I want to create a function which returns a Function Pointer Array Pointer(ie a pointer points to an array whose elements are Function Pinters). I declared it like:
void (*(*getFuncArrayPointer(int flag)))[3]{}
But I got errors:
returnFuncAttrPointer.c:27:10: error: declaration of ‘getFuncArrayPointer’ as array of voids
returnFuncAttrPointer.c:28: confused by earlier errors, bailing out
Preprocessed source stored into /tmp/ccYiPPru.out file, please attach this to your bugreport.
It seems that It parsed the array's element type is void.
Here is my whole code:
#include <stdio.h>
typedef void (*FUNC)(int);
static void func1(int num)
{
printf("This is func1. num=%d\n", num + 1);
}
static void func2(int num)
{
printf("This is func2. num=%d\n", num + 2);
}
static void func3(int num)
{
printf("This is func3. num=%d\n", num + 3);
}
FUNC funcArray1[] = {func1, func2, func3}; // Function Pointer Array
FUNC funcArray2[] = {func3, func2, func1}; // Function Pointer Array
/* Function Pointer Array Pointer used as a return type */
/* Fcuntion: getFuncArrayPointer(int flag) ==> func Return type: void (*(*func))[3] ==> Array Pointer ==>
* Array Pointer: Array--(*)[3] Elemnet--void (*func) ==> void (*funcArray(int start)) ==> Function Pointer
*/
void (*(*getFuncArrayPointer(int flag)))[3]
{
switch(flag)
{
case 1:
return &funcArray1;
case 2:
return &funcArray2;
default:
return NULL;
}
}
int main()
{
int num;
// (*pfuncArray)[3] ==> Array Pointer
// void (*)(int) ==> Function Pointer
void (*(*pfuncArray[3]))(int); // Function Pointer Array Pointer
printf("input a number: ");
scanf("%d", &num);
pfuncArray = getFuncArrayPointer(num);
if(pfuncArray)
{
(*funcArray)[0](num);
(*funcArray)[1](num);
(*funcArray)[2](num);
}
return 0;
}
GCC version: gcc (GCC) 4.6.2 20111027 (Red Hat 4.6.2-1) Copyright (C) 2011 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
OS: Linux sslvpn 3.6.10-2.fc16.i686.PAE #1 SMP Tue Dec 11 19:10:54 UTC 2012 i686 i686 i386 GNU/Linux
void f1()
{
}
void f2()
{
}
void f3()
{
}
void (*func_arr[3])() = { f1, f2, f3 };
void (*(*getFuncArrayPointer(int flag))[3])()
{
return &func_arr;
}
You could do it like this:
// create array of 3 function pointers
void (*function_array[3])() = {func1, func2, func3};
// function that gets that array and returns it
void (*(*getFParray(int num))[3])()
{
return &function_array;
}
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