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std::fetestexcept(3) C++ Standard Libary std::fetestexcept(3) NAME std::fetestexcept - std::fetestexcept Synopsis Defined in header <cfenv> int fetestexcept( int excepts ); (since C++11) Determines which of the specified subset of the floating point ex- ceptions are currently set. The argument excepts is a bitwise OR of the floating point exception macros. Parameters excepts - bitmask listing the exception flags to test Return value Bitwise OR of the floating-point exception macros that are both in- cluded in excepts and correspond to floating-point exceptions currently set. Example // Run this code #include <iostream> #include <cfenv> #include <cmath> #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 << "divsion 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"; } } Output: 1.0/0.0 = inf division by zero reported 1.0/10 = 0.1 inexact result reported sqrt(-1) = -nan invalid result reported See also feclearexcept clears the specified floating-point status flags (C++11) (function) http://cppreference.com 2022.07.31 std::fetestexcept(3)
NAME | Synopsis | Parameters | Return value | Example | Output: | See also
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