std::feholdexcept

 

C++

Linguaggio

Concetti

Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

Numeri libreria

Comuni funzioni matematiche

Virgola mobile ambiente

I numeri complessi

Array numerici

Pseudo-casuale generazione

In fase di compilazione aritmetica razionale(C++11)

Generici operazioni numeriche Original: Generic numeric operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

iota (C++11)

accumulate

inner_product

adjacent_difference

partial_sum

 

Virgola mobile ambiente

Funzioni Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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 costanti Original: Macro constants The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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)

 

Elemento definito nell'header <cfenv>
int feholdexcept( std::fenv_t* envp )		(dal C++11)

In primo luogo, consente di risparmiare la corrente in virgola mobile ambiente all'oggetto puntato da envp (simile a std::fegetenv), cancella quindi tutte le virgola mobile flag di stato, e quindi installa il non-stop mode: future eccezioni a virgola mobile non interromperà l'esecuzione ( non intrappolare), fino alla virgola mobile ambiente è ripristinata std::feupdateenv o std::fesetenv.

Original:

First, saves the current floating-point environment to the object pointed to by envp (similar to std::fegetenv), then clears all floating-point status flags, and then installs the non-stop mode: future floating-point exceptions will not interrupt execution (will not trap), until the floating-point environment is restored by std::feupdateenv or std::fesetenv.

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Questa funzione può essere utilizzata all'inizio di una subroutine che deve nascondere le eccezioni a virgola mobile può sollevare dal chiamante. Se solo alcune eccezioni devono essere soppressi, mentre altri devono essere segnalati, la non-stop modalità viene in genere si è conclusa con una chiamata a std::feupdateenv dopo aver eliminato le eccezioni indesiderate.

Original:

This function may be used in the beginning of a subroutine that must hide the floating-point exceptions it may raise from the caller. If only some exceptions must be suppressed, while others must be reported, the non-stop mode is usually ended with a call to std::feupdateenv after clearing the unwanted exceptions.

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Parametri

envp

-

puntatore all'oggetto di tipo std::fenv_t dove la virgola ambiente verrà memorizzato Original: pointer to the object of type std::fenv_t where the floating-point environment will be stored The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Valore di ritorno

​0​ in caso di successo, non-zero altrimenti.

Original:

​0​ on success, non-zero otherwise.

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Vedi anche

feupdateenv (C++11)	ripristina la virgola mobile e solleva l'ambiente precedentemente generare eccezioni 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. (funzione)
fegetenv fesetenv (C++11)	salva o ripristina l'ambiente corrente in virgola mobile 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. (funzione)
FE_DFL_ENV (C++11)	predefinito in virgola mobile ambiente 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. (macro costante)