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   fetestexcept.3p    ( 3 )

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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.

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Имя (Name)

fetestexcept — test floating-point exception flags

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Синопсис (Synopsis)

#include <fenv.h>

       int fetestexcept(int excepts);

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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.

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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.

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Ошибки (Error)

No errors are defined.

       The following sections are informative.

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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();
               /* ... */
           }

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Использование в приложениях (Application usage)

None.

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Обоснование (Rationale)

None.

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Будущие направления (Future directions)

None.

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Смотри также (See also)

feclearexcept(3p), fegetexceptflag(3p), feraiseexcept(3p)

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

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