Originální popis anglicky:
fetestexcept - test floating-point exception flags
Návod, kniha: POSIX Programmer's Manual
#include <fenv.h>
int fetestexcept(int
excepts);
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.
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.
No errors are defined.
The following sections are informative.
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();
/* ... */
}
None.
None.
None.
feclearexcept() ,
fegetexceptflag() ,
feraiseexcept() , the
Base Definitions volume of IEEE Std 1003.1-2001,
<fenv.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html
.
