[header][C library] cfenv (fenv.h) (C++11)

*[header][C library] cfenv (fenv.h) (C++11)

<cfenv> (fenv.h)

Floating-point environment

This header declares a set of functions and macros to access the floating-point environment, along with specific types.

The floating-point environment maintains a series of status flags and specific control modes. Specific about the contents of the floating-point environment depend on the implementation, but the status flags generally include the floating-point exceptions and their associated information, and the control modes include at least the rounding direction.

Functions

Floating-point exceptions

feclearexcept

Clear floating-point exceptions (function )

feraiseexcept

Raise floating-point exception (function )

fegetexceptflag

Get floating-point exception flags (function )

fesetexceptflag

Set floating-point exception flags (function )

Rounding direction

fegetround

Get rounding direction mode (function )

fesetround

Set rounding direction mode (function )

Entire environment

fegetenv

Get floating-point environment (function )

fesetenv

Set floating-point environment (function )

feholdexcept

Hold floating-point exceptions (function )

feupdateenv

Update floating-point environment (function )

Other

fetestexcept

Test for floating-point exceptions (function )

Types

fenv_t

Floating-point environment type (type )

fexcept_t

Floating-point exceptions type (type )

Macro constants

Floating-point exceptions

FE_DIVBYZERO

Pole error exception (macro )

FE_INEXACT

Inexact result exception (macro )

FE_INVALID

Invalid argument exception (macro )

FE_OVERFLOW

Overflow range error exception (macro )

FE_UNDERFLOW

Underflow range error exception (macro )

FE_ALL_EXCEPT

All exceptions (macro )

Rounding directions

FE_DOWNWARD

Downward rounding direction mode (macro )

FE_TONEAREST

To-nearest rounding direction mode (macro )

FE_TOWARDZERO

Toward-zero rounding direction mode (macro )

FE_UPWARD

Upward rounding direction mode (macro )

Entire evnironment

FE_DFL_ENV

Default environment (macro )

Pragmas

FENV_ACCESS

Access to Floating-point environment (pragma )

내용 출처 : http://www.cplusplus.com/reference/cfenv/