如何初始化与清理属性变量? [英] How to initialize variable with cleanup attribute?
本文介绍了如何初始化与清理属性变量?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
有没有一种方法来初始化与清除
编译器属性的变量?还是我必须声明变量后设置的值?
我试过把清除
在 =的malloc(10)前面的属性;
比如上例中下面和后面 =的malloc(10);
但既不编译。
的#include<&stdio.h中GT;
#包括LT&;&stdlib.h中GT;静态内嵌无效cleanup_buf(字符** BUF)
{
如果(* BUF == NULL)
{
返回;
} 输出(清理\\ n); 免费(* BUF);
}#定义auto_clean __attribute __((清理(cleanup_buf)));INT主要(无效)
{
字符* BUF auto_clean =的malloc(10);
如果(BUF == NULL)
{
的printf(malloc的\\ n);
返回-1;
} 返回0;
}
有没有使用清除
并在同一行初始化变量不同的语法?还是我声明变量就像下面的例子后,所设置的值?
的#include<&stdio.h中GT;
#包括LT&;&stdlib.h中GT;静态内嵌无效cleanup_buf(字符** BUF)
{
如果(* BUF == NULL)
{
返回;
} 输出(清理\\ n); 免费(* BUF);
}/ *请使用我们要自动清理变量此属性。 * /
#定义auto_clean __attribute __((清理(cleanup_buf)));INT主要(无效)
{
字符* BUF auto_clean; BUF = malloc的(10);
如果(BUF == NULL)
{
的printf(malloc的\\ n);
返回-1;
} 返回0;
}
解决方案
只是mistypo。只是......
//#定义auto_clean __attribute __((清理(cleanup_buf)));
// ^
#定义auto_clean __attribute __((清理(cleanup_buf)))
Is there a way to initialize a variable with the cleanup
compiler attribute? or do I have to set the value after declaring the variable?
I've tried putting the cleanup
attribute in front of = malloc(10);
like in the example below and behind = malloc(10);
but neither compiles.
#include <stdio.h>
#include <stdlib.h>
static inline void cleanup_buf(char **buf)
{
if(*buf == NULL)
{
return;
}
printf("Cleaning up\n");
free(*buf);
}
#define auto_clean __attribute__((cleanup (cleanup_buf)));
int main(void)
{
char *buf auto_clean = malloc(10);
if(buf == NULL)
{
printf("malloc\n");
return -1;
}
return 0;
}
Is there a different syntax for using cleanup
and initializing the variable on one line? Or do I have to set the value after declaring the variable like in the example below?
#include <stdio.h>
#include <stdlib.h>
static inline void cleanup_buf(char **buf)
{
if(*buf == NULL)
{
return;
}
printf("Cleaning up\n");
free(*buf);
}
/* Use this attribute for variables that we want to automatically cleanup. */
#define auto_clean __attribute__((cleanup (cleanup_buf)));
int main(void)
{
char *buf auto_clean;
buf = malloc(10);
if(buf == NULL)
{
printf("malloc\n");
return -1;
}
return 0;
}
解决方案
Just mistypo. just...
//#define auto_clean __attribute__((cleanup (cleanup_buf)));
// ^
#define auto_clean __attribute__((cleanup (cleanup_buf)))
这篇关于如何初始化与清理属性变量?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文