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std::fegetenv, std::fesetenv

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< cpp‎ | numeric‎ | fenv

 
 
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)
 
Defined in header <cfenv>
int fegetenv( std::fenv_t* envp )
(1) (depuis C++11)
int fesetenv( const std::fenv_t* envp );
(2) (depuis C++11)
1)
tente de stocker l'état de l'environnement en virgule flottante dans l'objet pointé par envp .
Original:
Attempts to store the status of the floating-point environment in the object pointed to by envp.
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2)
tentatives pour établir l'environnement en virgule flottante de l'objet pointé par envp. La valeur de cette objet doit être préalablement obtenue par un appel à std::feholdexcept ou std::fegetenv ou une macro à virgule flottante constante. Si l'un des indicateurs d'état à virgule flottante sont mis en envp, ils deviennent définie dans l'environnement (et sont donc vérifiables avec std::fetestexcept), mais les correspondants exceptions de virgule flottante ne sont pas élevés (exécution se poursuit sans interruption)
Original:
Attempts to establish the floating-point environment from the object pointed to by envp. The value of that object must be previously obtained by a call to std::feholdexcept or std::fegetenv or be a floating-point macro constant. If any of the floating-point status flags are set in envp, they become set in the environment (and are then testable with std::fetestexcept), but the corresponding floating-point exceptions are not raised (execution continues uninterrupted)
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[modifier] Paramètres

envp -
Pointeur vers l'objet de std::fenv_t type qui détient le statut de l'environnement en virgule flottante
Original:
pointer to the object of type std::fenv_t which holds the status of the floating-point environment
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[modifier] Retourne la valeur

0 en cas de succès, non nuls autrement .
Original:
0 on success, non-zero otherwise.
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[modifier] Voir aussi

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]
(C++11)
défaut en virgule flottante environnement
Original:
default floating-point environment
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(constante macro) [edit]