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    Preprocessor

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    Preprocessor
     

    Der Präprozessor wird vor dem Compiler aufgerufen. Das Ergebnis des Präprozessors ist eine Datei, die an den Compiler weitergeleitet wird.

    Richtlinien

    Die Präprozessordirektiven steuern das Verhalten des Präprozessors. Jede Anweisung belegt eine Zeile und hat folgendes Format:

    • # Charakter
    • Präprozessorinstruktion (eine von define, undef, include, if, ifdef, ifndef, else, elif, endif, line, error, pragma)[1]
    • Argumente (abhängig von der Instruktion)
    • Zeilenumbruch

    Die Null-Richtlinie (# gefolgt von einen Zeilenumbruch) ist zulässig und hat keine Auswirkung.

    Fähigkeiten

    Die Übersetzung der Quelldatei kann durch den Präprozessor wie folgt gesteuert werden:

    Das Verhalten des Präprozessors kann wie folgt gesteuert werden:
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    The following aspects of the preprocessor can be controlled:
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    Fussnoten

    1. ↑ Dies sind die Direktiven, die vomStandard definiert sind. Der Standard definiert kein Verhalten für ander Direktiven: sie könen ignoriert werden, eine sinnvolle Bedeutung haben oder einen Copilerfehler erzeugen. Auch wenn sie ignoriert werden, werden sie vom Quellcode entfernt wenn die Verarbeitung des Präprozessors abgeschlossen ist. Eine häufige nicht standardisierte Erweiterung ist die #warning Direktive, die während der Compilation eine benutzerdefinierte Meldung ausgibt.