std::fegetenv,std::fesetenv(3)

NAME
std::fegetenv,std::fesetenv - std::fegetenv,std::fesetenv

Synopsis
   Defined in header <cfenv>
   int fegetenv( std::fenv_t* envp ) (1) (since C++11)
   int fesetenv( const std::fenv_t* envp ); (2) (since C++11)
   Manages the status of the floating-point environment.
   1) Attempts to store the status of the floating-point environment in the object
   pointed to by envp.
   2) Attempts to establish the floating-point environment from the object pointed to
   by envp. The value of that object must be previously obtained by a call to
   std::feholdexcept or std::fegetenv or be a floating-point macro constant. If any of
   the floating-point status flags are set in envp, they become set in the environment
   (and are then testable with std::fetestexcept), but the corresponding floating-point
   exceptions are not raised (execution continues uninterrupted)

Parameters
   envp - pointer to the object of type std::fenv_t which holds the status of the
          floating-point environment

Return value
   0 on success, non-zero otherwise.

See also
   feholdexcept saves the environment, clears all status flags and ignores all future
   (C++11) errors
                (function)
   feupdateenv restores the floating-point environment and raises the previously
   (C++11) raised exceptions
                (function)
   FE_DFL_ENV default floating-point environment
   (C++11) (macro constant)
   C documentation for
   fegetenv,
   fesetenv