точечные флаги исключения (point exception flags)
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)
fetestexcept — test floating-point exception flags
Синопсис (Synopsis)
#include <fenv.h>
int fetestexcept(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 fetestexcept() function shall determine which of a specified
subset of the floating-point exception flags are currently set.
The excepts argument specifies the floating-point status flags to
be queried.
Возвращаемое значение (Return value)
The fetestexcept() function shall return the value of the
bitwise-inclusive OR of the floating-point exception macros
corresponding to the currently set floating-point exceptions
included in excepts.
Ошибки (Error)
No errors are defined.
The following sections are informative.
Примеры (Examples)
The following example calls function f() if an invalid exception
is set, and then function g() if an overflow exception is set:
#include <fenv.h>
/* ... */
{
#pragma STDC FENV_ACCESS ON
int set_excepts;
feclearexcept(FE_INVALID | FE_OVERFLOW);
// maybe raise exceptions
set_excepts = fetestexcept(FE_INVALID | FE_OVERFLOW);
if (set_excepts & FE_INVALID) f();
if (set_excepts & FE_OVERFLOW) g();
/* ... */
}
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
feclearexcept(3p), fegetexceptflag(3p), feraiseexcept(3p)
The Base Definitions volume of POSIX.1‐2017, fenv.h(0p)
