What is the "real" amount of memory occupied by a dynamic array?

Question

Example:

procedure Test;
var
  AText: array of AnsiChar;
begin
  SetLength(AText, 7);
end;

Question

What is the real size of AText used in memory? Is it 7 + the cardinal size of its length, that is, 7 + 4 = 11 bytes?

Answer 1

This is plus 4 bytes of reference counting. And, of course, the heapmanager overhead (which depends on the delphi version and uses a memory manager, which can easily be 12-16 bytes).

So this means:

• sizeof (element) * elementcount
• SizeOf (RefCount)
  
  • current implementations: sizeof (integer) = 4
• SizeOf (elementnumber)
  
  • FPC actually stores the highest element, not the element. I do not know about Delphi)
  • current implementations: sizeof (integer) = 4
• overhead.
  • , .
  • , ( ). .
  • 16 32.