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Showing content from https://cplusplus.com/reference/locale/codecvt/do_unshift/ below:

protected virtual member function

std::codecvt::do_unshift

result do_unshift (state_type& state, extern_type* to,                   extern_type* to_limit, extern_type*& to_next) const;

Unshift translation state [virtual]

Virtual protected member function called by codecvt::unshift to restore a state object to its default state.

Polymorphic derived classes can overwrite the behavior of this function.

See codecvt::unshift for its default behavior in codecvt.