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$X or $EXTENDEDSYNTAX : Extended syntax

Extended syntax allows you to drop the result of a function. This means that you can use a function call as if it were a procedure. Standard this feature is on. You can switch it off using the {$X-} or {$EXTENDEDSYNTAX OFF}directive.

The following, for instance, will not compile: 

 function Func (var Arg : sometype) : longint;
 begin
 ...          { declaration of Func }
 end;
 
 ...
 
 {$X-}
 Func (A);
The reason this construct is supported is that you may wish to call a function for certain side-effects it has, but you don’t need the function result. In this case you don’t need to assign the function result, saving you an extra variable.

The command-line compiler switch -Sa1 has the same effect as the {$X+} directive.

By default, extended syntax is assumed.

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