Single-Allocation Variable-Sized Array

[Nordlöw via Digitalmars-d-learn]

What's the preferred way in D to implement single-allocation 
variable-sized arrays such as

/** Single-Allocation Array. */
struct ArrayN
{
     ubyte length;  // <= maxLength
     size room;     // allocated length
     ubyte[0] data; // `room` number of bytes follows
}

where insertion/deletion typically is done via

     ArrayN* pushBack(ArrayN*, ubyte element);
     ArrayN* popBack(ArrayN*);

which, when needed, will reallocate a new larger/smaller `ArrayN`

?

Further, what's the official name for this structure?