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std::feholdexcept

Da cppreference.com.
< cpp‎ | numeric‎ | fenv

 
 
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
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
Virgola mobile ambiente
Funzioni
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 costanti
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 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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[modifica] 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
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[modifica] Valore di ritorno

0 in caso di successo, non-zero altrimenti.
Original:
0 on success, non-zero otherwise.
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[modifica] Vedi anche

ripristina la virgola mobile e solleva l'ambiente precedentemente generare eccezioni
Original:
restores the floating-point environment and raises the previously raise exceptions
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(funzione) [edit]
salva o ripristina l'ambiente corrente in virgola mobile
Original:
saves or restores the current floating point environment
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(funzione) [edit]
predefinito in virgola mobile ambiente
Original:
default floating-point environment
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(macro costante) [edit]