std::feraiseexcept
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<tbody> </tbody> int feraiseexcept( int excepts ); |
( C++11) | |
,
excepts ( ). FE_OVERFLOW FE_UNDERFLOW, FE_INEXACT. , , , FE_OVERFLOW FE_UNDERFLOW FE_INEXACT.:
Attempts to raise all floating point exceptions listed in
excepts (a bitwise OR of the ). 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.| excepts | ,
|
0, , , .#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";
}
}
:
Raising divbyzero and underflow simultaneously succeeds and results in
division by zero
underflow
.
(C++11) |
() |
(C++11) |
, () |