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

public member function

<locale>

int max_length() const throw();

int max_length() const noexcept;

Return max length of one character

Internally, this function simply calls the virtual protected member do_max_length</samp to produce its result.

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// codecvt::max_length example
#include <iostream>       // std::cout
#include <locale>         // std::locale, std::codecvt, std::use_facet

int main ()
{
  std::locale loc;

  std::cout << "max_length for codecvt<char,char,mbstate_t>: ";
  std::cout << std::use_facet<std::codecvt<char,char,mbstate_t> >(loc).max_length();
  std::cout << '\n';

  std::cout << "max_length for codecvt<wchar_t,char,mbstate_t>: ";
  std::cout << std::use_facet<std::codecvt<wchar_t,char,mbstate_t> >(loc).max_length();
  std::cout << '\n';

  return 0;
}

max_length for codecvt<char,char,mbstate_t>: 1
max_length for codecvt<wchar_t,char,mbstate_t>: 5

codecvt::encoding

Return encoding width (public member function)

codecvt::length

Return length of translated sequence (public member function)

codecvt::do_max_length

Return max length of one character [virtual] (protected virtual member function)

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