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

protected virtual member function

std::codecvt::do_max_length

int do_max_length() const throw();

int do_max_length() const throw();

Return max length of one character [virtual]

Virtual protected member function called by codecvt::max_length to get the maximum length of the multibyte characters used by the object.

Polymorphic derived classes can overwrite the behavior of this function.

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