$extendedSyntax
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The global compiler directive {$extendedSyntax on} turns on additional syntax.
The FPC has this by default on.
The short notation is {$X+}/{$X‑}.
affected syntax
- Functions can be called as if they were procedures. The function result is discarded. This is potentially harmful if, for example, the function allocated new memory space and returned a pointer to it.
- Integer arithmetic operations are allowed on pointers. The directive
{$pointerMath}had to be on for that during the respective pointer type’s definition. - Pointers become ordered and can be compared using
<,>,<=and>=. Typed pointers have to correspond to each other.
comparative remarks
- Standard Pascal does not define any of those “extensions”.
{$X+}and{$X‑}in GPC enables and disables full Extended Pascal compliance.
