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

C++ Locale Library - out

It used to translate out characters and the function stops converting as soon as it fails to convert a character, or once from_end is reached and its character is successfully converted.

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

	
result out (state_type& state, 
   const intern_type* from, const intern_type* from_end, const intern_type*& from_next,
   extern_type* to, extern_type* to_limit, extern_type*& to_next) const;

result out (state_type& state, 
   const intern_type* from, const intern_type* from_end, const intern_type*& from_next,
   extern_type* to, extern_type* to_limit, extern_type*& to_next) const;

• state − It is a state object.

• from, from_end − It is used to find initial and final characters of the source sequence.

• from_next − It is used to find an element in the above range.

• to_next − It is used to find an element in the above range.

It returns codecvt_base::result.

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::out.

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

int main () {
   typedef std::codecvt<wchar_t,char,std::mbstate_t> facet_type;

   std::locale mylocale;

   const facet_type& myfacet = std::use_facet<facet_type>(mylocale);

   std::wstring mywstring;
   std::cout << "Enter a sentence: ";
   std::getline (std::wcin,mywstring);

   std::wstring::size_type length = mywstring.length();

   char* pstr= new char [length+1];
   std::mbstate_t mystate = std::mbstate_t();
   const wchar_t* pwc;
   char* pc;

   facet_type::result myresult = myfacet.out (mystate,
      mywstring.c_str(), mywstring.c_str()+length+1, pwc, pstr, pstr+length+1, pc);

   if (myresult==facet_type::ok)
      std::cout << "Translation successful and sentance should be: " << pstr << '\n';

   delete[] pstr;

   return 0;
}

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

Enter a sentence: sai ram 
Translation successful and sentance should be: sai ram

locale.htm

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