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Floating point environment

De cppreference.com
< c‎ | numeric

 
 
 
Flottant environnement point
Fonctions
Original:
Functions
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feclearexcept (C99)
fetestexcept (C99)
feraiseexcept (C99)
fegetexceptflag
fesetexceptflag
(C99)
(C99)
fegetround
fesetround
(C99)
(C99)
fegetenv
fesetenv
(C99)
feholdexcept (C99)
feupdateenv (C99)
Macro constantes
Original:
Macro constants
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FE_ALL_EXCEPT
FE_DIVBYZERO
FE_INEXACT
FE_INVALID
FE_OVERFLOW
FE_UNDERFLOW
(C99)
FE_DOWNWARD
FE_TONEAREST
FE_TOWARDZERO
FE_UPWARD
(C99)
FE_DFL_ENV (C99)
 
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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[modifier] Types

Defined in header <fenv.h>
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

efface les indicateurs d'état spécifiées à virgule flottante
Original:
clears the specified floating-point status flags
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(fonction) [edit]
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]
soulève les spécifiées exceptions de virgule flottante
Original:
raises the specified floating-point exceptions
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(fonction) [edit]
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]
obtient ou définit direction d'arrondi
Original:
gets or sets rounding direction
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(fonction) [edit]
sauvegarde ou restaure l'environnement actuel point flottant
Original:
saves or restores the current floating point environment
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(fonction) [edit]
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]
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

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