Floating-point environment – cppreference.com

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Die Floating-Point-Umfeld ist die Menge der Floating-Point-Status-Flags und Regelungsarten durch die Umsetzung unterstützt. Es ist Thread-lokalen, erbt jeder Thread den Anfangszustand seinen Gleitkomma-Umgebung, von der übergeordneten Thread. Floating-Point-Operationen ändern die Floating-Point-Status-Flags auf ungewöhnliche Ergebnisse oder zusätzliche Informationen anzeigen. Der Zustand des Floating-Point-Betriebsarten wirkt sich auf die Ergebnisse von einigen Fließkomma-Operationen .

Original:

The floating-point environment is the set of floating-point status flags and control modes supported by the implementation. It is thread-local, each thread inherits the initial state of its floating-point environment from the parent thread. Floating-point operations modify the floating-point status flags to indicate abnormal results or auxiliary information. The state of floating-point control modes affects the outcomes of some floating-point operations.

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Die Floating-Point-Umgebung Zugang und Änderung ist nur dann sinnvoll, wenn

#pragma STDC FENV_ACCESS

um ON eingestellt ist. Andernfalls wird die Umsetzung ist kostenlos anzunehmen, dass Floating-Point-Betriebsarten immer die standardmässigen und dass Fließkomma-Status-Flags sind nie geprüft oder geändert. In der Praxis unterstützen einige aktuelle Compiler die #pragma explizit, aber die meisten Compiler ermöglichen sinnvollen Zugang zu der Floating-Point-Umgebung sowieso .

Original:

The floating-point environment access and modification is only meaningful when

#pragma STDC FENV_ACCESS

is set to ON. Otherwise the implementation is free to assume that floating-point control modes are always the default ones and that floating-point status flags are never tested or modified. In practice, few current compilers support the #pragma explicitly, but most compilers allow meaningful access to the floating-point environment anyway.

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Types



`fenv_t`	Der Typ, der das gesamte Floating-Point-Umgebung Original: The type representing the entire floating-point environment The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

`fexcept_t`	Der Typ, der alle Floating-Point-Status-Flags kollektiv Original: The type representing all floating-point status flags collectively The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Funktionen


feclearexcept (C++11)	löscht die angegebene Fließkomma-Status-Flags Original: clears the specified floating-point status flags The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion) [edit]

fetestexcept (C++11)	bestimmt, welche der angegebenen Gleitkommazahl Status-Flags gesetzt sind Original: determines which of the specified floating-point status flags are set The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion) [edit]

feraiseexcept (C++11)	wirft die angegebenen Gleitkomma-Ausnahmen Original: raises the specified floating-point exceptions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion) [edit]

fegetexceptflag fesetexceptflag (C++11) (C++11)	kopiert den Zustand der angegebenen Gleitkomma-Statusflags von oder zu der Fließkomma-Umgebung Original: copies the state of the specified floating-point status flags from or to the floating-point environment The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion) [edit]

fegetround fesetround (C++11) (C++11)	ab oder legt Rundung Richtung Original: gets or sets rounding direction The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion) [edit]

fegetenv fesetenv (C++11)	speichert oder stellt die aktuelle Floating-Point-Umgebung Original: saves or restores the current floating point environment The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion) [edit]

feholdexcept (C++11)	schont die Umwelt, löscht alle Status-Flags und ignoriert alle zukünftigen Fehler Original: saves the environment, clears all status flags and ignores all future errors The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion) [edit]

feupdateenv (C++11)	stellt die Floating-Point-Umgebung und stellt die zuvor Ausnahmen auslösen Original: restores the floating-point environment and raises the previously raise exceptions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion) [edit]

Makros


FE_ALL_EXCEPT FE_DIVBYZERO FE_INEXACT FE_INVALID FE_OVERFLOW FE_UNDERFLOW (C++11)	Floating-Point-Ausnahmen Original: floating-point exceptions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Makro konstant) [edit]

FE_DOWNWARD FE_TONEAREST FE_TOWARDZERO FE_UPWARD (C++11)	Floating-Point-Rundung Richtung Original: floating-point rounding direction The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Makro konstant) [edit]

FE_DFL_ENV (C++11)	Standardmäßig Floating-Point-Umgebung Original: default floating-point environment The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Makro konstant) [edit]

Notes

Die Gleitkomma-Exceptions sind nicht auf die C + +-Ausnahmen verwandt. Wenn ein Gleitkommaoperation wirft eine Gleitkomma-Ausnahme, den Status der Floating-Point-Umgebung ändert, die mit std::fetestexcept getestet werden können, aber die Ausführung eines C + +-Programm auf den meisten Implementierungen ungebrochen .

Original:

The floating-point exceptions are not related to the C++ exceptions. When a floating-point operation raises a floating-point exception, the status of the floating-point environment changes, which can be tested with std::fetestexcept, but the execution of a C++ program on most implementations continues uninterrupted.

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Es gibt Compiler-Erweiterungen, die verwendet werden, um C + +-Ausnahmen automatisch generiert, wenn eine Floating-Point-Exception ausgelöst werden können:

Original:

There are compiler extensions that may be used to generate C++ exceptions automatically whenever a floating-point exception is raised:

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GNU libc-Funktion feenableexcept() ermöglicht Abfangen der Floating-Point-Ausnahmen, die das Signal SIGFPE erzeugt. Wenn der Compiler-Option -fnon-call-exceptions verwendet wurde, kann die für dieses Signal werfen einen benutzerdefinierten C + +-Ausnahme .
Original:
GNU libc function feenableexcept() enables trapping of the floating-point exceptions, which generates the signal SIGFPE. If the compiler option -fnon-call-exceptions was used, the handler for that signal may throw a user-defined C++ exception.
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Microsoft WinAPI Funktion _control87() ermöglicht Abfangen der Floating-Point-Ausnahmen, die eine Hardware-Ausnahme, die C + +-Ausnahmen mit _set_se_translator umgewandelt werden kann generiert .
Original:
Microsoft WinAPI function _control87() enables trapping of the floating-point exceptions, which generates a hardware exception, which can be converted to C++ exceptions with _set_se_translator.
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