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Floating-point environment

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< cpp‎ | numeric

 
 
Numerik-Bibliothek
Gemeinsame mathematischen Funktionen
Floating-Point-Umgebung
Komplexe Zahlen
Numerische Arrays
Pseudo-Zufallszahlen
Compile-time rationale Arithmetik (C++11)
Generische numerische Operationen
Original:
Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
Floating-Point-Umgebung
Funktionen
Original:
Functions
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feclearexcept(C++11)
fetestexcept(C++11)
feraiseexcept(C++11)
fegetexceptflag
fesetexceptflag
(C++11)
(C++11)
fegetround
fesetround
(C++11)
(C++11)
fegetenv
fesetenv
(C++11)
feholdexcept(C++11)
feupdateenv(C++11)
Makro Konstanten
Original:
Macro constants
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FE_ALL_EXCEPT
FE_DIVBYZERO
FE_INEXACT
FE_INVALID
FE_OVERFLOW
FE_UNDERFLOW
(C++11)
FE_DOWNWARD
FE_TONEAREST
FE_TOWARDZERO
FE_UPWARD
(C++11)
FE_DFL_ENV(C++11)
 
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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Inhaltsverzeichnis

[Bearbeiten] Types

Defined in header <cfenv>
fenv_t
Der Typ, der das gesamte Floating-Point-Umgebung
Original:
The type representing the entire floating-point environment
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fexcept_t
Der Typ, der alle Floating-Point-Status-Flags kollektiv
Original:
The type representing all floating-point status flags collectively
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[Bearbeiten] Funktionen

löscht die angegebene Fließkomma-Status-Flags
Original:
clears the specified floating-point status flags
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(Funktion) [edit]
bestimmt, welche der angegebenen Gleitkommazahl Status-Flags gesetzt sind
Original:
determines which of the specified floating-point status flags are set
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(Funktion) [edit]
wirft die angegebenen Gleitkomma-Ausnahmen
Original:
raises the specified floating-point exceptions
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(Funktion) [edit]
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
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(Funktion) [edit]
(C++11)
(C++11)
ab oder legt Rundung Richtung
Original:
gets or sets rounding direction
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(Funktion) [edit]
speichert oder stellt die aktuelle Floating-Point-Umgebung
Original:
saves or restores the current floating point environment
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(Funktion) [edit]
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
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(Funktion) [edit]
stellt die Floating-Point-Umgebung und stellt die zuvor Ausnahmen auslösen
Original:
restores the floating-point environment and raises the previously raise exceptions
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(Funktion) [edit]

[Bearbeiten] Makros

Floating-Point-Ausnahmen
Original:
floating-point exceptions
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(Makro konstant) [edit]
Floating-Point-Rundung Richtung
Original:
floating-point rounding direction
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(Makro konstant) [edit]
Standardmäßig Floating-Point-Umgebung
Original:
default floating-point environment
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(Makro konstant) [edit]

[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 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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