Floating-point environment
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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.The text has been machine-translated via Google Translate.
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Inhaltsverzeichnis |
[Bearbeiten] Types
| definiert in Header
<cfenv> | |
| 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. |
[Bearbeiten] Funktionen
| (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) |
| (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) |
| (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) |
| (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) |
| (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) |
| (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) |
| (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) |
| (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) |
[Bearbeiten] Makros
| 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) | |
| 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) | |
| (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) |
[Bearbeiten] 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 SignalSIGFPEerzeugt. Wenn der Compiler-Option-fnon-call-exceptionsverwendet wurde, kann die für dieses Signal werfen einen benutzerdefinierten C + +-Ausnahme .Original:GNU libc functionfeenableexcept()enables trapping of the floating-point exceptions, which generates the signalSIGFPE. If the compiler option-fnon-call-exceptionswas used, the handler for that signal may throw a user-defined C++ exception.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions. - Microsoft WinAPI Funktion
_control87()ermöglicht Abfangen der Floating-Point-Ausnahmen, die eine Hardware-Ausnahme, die C + +-Ausnahmen mit_set_se_translatorumgewandelt 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.The text has been machine-translated via Google Translate.
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