| Description |
The FreeAndNil procedure frees up the memory used by an object, and sets the object reference to nil.
It actually does this in reverse order - first dereferencing the object before deallocating the memory. This is a very clean way of freeing resources.
|
|
| Related commands |
| FreeMem |
|
Free memory storage used by a variable |
| GetMem |
|
Get a specified number of storage bytes |
| Nil |
|
A pointer value that is defined as undetermined |
| Null |
|
A variable that has no value |
|
|
|
| Example code : Free and nil an object, and then try to do this again |
var
myList : TList;
begin
// Create the list object
myList := TList.Create;
// And now free and nil this object
FreeAndNil(myList);
// We can safely do this twice - it ignores nil objects
FreeAndNil(myList);
end;
|
| Show full unit code |
No exception occurs - the second FreeAndNil does nothing.
|
|