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Showing content from https://en.cppreference.com/w/cpp/algorithm/../ranges/../numeric/fenv/feenv.html below:

std::fegetenv, std::fesetenv - cppreference.com

(1) (since C++11) (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)

[edit] Parameters envp - pointer to the object of type std::fenv_t which holds the status of the floating-point environment [edit] Return value

​0​ on success, non-zero otherwise.

[edit] See also saves the environment, clears all status flags and ignores all future errors
(function) [edit] restores the floating-point environment and raises the previously raised exceptions
(function) [edit] default floating-point environment
(macro constant) [edit]

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