Floating-point environment
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L'environnement en virgule flottante est l'ensemble des indicateurs d'tat virgule flottante et des modes de contrle pris en charge par l'application. Il est thread-local, chaque fil hrite de l'tat initial de l'environnement virgule flottante partir du fil parent. Oprations en virgule flottante modifier les indicateurs d'tat virgule flottante pour indiquer les rsultats anormaux ou de l'information auxiliaire. L'tat des modes de contrle virgule flottante affecte les rsultats de certaines oprations 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'accs l'environnement en virgule flottante et la modification n'a de sens que lorsque
#pragma STDC FENV_ACCESS est rgl sur
ON. Sinon, la mise en uvre est libre de penser que les modes de contrle virgule flottante sont toujours ceux par dfaut et que les indicateurs d'tat virgule flottante ne sont jamais tests ou modifis. Dans la pratique, rares sont les compilateurs actuels prennent en charge la #pragma explicitement, mais la plupart des compilateurs autorisent un accs significatif l'environnement en virgule flottante de toute faon .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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Types
Defined in header
<cfenv> | |
fenv_t
|
Le type qui reprsente l'ensemble de la virgule flottante environnement
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
|
Le type reprsentant tous les indicateurs d'tat virgule flottante collectivement
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. |
Fonctions
(C++11) |
efface les indicateurs d'tat spcifies virgule flottante 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. (fonction) |
(C++11) |
dtermine quels sont les indicateurs spcifis tat virgule flottante sont dfinies 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. (fonction) |
(C++11) |
soulve les spcifies exceptions de virgule flottante 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. (fonction) |
(C++11) (C++11) |
copie de l'tat des drapeaux spcifis tat virgule flottante en provenance ou l'environnement en virgule flottante 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. (fonction) |
(C++11) (C++11) |
obtient ou dfinit direction d'arrondi 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. (fonction) |
(C++11) |
sauvegarde ou restaure l'environnement actuel point flottant 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. (fonction) |
(C++11) |
sauvegarde de l'environnement, efface tous les indicateurs d'tat et ignore toutes les erreurs futures 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. (fonction) |
(C++11) |
restaure l'environnement en virgule flottante et soulve le lever des exceptions prcdemment 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. (fonction) |
Macros
exceptions de virgule flottante 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. (constante macro) | |
direction d'arrondi en virgule flottante 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. (constante macro) | |
(C++11) |
dfaut en virgule flottante environnement 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. (constante macro) |
Notes
Les exceptions en virgule flottante ne sont pas lis aux exceptions C + +. Quand une opration en virgule flottante soulve une exception de virgule flottante, l'tat de l'environnement change flottants, qui peuvent tre tests avec std::fetestexcept, mais l'excution d'un programme C + + sur la plupart des implmentations 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 tre utiliss pour gnrer des exceptions C + + automatiquement chaque fois qu'une exception en virgule flottante est souleve:
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 pigeage des exceptions virgule flottante, ce qui gnre le signal deSIGFPE. Si l'option du compilateur-fnon-call-exceptionsa t utilis, le gestionnaire de ce signal peut jeter dfini par l'utilisateur exception C + + .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._control87()Microsoft WinAPI fonction permet le pigeage des exceptions virgule flottante, ce qui gnre une exception matriel, qui peut tre 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.The text has been machine-translated via Google Translate.
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