함수 포인터 반환하는 함수
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#include <stdio.h>
void callback(void (*cb)())
{
cb();
}
void test()
{
printf("hello world!\n");
}
void (*test2(int a))()
{
printf("%d\n", a);
return test;
}
int main(int argv, char** args)
{
callback(test);
callback(test2(1));
}
void (*)() -> void (* 함수원형 ) ()
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