在C编程中定义并初始化此数据类型

Question

Could someone let me know if this is the correct definition of this datatype and if the way I've initialised it is correct?

typedef int const * (* const DataOne)(const int *);

=> The above datatype shows a constant pointer to a function that takes a pointer to a constant int as a parameter and returns a pointer to a constant int .

=> initialised and declaration: DataOne = &myFunction(7);

Answer 1

typedef int const * (* const DataOne)(const int *);

=> the above datatype shows a constant pointer to a function that takes a pointer to a constant int as a parameter and returns a pointer to a constant int.

Correct.

=> initialised and declaration: DataOne = &myFunction(7);

Not correct. Function pointer assignment cannot be made on a function call (ie you cannot have any actual arguments for the parameters). Also, DataOne is a type, not a variable. So, it should look something like this:

int const * myFunction(const int*);
DataOne myPointer = myFunction;  // &myFunction would also work

To declare an equivalent function pointer without a type:

int const * myFunction(const int*);
int const * (* const functionPointer)(const int *) = myFunction;