Standard library header <cfenv>

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This header was originally in the C standard library as <fenv.h>.

This header is part of the floating-point environment library.


Types

fenv_t The type representing the entire floating-point environment
fexcept_t The type representing all floating-point status flags collectively

Functions

clears the specified floating-point status flags
(function)
determines which of the specified floating-point status flags are set
(function)
raises the specified floating-point exceptions
(function)
copies the state of the specified floating-point status flags from or to the floating-point environment
(function)
(C++11)(C++11)
gets or sets rounding direction
(function)
saves or restores the current floating point environment
(function)
saves the environment, clears all status flags and ignores all future errors
(function)
restores the floating-point environment and raises the previously raise exceptions
(function)

Macros

floating-point exceptions
(macro constant)
floating-point rounding direction
(macro constant)
default floating-point environment
(macro constant)

Synopsis

namespace std {
    // types
    typedef /*object type*/ fenv_t;
    typedef /*integer type*/ fexcept_t;

    // functions
    int feclearexcept(int except);
    int fegetexceptflag(fexcept_t *pflag, int except);
    int feraiseexcept(int except);
    int fesetexceptflag(const fexcept_t *pflag, int except);
    int fetestexcept(int except);
    int fegetround(void);
    int fesetround(int mode);
    int fegetenv(fenv_t *penv);
    int feholdexcept(fenv_t *penv);
    int fesetenv(const fenv_t *penv);
    int feupdateenv(const fenv_t *penv);
}