From cppreference.com
Defined in header
intfegetenv(std::fenv_t*envp) (1) (since C++11)intfesetenv(conststd::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
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
), 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
(C++11)
saves the environment, clears all status flags and ignores all future errors
(function)
(C++11)
restores the floating-point environment and raises the previously raised exceptions
(function)
(C++11)
default floating-point environment
(macro constant)