垃圾收集器是否保留仅由原始指针引用的数组?

我想从垃圾收集堆中分配一个元素数组,并仅通过原始指针访问这些元素。垃圾收集器是否能够在所有指向它的指针都超出范围之后(而不是之前)回收该内存块?

我想这样做:

{
    int* ptrToArray1 = (new int[](100)).ptr;
    int* ptrToArray2 = ptrToArray1;
    int* ptrToArray3 = ptrToArray1 + 10;

    ptrToArray1 += 50;
    ptrToArray2 += 99;

    *ptrToArray1 = 123;
    *ptrToArray2 = 456;
    *ptrToArray3 = 789;

    ptrToArray1 -= 42;
    ptrToArray2 -= 24;

    //... and so on ... Is the array data guaranteed to be there?
}
// Now that all the pointers are out of scope, can the
// garbage collector reclaim the memory block of that array?