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std::feraiseexcept

De cppreference.com
< 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 feraiseexcept( int excepts );
(depuis C++11)
Les tentatives visant à sensibiliser toutes les exceptions en virgule flottante figurant dans excepts (un OU binaire entre l'flottant point exception des macros). Si l'une des exceptions est FE_OVERFLOW ou FE_UNDERFLOW, cette fonction peut en outre FE_INEXACT soulever. L'ordre dans lequel les exceptions sont déclenchées n'est pas spécifié, sauf que FE_OVERFLOW et FE_UNDERFLOW sont toujours soulevée devant FE_INEXACT .
Original:
Attempts to raise all floating point exceptions listed in excepts (a bitwise OR of the flottant point exception des macros). If one of the exceptions is FE_OVERFLOW or FE_UNDERFLOW, this function may additionally raise FE_INEXACT. The order in which the exceptions are raised is unspecified, except that FE_OVERFLOW and FE_UNDERFLOW are always raised before FE_INEXACT.
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Sommaire

[modifier] Paramètres

excepts -
masque énumérant les drapeaux d'exceptions à soulever
Original:
bitmask listing the exception flags to raise
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[modifier] Retourne la valeur

0 si toutes les exceptions énumérées ont été soulevées, valeur non nulle sinon .
Original:
0 if all listed exceptions were raised, non-zero value otherwise.
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[modifier] Exemple

#include <iostream>
#include <cfenv>
 
#pragma STDC FENV_ACCESS ON
 
int main()
{
    std::feclearexcept(FE_ALL_EXCEPT);
    int r = std::feraiseexcept(FE_UNDERFLOW | FE_DIVBYZERO);
    std::cout <<  "Raising divbyzero and underflow simultaneously "
              << (r?"fails":"succeeds") << " and results in\n";
    int e = std::fetestexcept(FE_ALL_EXCEPT);
    if (e & FE_DIVBYZERO) {
        std::cout << "division by zero\n";
    }
    if (e & FE_INEXACT) {
        std::cout << "inexact\n";
    }
    if (e & FE_INVALID) {
        std::cout << "invalid\n";
    }
    if (e & FE_UNDERFLOW) {
        std::cout << "underflow\n";
    }
    if (e & FE_OVERFLOW) {
        std::cout << "overflow\n";
    }
}

Résultat :

Raising divbyzero and underflow simultaneously succeeds and results in
division by zero
underflow

[modifier] Voir aussi

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]