assert – cppreference.com
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Die Definition des Makros assert hängt von einem anderen Makro, NDEBUG, die nicht von der Standard-Bibliothek definiert ist .
Original:
The definition of the macro assert depends on another macro, NDEBUG, which is not defined by the standard library.
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Wenn NDEBUG als Makronamen an der Stelle im Quellcode, wo <cassert> enthalten ist definiert wird, dann assert nichts .
Original:
If NDEBUG is defined as a macro name at the point in the source code where <cassert> is included, then assert does nothing.
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Wenn NDEBUG nicht definiert ist, dann assert prüft, ob ihr Argument (das muss skalar Art haben) vergleicht gleich Null. Ist dies der Fall, assert ausgibt Umsetzung Diagnose-Informationen über die Standard-Fehlerausgabe und ruft std::abort. Die Diagnoseinformationen ist erforderlich, um den Text der expression sowie die Werte der Standard-Makros __FILE__, __LINE__, und die Standard-Variable __func__ gehören .
Original:
If NDEBUG is not defined, then assert checks if its argument (which must have scalar type) compares equal to zero. If it does, assert outputs implementation-specific diagnostic information on the standard error output and calls std::abort. The diagnostic information is required to include the text of expression, as well as the values of the standard macros __FILE__, __LINE__, and the standard variable __func__.
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Parameter
| condition | - | Ausdruck der skalaren Typ Original: expression of scalar type The text has been machine-translated via Google Translate. |
Rückgabewert
(None)
Original:
(none)
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Beispiel
#include <iostream> // uncomment to disable assert() // #define NDEBUG #include <cassert> int main() { assert(2+2==4); std::cout << "Execution continues past the first assert\n"; assert(2+2==5); std::cout << "Execution continues past the second assert\n"; }
Output:
Execution continues past the first assert test: test.cc:8: int main(): Assertion `2+2==5' failed. Aborted
Siehe auch
| statische Behauptung | führt Kompilierung assertion checking (seit C++11) Original: performs compile-time assertion checking (seit C++11) The text has been machine-translated via Google Translate. |
verursacht abnormale Beendigung des Programms (ohne Reinigung) Original: causes abnormal program termination (without cleaning up) The text has been machine-translated via Google Translate. (Funktion) [edit] | |