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Floating-point environment cppreference.com
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    Floating-point environment

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    <metanoindex/>

     
    C++
     
    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 untersttzt. Es ist Thread-lokalen, erbt jeder Thread den Anfangszustand seinen Gleitkomma-Umgebung, von der bergeordneten Thread. Floating-Point-Operationen ndern die Floating-Point-Status-Flags auf ungewhnliche Ergebnisse oder zustzliche Informationen anzeigen. Der Zustand des Floating-Point-Betriebsarten wirkt sich auf die Ergebnisse von einigen Fliekomma-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 nderung 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 standardmssigen und dass Fliekomma-Status-Flags sind nie geprft oder gendert. In der Praxis untersttzen einige aktuelle Compiler die #pragma explizit, aber die meisten Compiler ermglichen 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

    definiert 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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    Funktionen

    (C++11)
    lscht die angegebene Fliekomma-Status-Flags
    Original:
    clears the specified floating-point status flags
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    (Funktion) [edit]
    (C++11)
    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]
    (C++11)
    wirft die angegebenen Gleitkomma-Ausnahmen
    Original:
    raises the specified floating-point exceptions
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    (Funktion) [edit]
    (C++11)
    (C++11)
    kopiert den Zustand der angegebenen Gleitkomma-Statusflags von oder zu der Fliekomma-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]
    (C++11)
    speichert oder stellt die aktuelle Floating-Point-Umgebung
    Original:
    saves or restores the current floating point environment
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    (Funktion) [edit]
    (C++11)
    schont die Umwelt, lscht alle Status-Flags und ignoriert alle zuknftigen Fehler
    Original:
    saves the environment, clears all status flags and ignores all future errors
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    (Funktion) [edit]
    (C++11)
    stellt die Floating-Point-Umgebung und stellt die zuvor Ausnahmen auslsen
    Original:
    restores the floating-point environment and raises the previously raise exceptions
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    (Funktion) [edit]

    Makros

    (C++11)
    Floating-Point-Ausnahmen
    Original:
    floating-point exceptions
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    (Makro konstant) [edit]
    (C++11)
    Floating-Point-Rundung Richtung
    Original:
    floating-point rounding direction
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    (Makro konstant) [edit]
    (C++11)
    Standardmig Floating-Point-Umgebung
    Original:
    default floating-point environment
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    (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 ndert, die mit std::fetestexcept getestet werden knnen, aber die Ausfhrung 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 ausgelst werden knnen:
    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() ermglicht Abfangen der Floating-Point-Ausnahmen, die das Signal SIGFPE erzeugt. Wenn der Compiler-Option -fnon-call-exceptions verwendet wurde, kann die fr 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() ermglicht 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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