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C++
 
Utilities-Bibliothek
 
Fehlerbehandlung
Exception Handling
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Exception handling
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exception
uncaught_exception
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make_exception_ptr(C++11)
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nested_exception(C++11)
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Ausnahmebehandlung Ausfälle
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Exception handling failures
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terminate
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Assertions
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Assertions
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assert
system_error Anlage
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system_error facility
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error_category(C++11)
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system_error(C++11)
 
definiert in Header <cassert>
#ifdef NDEBUG

#define assert(condition) ((void)0)
#else
#define assert(condition) /*implementation defined*/

#endif
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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Inhaltsverzeichnis

[Bearbeiten] Parameter

condition -
Ausdruck der skalaren Typ
Original:
expression of scalar type
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[Bearbeiten] Rückgabewert

(None)
Original:
(none)
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[Bearbeiten] 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

[Bearbeiten] Siehe auch

statische Behauptung
führt Kompilierung assertion checking (seit C++11)
Original:
performs compile-time assertion checking (seit C++11)
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[edit]
verursacht abnormale Beendigung des Programms (ohne Reinigung)
Original:
causes abnormal program termination (without cleaning up)
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(Funktion) [edit]
Von „https://de.cppreference.com/mwiki/index.php?title=cpp/error/assert&oldid=26667“