指针的释放方式

#include   <stdio.h>  
#include   <stdlib.h>
#include   <malloc.h>
#include   <assert.h>
double *Alloc_Double_Array(long length)
{
    double *array = NULL;
   
    if( NULL == (array = new double [length]) )
    {
        fprintf(stdout, "Merory Exhausted\n");
        return NULL;
    }
   
    //memset(array, 0, length*sizeof(double));
    return array;
}

template <typename T>
void Free_Array (T **array)
{   
    assert( array != NULL);
    //printf("array=0x%p,*array=0x%p\n",array,*array);
    delete  *array;
} // Free_Array(&p1);

template <typename T>
void FreeArray (T *array)
{   
    assert( array != NULL);
    delete  *array;
} // Free_Array(&p2);

int main()  
{  
    double *p1 = Alloc_Double_Array(0x100);
    double *p2 = Alloc_Double_Array(0x100);
    printf("p1=0x%p,p2=0x%p\n",p1,p2);
    p1[0] = 1.3;
    p2[0] = 2.3;

    Free_Array(&p1);
    printf("first\n");
    p1 = Alloc_Double_Array(0x100);
    p1[0] = 1.3;
    p2[0] = 2.3;
    printf("p1=0x%p,p2=0x%p\n",p1,p2);

    FreeArray(&p2);
    printf("second\n");
    p2 = Alloc_Double_Array(0x100);
    p1[0] = 1.3;
    p2[1] = 2.3;
    printf("p1=0x%p,p2=0x%p\n",p1,p2);
    return 0;
}
为什么采用上述两种方法释放指针均正确》》