/*这里定义了一个新的数据类型init_fnc_t,
*这个数据类型是参数为空,返回值为int的函数。
*/
typedef int (init_fnc_t) (void);
/*init_sequence是一个指针数组,指向的是init_fnc_t类型的函数*/
init_fnc_t *init_sequence[] = {
cpu_init, /* basic cpu dependent setup */
board_init, /* basic board dependent setup */
interrupt_init, /* set up exceptions */
env_init, /* initialize environment */
init_baudrate, /* initialze baudrate settings */
serial_init, /* serial communications setup */
console_init_f, /* stage 1 init of console */
display_banner, /* say that we are here */
dram_init, /* configure available RAM banks */
display_dram_config,
#if defined(CONFIG_VCMA9) || defined (CONFIG_CMC_PU2)
checkboard,
#endif
NULL,
};
/*init_fnc_ptr为指向函数指针的指针*/
init_fnc_t **init_fnc_ptr;
/*init_fnc_ptr初始化指向init_sequence指针数组,下面的循环遇到NULL结束*/
for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
if ((*init_fnc_ptr)() != 0) {/*(*init_fnc_ptr)()为C中调用指针指向的函数*/
hang ();
}
}
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自己写了2个test程序
一个typedef int (test_fnc_t) (void);
一个typedef int (*test_fnc_t) (void);
#include<stdio.h>
int test0 (void);
int test1 (void);
typedef int (*test_fnc_t) (void);
test_fnc_t test_sequence[] = {
test0,
test1,
NULL,
};
//int _tmain(int argc, _TCHAR* argv[])
int main()
{
test_fnc_t *test_fnc_ptr;
for (test_fnc_ptr = test_sequence; *test_fnc_ptr; ++test_fnc_ptr) {
if ((*test_fnc_ptr)() != 0) {
printf("error
here!");
}
}
return 0;
}
int test0 (void)
{
printf("test0\n");
return 0;
}
int test1 (void)
{
printf("test1\n");
return 0;
}
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#include<stdio.h>
int test0 (void);
int test1 (void);
typedef int (test_fnc_t) (void);
test_fnc_t *test_sequence[] = {
test0,
test1,
NULL,
};
//int _tmain(int argc, _TCHAR* argv[])
int main()
{
test_fnc_t **test_fnc_ptr;
for (test_fnc_ptr = test_sequence; *test_fnc_ptr; ++test_fnc_ptr) {
if ((*test_fnc_ptr)() != 0) {
printf("error
here!");
}
}
return 0;
}
int test0 (void)
{
printf("test0\n");
return 0;
}
int test1 (void)
{
printf("test1\n");
return 0;
}