std::feraiseexcept
From cppreference.com
Template:ddcl list begin <tr class="t-dsc-header">
<td>Defined in header
</td>
<cfenv>
<td></td> <td></td> </tr> <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
Run this code
#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
