std::feraiseexcept – cppreference.com

std::feraiseexcept

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<metanoindex/>

 
C++
 
Numerik-Bibliothek
Gemeinsame mathematischen Funktionen
Floating-Point-Umgebung
Komplexe Zahlen
Numerische Arrays
Pseudo-Zufallszahlen
Compile-time rationale Arithmetik (C++11)
Generische numerische Operationen
Original:
Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
Floating-Point-Umgebung
Funktionen
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)
Makro Konstanten
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)
 
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definiert in Header <cfenv>
int feraiseexcept( int excepts );
 (seit C++11)
Versuche, alle Fließkomma-Ausnahmen in excepts aufgeführt (eine bitweise OR der Gleitkomma-Ausnahme Makros) zu erhöhen. Wenn eine der Ausnahmen ist FE_OVERFLOW oder FE_UNDERFLOW, kann diese Funktion zusätzlich zu erhöhen FE_INEXACT. Die Reihenfolge, in der die Ausnahmen angehoben ist unbegrenzt, außer dass FE_OVERFLOW und FE_UNDERFLOW werden immer vor FE_INEXACT erhöht .
Original:
Attempts to raise all floating point exceptions listed in excepts (a bitwise OR of the Gleitkomma-Ausnahme Makros). 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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Parameter

excepts -
Bitmaske Auflistung der Ausnahme-Flags zu erheben
Original:
bitmask listing the exception flags to raise
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Rückgabewert

0 wenn alle aufgeführten Ausnahmen ausgelöst wurden, nicht den Wert Null sonst .
Original:
0 if all listed exceptions were raised, non-zero value otherwise.
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Beispiel

#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";
    }
}

Output: 

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

Siehe auch