protected virtual member function
<locale>

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.

See also

codecvt::unshift
Unshift translation state (public member function )

C++