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   feraiseexcept.3p    ( 3 )

точечное исключение (point exception)

Пролог (Prolog)

This manual page is part of the POSIX Programmer's Manual.  The
       Linux implementation of this interface may differ (consult the
       corresponding Linux manual page for details of Linux behavior),
       or the interface may not be implemented on Linux.

Имя (Name)

feraiseexcept — raise floating-point exception

Синопсис (Synopsis)

#include <fenv.h>

int feraiseexcept(int excepts);


Описание (Description)

The functionality described on this reference page is aligned
       with the ISO C standard. Any conflict between the requirements
       described here and the ISO C standard is unintentional. This
       volume of POSIX.1‐2017 defers to the ISO C standard.

The feraiseexcept() function shall attempt to raise the supported floating-point exceptions represented by the excepts argument. The order in which these floating-point exceptions are raised is unspecified, except that if the excepts argument represents IEC 60559 valid coincident floating-point exceptions for atomic operations (namely overflow and inexact, or underflow and inexact), then overflow or underflow shall be raised before inexact. Whether the feraiseexcept() function additionally raises the inexact floating-point exception whenever it raises the overflow or underflow floating-point exception is implementation-defined.


Возвращаемое значение (Return value)

If the argument is zero or if all the specified exceptions were
       successfully raised, feraiseexcept() shall return zero.
       Otherwise, it shall return a non-zero value.

Ошибки (Error)

No errors are defined.

The following sections are informative.


Примеры (Examples)

None.

Использование в приложениях (Application usage)

The effect is intended to be similar to that of floating-point
       exceptions raised by arithmetic operations. Hence, enabled traps
       for floating-point exceptions raised by this function are taken.

Обоснование (Rationale)

Raising overflow or underflow is allowed to also raise inexact
       because on some architectures the only practical way to raise an
       exception is to execute an instruction that has the exception as
       a side-effect. The function is not restricted to accept only
       valid coincident expressions for atomic operations, so the
       function can be used to raise exceptions accrued over several
       operations.

Будущие направления (Future directions)

None.

Смотри также (See also)

feclearexcept(3p), fegetexceptflag(3p), fetestexcept(3p)

The Base Definitions volume of POSIX.1‐2017, fenv.h(0p)