Assigned

Check if a pointer is valid

Declaration

Source position: system.fpd line 34

  function Assigned(P: Pointer) : Boolean;

Description

Assigned returns True if P is non-nil and returns False of P is nil. The main use of Assigned is that Procedural variables, method variables and class-type variables also can be passed to Assigned.

Errors

None

See also

Name	Description
New	Dynamically allocate memory for variable

Example

Program Example96;
{ Program to demonstrate the Assigned function. }
Var P : Pointer;
begin
  If Not Assigned(P) then
    Writeln ('Pointer is initially NIL');
  P:=@P;
  If Not Assigned(P) then
    Writeln('Internal inconsistency')
  else
    Writeln('All is well in FPC')
end.