std::feclearexcept
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Floating-point environment
Functions
feclearexcept
(C++11)
(C++11)
(C++11)
(C++11)(C++11)
(C++11)(C++11)
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Macro constants
(C++11)(C++11)(C++11)(C++11)(C++11)(C++11)
(C++11)(C++11)(C++11)(C++11)
(C++11)
Defined in header
<cfenv>
int feclearexcept( int excepts );
(since C++11)
Attempts to clear the floating-point exceptions that are listed in the bitmask argument excepts, which is a bitwise OR of the floating point exception macros.
Contents
[edit] Parameters
excepts
-
bitmask listing the exception flags to clear
[edit] Return value
0 if all indicated exceptions were successfully cleared or if excepts is zero. Returns a non-zero value on error.
[edit] Example
Run this code
#include <cfenv> #include <cmath> #include <iostream> // #pragma STDC FENV_ACCESS ON volatile double zero = 0.0; // volatile not needed where FENV_ACCESS is supported volatile double one = 1.0; // volatile not needed where FENV_ACCESS is supported int main() { std::feclearexcept(FE_ALL_EXCEPT ); std::cout << "1.0/0.0 = " << 1.0 / zero << '\n'; if (std::fetestexcept (FE_DIVBYZERO )) std::cout << "division by zero reported\n"; else std::cout << "division by zero not reported\n"; std::feclearexcept(FE_ALL_EXCEPT ); std::cout << "1.0/10 = " << one / 10 << '\n'; if (std::fetestexcept (FE_INEXACT )) std::cout << "inexact result reported\n"; else std::cout << "inexact result not reported\n"; std::feclearexcept(FE_ALL_EXCEPT ); std::cout << "sqrt(-1) = " << std::sqrt (-1) << '\n'; if (std::fetestexcept (FE_INVALID )) std::cout << "invalid result reported\n"; else std::cout << "invalid result not reported\n"; }
Possible output:
1.0/0.0 = inf division by zero reported 1.0/10 = 0.1 inexact result reported sqrt(-1) = -nan invalid result reported
[edit] See also
C documentation for feclearexcept