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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_locale_max_length.htm below:

C++ Locale Library - max_length

It returns the maximum number of internal characters needed for an external character and internally, this function simply calls the virtual protected member do_max_length to produce its result.

Following is the declaration for std::ctype::max_length.

	
int max_length() const throw();

int max_length() const noexcept;

none

It returns the maximum length of one external character if translated to internal characters.

No-throw guarantee − never throws exceptions even if an exception is thrown, there are no changes in the facet object.

The facet object is accessed.

In below example explains about std::ctype::max_length.

#include <iostream>
#include <locale>

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;
} 

Let us compile and run the above program, this will produce the following result −

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

locale.htm

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