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

C++ Locale Library - narrow

It is used in narrow characters and internally, this function simply calls the virtual protected member do_narrow, which does the above by default in both the generic template and the char specialization (ctype<char>).

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

	
char narrow (char_type c, char dfault) const;

char narrow (char_type c, char dfault) const;

• c − It is a char type.

• low,high − It is a pointer to the beginning and end of the sequence of characters.

• to − It is a pointer to a range of elements of the facet's character type.

• dfault − It is a default character value.

It returns the transformation of c.

If an exception is thrown, there are no changes in the facet object, although characters in the range may have been affected.

The object, and the elements in the range [low,high), are accessed.

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

#include <iostream>
#include <locale>
#include <string>

int main () {
   std::locale loc;
   std::wstring yourname;

   std::cout << "Please enter your a word: ";
   std::getline (std::wcin,yourname);
   std::wstring::size_type length = yourname.length();

   std::cout << "The first (narrow) character in your word is: ";
   std::cout << std::use_facet< std::ctype<wchar_t> >(loc).narrow ( yourname[0], '?' );
   std::cout << '\n';

   std::cout << "The narrow transformation of your word is: ";
   char * pc = new char [length+1];
   std::use_facet< std::ctype<wchar_t> >(loc).narrow ( yourname.c_str(), 
      yourname.c_str()+length+1, '?', pc);
   std::cout << pc << '\n';

   return 0;
}

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

Please enter your a word: sai
The first (narrow) character in your word is: s
The narrow transformation of your word is: sai

locale.htm

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