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std::feraiseexcept(3)	       C++ Standard Libary	   std::feraiseexcept(3)

NAME
     std::feraiseexcept - std::feraiseexcept

Synopsis
	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.

Parameters
	excepts - bitmask listing the exception flags to raise

Return value
	0 if all listed exceptions were raised, non-zero value otherwise.

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

See also
	feclearexcept clears the specified floating-point status flags
	(C++11)       (function)
	fetestexcept  determines which of the  specified  floating-point  status
     flags are set
	(C++11)       (function)
	C documentation for
	feraiseexcept

http://cppreference.com 	   2024.06.10		   std::feraiseexcept(3)
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