Filename and line information
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Inklusive anderen Quelldatei in aktuellen Quelldatei an der Linie sofort nach der Richtlinie .
Original:
Includes other source file into current source file at the line immediately after the directive .
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Inhaltsverzeichnis |
[Bearbeiten] Syntax
#line lineno
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(1) | ||||||||
#line lineno "filename"
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(2) | ||||||||
[Bearbeiten] Erklärung
Ändert die aktuelle Präprozessor Zeilennummer lineno. Erweiterungen des Makros __LINE__ über diesen Punkt hinaus wird lineno plus der Anzahl der tatsächlichen Zeilen Quelltext gestoßen, da zu erweitern .
2) Original:
Changes the current preprocessor line number to lineno. Expansions of the macro __LINE__ beyond this point will expand to lineno plus the number of actual source code lines encountered since.
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Auch ändert die aktuelle Präprozessor Dateinamen filename. Erweiterungen des Makros __FILE__ von diesem Punkt produziert filename .
Original:
Also changes the current preprocessor file name to filename. Expansions of the macro __FILE__ from this point will produce filename.
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Jede Vorverarbeitung Token (Makro-Konstanten oder Ausdrücke) werden als Argumente an
#line zulässig, solange sie zu erweitern, um eine gültige Dezimalzahl gegebenenfalls nach eine gültige Zeichenkette .Original:
Any preprocessing tokens (macro constants or expressions) are permitted as arguments to
#line as long as they expand to a valid decimal integer optionally following a valid character string.The text has been machine-translated via Google Translate.
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[Bearbeiten] Notes
Diese Richtlinie wird durch Verwendung einige automatische Codegenerierung Werkzeuge, die C + +-Quellcode-Dateien erzeugen aus einer Datei in einer anderen Sprache geschrieben. In diesem Fall kann
#line Richtlinien eingefügt werden die erzeugten C + +-Datei verweisen Zeilennummern und den Dateinamen des ursprünglichen (human-editierbar) Quelldatei.Original:
This directive is used by some automatic code generation tools which produce C++ source files from a file written in another language. In that case,
#line directives may be inserted in the generated C++ file referencing line numbers and the file name of the original (human-editable) source file.The text has been machine-translated via Google Translate.
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[Bearbeiten] Beispiel
#include <cassert> #define FNAME "test.cc" int main() { #line 777 FNAME assert(2+2 == 5); }
Output:
test: test.cc:777: int main(): Assertion `2+2 == 5' failed.
