title: Is there a way to check whether a string contains unicode characters in C++
body: <p>Is there a way to check whether a string contains unicode characters in C++</p>
  
  <p>I have a string and I need to validate whether it contains unicode(UTF-8 or UTF-16) characters. If it does I need to convert them to ASCII.
  I have some idea about the conversion logic., but need some help in detecting the unicode characters in the string</p>