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

C++ Locale Library - length

It returns the number of external characters in the range [from,from_end) that could be translated into at maximum of max internal characters, output as if applying codecvt::in.

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

	
int length (state_type& state, const extern_type* from,
            const extern_type* from_end, size_t max) const;

int length (state_type& state, const extern_type* from,
            const extern_type* from_end, size_t max) const;

• state − It is a state object.

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

• max − It is used to find maximum length of the translated sequence.

It returns the length of the sequence of characters, in terms of translated 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::length.

#include <iostream>
#include <locale>
#include <cwchar>
#include <cstddef>

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

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

   const char source[] = "sairamkrishna mammahe";
  
   std::mbstate_t mystate;
   const char * pc;
   wchar_t * pwc;

   std::size_t length = myfacet.length (mystate, source, source+sizeof(source), 30);

   wchar_t* dest = new wchar_t[length];
   myfacet.in (mystate, source, source+sizeof(source), pc, dest, dest+length, pwc);

   std::wcout << dest << std::endl;

   delete[] dest;

   return 0;
}

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

sairamkrishna mammahe

locale.htm

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