freepascal.compiler/docs/heapex/heapex.pp

Program heapex;

{ Program used to demonstrate the usage of heaptrc unit }

Uses heaptrc;

Var P1 : ^Longint;
    P2 : Pointer;
    I : longint;
        
begin
  New(P1);
  // causes previous allocation not to be de-allocated
  New(P1);
  Dispose(P1);
  For I:=1 to 10 do
    begin
    GetMem (P2,128);
    // When I is even, deallocate block. We loose 5 times 128
    // bytes this way.
    If (I mod 2) = 0 Then FreeMem(P2,128);
    end;  
  GetMem(P2,128);
  // This will provoke an error and a memory dump
  Freemem (P2,64);
end.