Code:

function GetAnsistringRefcount(const S: string): Cardinal;

asm

or eax, eax

jz @done

sub eax, 8

mov eax, dword ptr [eax]

@done:

end;

procedure TForm1.Button1Click(Sender: TObject);

var

S1, S2: string;

begin

memo1.lines.Add(Format('Refcount at start: %d',

[GetAnsistringRefcount(S1)]));

S1 := StringOfChar('A', 10);

memo1.lines.Add(Format('Refcount after assignment: %d',

[GetAnsistringRefcount(S1)]));

S2 := S1;

memo1.lines.Add(Format('Refcount after S2:=S1: %d',

[GetAnsistringRefcount(S1)]));

S2 := S1 + S2;

memo1.lines.Add(Format('Refcount after S2:=S1+S2: %d',

[GetAnsistringRefcount(S1)]));

end;