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First, saves the current floating-point environment to the object pointed to by
envp (similar to fegetenv), then clears all floating-point status flags, and then installs the non-stop mode: future floating-point exceptions will not interrupt execution (will not trap), until the floating-point environment is restored by feupdateenv or fesetenv.
This function may be used in the beginning of a subroutine that must hide the floating-point exceptions it may raise from the caller. If only some exceptions must be suppressed, while others must be reported, the non-stop mode is usually ended with a call to feupdateenv after clearing the unwanted exceptions.
|envp||-||pointer to the object of type fenv_t where the floating-point environment will be stored|
0 on success, non-zero otherwise.
|This section is incomplete|
Reason: no example
C++ documentation for feholdexcept