Input and output routines for Unicode in C++

What source is available in C++ for  recognising UTF-8, UTF-16 and other
file types.
Which I could use in my own programs,

Is there a: Gut and Put Unicode.h and .cpp that has these functions in them?
short int getchar(); takes from input stream recognised as UTF-8, UTF-16 or
some other format and delivers a 16bit character value and increments a
pointer by the right amount.

Many thanks and best regards Trevor Croll