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

protected virtual member function

std::codecvt::do_encoding

int do_encoding() const throw();

int do_encoding() const noexcept;

Return encoding width [virtual]

Virtual protected member function called by codecvt::encoding to get the encoding width used by the object.

Polymorphic derived classes can overwrite the behavior of this function.

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