Compilation conditionnelle (directive)

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<source lang="delphi"> begin

 {$IFDEF XX}
 // code if XX is defined
 {$ELSE}
 // code if XX is not defined
 {$ENDIF}

end; </source>

<source lang="delphi"> begin

 {$IFNDEF XX}
 // code if XX is not defined
 {$ELSE}
 // code if XX is defined
 {$ENDIF}

end; </source>