private void[8 * 16] stackSpace
private void[] arr
private uint _length
bool put(T)(T t)
inout(void[]) opSlice()
uint length()
void clear()
~this
private StackBuffer sb
void push(T value)
void opOpAssign(string op : "~")(T value)
inout(T) back()
void popBack()
bool empty()