std::feraiseexcept
From Cppreference
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| Defined in header <cfenv>
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| int feraiseexcept(int excepts);
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(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.
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[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
#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
[edit] See also
| (C++11)
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clears the specified floating-point status flags (function) |
| (C++11)
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determines which of the specified floating-point status flags are set (function) |