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

C++ Locale Library - in

It used to translate in 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::in.

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

result in (state_type& state, 
   const extern_type* from, const extern_type* from_end, const extern_type*& from_next,
   intern_type* to, intern_type* to_limit, intern_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::in.

#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);

   const char mystr[] = "Tutorialspoint.com";

   wchar_t pwstr[sizeof(mystr)];
   std::mbstate_t mystate = std::mbstate_t();
   const char* pc;
   wchar_t* pwc;

   facet_type::result myresult = myfacet.in (mystate,
      mystr, mystr+sizeof(mystr), pc, pwstr, pwstr+sizeof(mystr), pwc);

   if ( myresult == facet_type::ok ) {
      std::wcout << L"Translation was successful: ";
      std::wcout << pwstr << std::endl;
   }
   return 0;
}

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

Translation was successful: Tutorialspoint.com

locale.htm

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