Weak question: Is the release image free or freeandnil ()

Weak question: Is the release image free or freeandnil () Delphi/Windows SDK/API?
Http://www.delphi2007.net/DelphiMultimedia/html/delphi_20061008161749264.html

Bitmap: = tbitmap. Create ();
......

To release bitmap, use:
Bitmap. Free ();
Still used:
Freeandnil (Bitmap );

Freeandnil (Bitmap) is equivalent to the following two statements
Bitmap. Free;
Bitmap = nil;

If you do not use bitmap after release, for example, do not use
If assigned (Bitmap) then
Or
If bitmap = nil then
Using bitmap. Free will consume less than a few instruction cycles

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Positive Solution

Top 1 Floor

Everything works. It doesn't matter. Compared with your 1 GB memory, one or two bytes are smaller case.

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Minutes ~~~~


Use freeandnil.