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      Floating-point environment

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      < cpp‎ | numeric

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      C++
       
      Bibliothèque Numerics
      Fonctions mathématiques courantes
      Virgule flottante environnement
      Nombres complexes
      Tableaux numériques
      La génération de nombres pseudo-aléatoires
      Moment de la compilation arithmétique rationnelle (C++11)
      Génériques des opérations numériques
      Original:
      Generic numeric operations
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      iota (C++11)
      accumulate
      inner_product
      adjacent_difference
      partial_sum
       
      Virgule flottante environnement
      Fonctions
      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)
      Macro constantes
      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)
       
      L'environnement en virgule flottante est l'ensemble des indicateurs d'état à virgule flottante et des modes de contrôle pris en charge par l'application. Il est thread-local, chaque fil hérite de l'état initial de l'environnement à virgule flottante à partir du fil parent. Opérations en virgule flottante modifier les indicateurs d'état à virgule flottante pour indiquer les résultats anormaux ou de l'information auxiliaire. L'état des modes de contrôle à virgule flottante affecte les résultats de certaines opérations en virgule flottante .
      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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      L'accès à l'environnement en virgule flottante et la modification n'a de sens que lorsque #pragma STDC FENV_ACCESS est réglé sur ON. Sinon, la mise en œuvre est libre de penser que les modes de contrôle à virgule flottante sont toujours ceux par défaut et que les indicateurs d'état à virgule flottante ne sont jamais testés ou modifiés. Dans la pratique, rares sont les compilateurs actuels prennent en charge la #pragma explicitement, mais la plupart des compilateurs autorisent un accès significatif à l'environnement en virgule flottante de toute façon .
      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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      Sommaire

      [modifier]Types

      Defined in header <cfenv>
      fenv_t
      Le type qui représente l'ensemble de la virgule flottante environnement
      Original:
      The type representing the entire floating-point environment
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      fexcept_t
      Le type représentant tous les indicateurs d'état à virgule flottante collectivement
      Original:
      The type representing all floating-point status flags collectively
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      [modifier]Fonctions

      (C++11)
      efface les indicateurs d'état spécifiées à virgule flottante
      Original:
      clears the specified floating-point status flags
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      (fonction)[edit]
      (C++11)
      détermine quels sont les indicateurs spécifiés état à virgule flottante sont définies
      Original:
      determines which of the specified floating-point status flags are set
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      (fonction)[edit]
      (C++11)
      soulève les spécifiées exceptions de virgule flottante
      Original:
      raises the specified floating-point exceptions
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      (fonction)[edit]
      (C++11)
      (C++11)
      copie de l'état des drapeaux spécifiés état à virgule flottante en provenance ou à l'environnement en virgule flottante
      Original:
      copies the state of the specified floating-point status flags from or to the floating-point environment
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      (fonction)[edit]
      (C++11)
      (C++11)
      obtient ou définit direction d'arrondi
      Original:
      gets or sets rounding direction
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      (fonction)[edit]
      (C++11)
      sauvegarde ou restaure l'environnement actuel point flottant
      Original:
      saves or restores the current floating point environment
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      (fonction)[edit]
      (C++11)
      sauvegarde de l'environnement, efface tous les indicateurs d'état et ignore toutes les erreurs futures
      Original:
      saves the environment, clears all status flags and ignores all future errors
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      (fonction)[edit]
      (C++11)
      restaure l'environnement en virgule flottante et soulève le lever des exceptions précédemment
      Original:
      restores the floating-point environment and raises the previously raise exceptions
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      (fonction)[edit]

      [modifier]Macros

      (C++11)
      exceptions de virgule flottante
      Original:
      floating-point exceptions
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      (constante macro)[edit]
      (C++11)
      direction d'arrondi en virgule flottante
      Original:
      floating-point rounding direction
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      (constante macro)[edit]
      (C++11)
      défaut en virgule flottante environnement
      Original:
      default floating-point environment
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      (constante macro)[edit]

      [modifier]Notes

      Les exceptions en virgule flottante ne sont pas liés aux exceptions C + +. Quand une opération en virgule flottante soulève une exception de virgule flottante, l'état de l'environnement change flottants, qui peuvent être testés avec std::fetestexcept, mais l'exécution d'un programme C + + sur la plupart des implémentations se poursuit sans interruption .
      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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      Il existe des extensions du compilateur qui peuvent être utilisés pour générer des exceptions C + + automatiquement chaque fois qu'une exception en virgule flottante est soulevée:
      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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      • feenableexcept() GNU libc fonction permet le piégeage des exceptions à virgule flottante, ce qui génère le signal de SIGFPE. Si l'option du compilateur -fnon-call-exceptions a été utilisé, le gestionnaire de ce signal peut jeter défini par l'utilisateur exception C + + .
        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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      • _control87() Microsoft WinAPI fonction permet le piégeage des exceptions à virgule flottante, ce qui génère une exception matériel, qui peut être converti en C + + avec les exceptions _set_se_translator .
        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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      Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=cpp/numeric/fenv&oldid=48800 »
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