Difference between revisions of "$extendedSyntax"
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The [[global compiler directives|global compiler directive]] <syntaxhighlight lang="pascal" inline>{$extendedSyntax on}</syntaxhighlight> turns on additional syntax. | The [[global compiler directives|global compiler directive]] <syntaxhighlight lang="pascal" inline>{$extendedSyntax on}</syntaxhighlight> turns on additional syntax. | ||
The [[FPC]] has this by default ''on''. | The [[FPC]] has this by default ''on''. | ||
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* [[Function|Functions]] can be called as if they were [[Procedure|procedures]]. The function result is discarded. This is potentially harmful if, for example, the function allocated new memory space and returned a pointer to it. | * [[Function|Functions]] can be called as if they were [[Procedure|procedures]]. The function result is discarded. This is potentially harmful if, for example, the function allocated new memory space and returned a pointer to it. | ||
* Integer ''arithmetic'' operations are allowed on [[Pointer|pointers]]. The directive [[$pointerMath|<syntaxhighlight lang="pascal" inline>{$pointerMath}</syntaxhighlight>]] had to be ''on'' for that ''during'' the respective pointer type’s definition. | * Integer ''arithmetic'' operations are allowed on [[Pointer|pointers]]. The directive [[$pointerMath|<syntaxhighlight lang="pascal" inline>{$pointerMath}</syntaxhighlight>]] had to be ''on'' for that ''during'' the respective pointer type’s definition. | ||
| − | * Pointers become ''ordered'' and can be compared using [[Less than|<syntaxhighlight lang="pascal" inline><</syntaxhighlight>]],[[Greater than|<syntaxhighlight lang="pascal" inline>></syntaxhighlight>]], <syntaxhighlight lang="pascal" inline><=</syntaxhighlight> and <syntaxhighlight lang="pascal" inline>>=</syntaxhighlight>. ''Typed'' pointers have to correspond to each other. | + | * Pointers become ''ordered'' and can be compared using [[Less than|<syntaxhighlight lang="pascal" inline><</syntaxhighlight>]],[[Greater than|<syntaxhighlight lang="pascal" inline>></syntaxhighlight>]], <syntaxhighlight lang="pascal" inline><=</syntaxhighlight> and <syntaxhighlight lang="pascal" inline>>=</syntaxhighlight>. ''Typed'' pointers have to correspond to each other. The [[Equal|<syntaxhighlight lang="pascal" inline>=</syntaxhighlight>]] and [[Not equal|<syntaxhighlight lang="pascal" inline><></syntaxhighlight>]] comparisons work ''regardless'' of the <syntaxhighlight lang="pascal" inline>{$extendedSyntax}</syntaxhighlight> state. |
== comparative remarks == | == comparative remarks == | ||
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== see also == | == see also == | ||
* [[Pascal for C users]] | * [[Pascal for C users]] | ||
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Revision as of 16:30, 20 February 2021
│ Deutsch (de) │ English (en) │
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. The=and<>comparisons work regardless of the{$extendedSyntax}state.
comparative remarks
- Standard Pascal does not define any of those “extensions”.
{$X+}and{$X‑}in GPC enables and disables full Extended Pascal compliance.
