MATH_ERRNO, MATH_ERREXCEPT, math_errhandling
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<tbody> </tbody> #define MATH_ERRNO 1 |
( C++11) | |
#define MATH_ERREXCEPT 2 |
( C++11) | |
#define math_errhandling /*implementation defined*/ |
( C++11) | |
math_errhandling int, MATH_ERRNO, MATH_ERREXCEPT OR (MATH_ERRNO | MATH_ERREXCEPT).:
The macro constant
math_errhandling expands to an expression of type int that is either equal to MATH_ERRNO, or equal to MATH_ERREXCEPT, or equal to their bitwise OR (MATH_ERRNO | MATH_ERREXCEPT).math_errhandling , , :
The value of
math_errhandling indicates the type of error handling that is performed by the floating-point operators and functions: Constant
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Explanation |
MATH_ERREXCEPT
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, : FE_DIVBYZERO, FE_INVALID, FE_OVERFLOW
<cfenv> .: indicates that floating-point exceptions are used: at least FE_DIVBYZERO, FE_INVALID, and FE_OVERFLOW are defined in <cfenv>. |
MATH_ERRNO
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# ( , , ,
std::sqrt(-1), std::log(-1), std::acos(2)). MATH_ERRNO , EDOM errno. MATH_ERREXCEPT , FE_INVALID .:
# Domain error (input argument is outside the range in which the operation is mathematically defined, e.g.
std::sqrt(-1), std::log(-1), or std::acos(2)). If MATH_ERRNO bit is set, EDOM is assigned to errno. If MATH_ERREXCEPT bit is set, FE_INVALID is raised.# ( , ,
std::atanh(-1), std::log(0.0), std::lgamma(0.0)). MATH_ERRNO , ERANGE errno. MATH_ERREXCEPT , FE_DIVBYZERO FE_OVERFLOW .:
# Range error (the mathematical result cannot be represented as the object of specified type, e.g.
std::atanh(-1), std::log(0.0), or std::lgamma(0.0)). If MATH_ERRNO bit is set, ERANGE is assigned to errno. If MATH_ERREXCEPT bit is set, FE_DIVBYZERO or FE_OVERFLOW is raised.# Overflow ( , , , , , std::exp ). MATH_ERRNO , ERANGE errno. MATH_ERREXCEPT , FE_OVERFLOW .
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# Overflow (the mathematical result is finite, but too big to be represented without extreme roundoff error, e.g. functions such as std::exp with sufficiently large arguments). If MATH_ERRNO bit is set, ERANGE is assigned to errno. If MATH_ERREXCEPT bit is set, FE_OVERFLOW is raised.
# Underflow ( , , , , ,
std::sin(subnormal) ). MATH_ERRNO , ERANGE errno. MATH_ERREXCEPT , FE_UNDERFLOW .:
# Underflow (the mathematical result is non-zero, but too small to be represented without extreme roundoff error, e.g. the result is subnormal, as in
std::sin(subnormal) or for many other functions with subnormal arguments). If MATH_ERRNO bit is set, ERANGE may be assigned to errno. If MATH_ERREXCEPT bit is set, FE_UNDERFLOW may be raised.| : |
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| , , POSIX (macro variable) |