如何解決C2205錯誤（無法用塊範圍初始化extern變量）

Question

int inc(int a) 
{ 
    return (++a); 
} 
int Multi (int *a, int *b, int *c) 
{ 
    return (*c = *a**b); 
} 


typedef int(FUNC1) (int in); 
typedef int(FUNC2) (int *, int *, int *); 

void Show (FUNC2 fun, int arg1, int *arg2) 
{ 
    FUNC1 p = &inc; //this sentence can't access a pointer of a function 
    int temp = p(arg1); 
    fun (&temp, &arg1, arg2); 
    cout<<(*arg2)<<endl; 
} 

int _tmain(int argc, _TCHAR* argv[]) 
{ 
    int a; 
    Show(Multi,10,&a); 
    return 0; 
} 

Answer 1

你已經聲明瞭你的函數指針typedefs錯誤。試試這個：

typedef int(*FUNC1) (int); 
typedef int(*FUNC2) (int *, int *, int *);