Namespaces
Variants
Views
Actions

std::feraiseexcept

From cppreference.com
< cpp‎ | numeric‎ | fenv
Revision as of 22:33, 2 November 2012 by P12bot (Talk | contribs)

Template:ddcl list begin <tr class="t-dsc-header">

<td>
Defined in header <cfenv>
</td>

<td></td> <td></td> <tr class="t-dcl ">

<td >
int feraiseexcept( int excepts );
</td>

<td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> Template:ddcl list end

Attempts to raise all floating point exceptions listed in excepts (a bitwise OR of the floating point exception 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.

Contents

Parameters

excepts - bitmask listing the exception flags to raise

Return value

0 if all listed exceptions were raised, non-zero value otherwise.

Example

#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

See also

Template:cpp/numeric/fenv/dcl list feclearexceptTemplate:cpp/numeric/fenv/dcl list fetestexcept