| Defined in header
<cfenv> | ||
|---|---|---|
int feraiseexcept( int excepts ); | (since C++11) |
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.
| excepts | - | bitmask listing the exception flags to raise |
0 if all listed exceptions were raised, non-zero value otherwise.
#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
| (C++11)
| clears the specified floating-point status flags (function) |
| (C++11)
| determines which of the specified floating-point status flags are set (function) |
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