blitz-research
52 lines
1.3 KiB
HTML
52 lines
1.3 KiB
HTML
<html>
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<title>Blitz3D Docs</title>
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<link rel=stylesheet href=../css/commands.css type=text/css>
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<body>
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<h1>Null</h1>
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<h1>Parameters</h1>
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None
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<h1>Description</h1>
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Designates a Null Type object. Useful for making a Type variable point to nothing or checking if a Type object exists. Also, useful for checking that there are still objects left on the end of a Type list using the After command.
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Can used for testing and setting.
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See also: <a class=small href=Type.htm>Type</a>, <a class=small href=New.htm>New</a>, <a class=small href=Delete.htm>Delete</a>, <a class=small href=After.htm>After</a>, <a class=small href=Before.htm>Before</a>, <a class=small href=First.htm>First</a>, <a class=small href=Last.htm>Last</a>.
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<h1><a href=../2d_examples/Null.bb>Example</a></h1>
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; Null example
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Type Alien
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Field x,y
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End Type
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a.Alien = New Alien
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If a <> Null Then Print "Alien exists!"
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Delete a
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if a = Null Then Print "Alien gone!"
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<br>
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<a target=_top href=../index.htm>Index</a><br>
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<br>
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Click <a href=http://www.blitzbasic.co.nz/b3ddocs/command.php?name=Null&ref=comments target=_blank>here</a> to view the latest version of this page online</body>
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</html>
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