c32rtomb() function in C/C++?

In C++, we can use 32-bit character representations. The c32rtomb() function is used to convert 32-bit character representation to narrow multi-byte character representation. We can find this function inside the uchar.h header file.

This function takes three parameters. These are −

• The string where multi-byte character will be stored
• 32-bit character to convert
• The pointer of type mbstate_t object. which is used to interpret multibyte string.

This function returns number of bytes written to the character array, when it is successful, otherwise returns -1. Let us see an example to get better idea.

Example

#include <iostream>
#include <uchar.h>
#include <wchar.h>
using namespace std;
int main() {
   const char32_t myStr[] = U"Hello World";
   char dest[50];
   mbstate_t p{};
   size_t length;
   int j = 0;
   while (myStr[j]) {
      length = c32rtomb(dest, myStr[j], &p); //get length from c32rtomb() method
      if ((length == 0) || (length > 50))
         break;
      for (int i = 0; i < length; ++i)
         cout << dest[i];
         j++;
   }
}

Output

Hello World