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)
