Save exception flags. This function works even if [automatic exception flag handling](\ref HALF_ERRHANDLING_FLAGS) is disabled, but in that case manual flag management is the only way to raise flags. See also:** Documentation for [std::fegetexceptflag](https://en.cppreference.com/w/cpp/numeric/fenv/feexceptflag). \param flagp adress to store flag state at \param excepts OR of flags to save \retva
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