std::feraiseexcept
From cppreference.com
C++
Feature test macros (C++20)
Concepts library (C++20)
Metaprogramming library (C++11)
Ranges library (C++20)
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Numerics library
Mathematical special functions (C++17)
Mathematical constants (C++20)
Basic linear algebra algorithms (C++26)
Data-parallel types (SIMD) (C++26)
Floating-point environment (C++11)
Bit manipulation (C++20)
Saturation arithmetic (C++26)
(C++17)
(C++17)
(C++17)
(C++17)
(C++17)
(C++17)
Floating-point environment
Functions
(C++11)
(C++11)
feraiseexcept
(C++11)
(C++11)(C++11)
(C++11)(C++11)
(C++11)(C++11)
(C++11)
(C++11)
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 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 .
Contents
[edit] Parameters
excepts
-
bitmask listing the exception flags to raise
[edit] Return value
0 if all listed exceptions were raised, non-zero value otherwise.
[edit] Example
Run this code
#include <cfenv> #include <iostream> // #pragma STDC FENV_ACCESS ON int main() { std::feclearexcept (FE_ALL_EXCEPT ); const int r = std::feraiseexcept(FE_UNDERFLOW | FE_DIVBYZERO ); std::cout << "Raising divbyzero and underflow simultaneously " << (r ? "fails" : "succeeds") << " and results in\n"; const 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
[edit] See also
C documentation for feraiseexcept