them as part of the structure This approach doesnt work.
You have to free the double pointers seperately.
like,
free(obj1->point2sumthing1);
free(obj1->point2sumthing2);
free(obj1)
Otherwise there will be memory leak



Thanks

"wanwan" <er*******@yahoo.com> writes:

[three malloc()s, one free()]

if I have the following structure and do the following procedure, will
I properly free up all allocated memory of the struture at the end?

No. In general malloc() and free() should be paired. If you get
a pointer from malloc(), then you need to free() it yourself.
--
Ben Pfaff
email: bl*@cs.stanford.edu
web: http://benpfaff.org

thx for responding.

How about if I do free(obj1->point2sumthing1) while it points to NULL?
Will it give me a runtime error?

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