在c++中是不允许数组作为函数的返回值的 

int [] someFunction( ); //ILLEGAL 

要想实现函数返回一个数组，那返回对应数组里面类型的指针

you must return a pointer to the array base type and have the pointer point to the array. So, the function declaration would be as follows:

 int* someFunction( ); //Legal

int* doubler( int a[], int size)

{

int* temp = new int[size];

for ( int i =0; i < size; i++)

 temp[i] = 2*a[i];

 return temp;

 }

调用

int a[] = {1, 2, 3, 4, 5};

int* b;

b = doubler(a, 5);

delete[] b