Потоковый вывод в никуда

std::ofstream of("/dev/null")

#include <iostream>
 
template< typename CharT, typename Traits = std::char_traits<CharT> >
class Empty_ostream : public std::basic_ostream<CharT, Traits>
{
   using basic_type = std::basic_ostream<CharT, Traits>;
public:
   using basic_type::basic_ostream;
   using basic_type::operator =;
 
   basic_type& operator<<( short value ) {return *this;}
   basic_type& operator<<( unsigned short value ) {return *this;}
   basic_type& operator<<( int value ) {return *this;}
   basic_type& operator<<( unsigned int value ) {return *this;}
   basic_type& operator<<( long value ) {return *this;}
   basic_type& operator<<( unsigned long value ) {return *this;}
   basic_type& operator<<( long long value ) {return *this;}
   basic_type& operator<<( unsigned long long value ) {return *this;}
   basic_type& operator<<( float value ) {return *this;}
   basic_type& operator<<( double value ) {return *this;}
   basic_type& operator<<( long double value ) {return *this;}
   basic_type& operator<<( bool value ) {return *this;}
   basic_type& operator<<( const void* value ) {return *this;}
   basic_type& operator<<( std::basic_streambuf<CharT, Traits>* sb) {return *this;}
   basic_type& operator<<( std::ios_base& (*func)(std::ios_base&) ) {return *this;}
   basic_type& operator<<( std::basic_ios<CharT,Traits>& (*func)(std::basic_ios<CharT,Traits>&) ) {return *this;}
   basic_type& operator<<( basic_type& (*func)(basic_type&) ) {return *this;}
};
 
using e_ostream =  Empty_ostream<char>;
using e_wostream = Empty_ostream<wchar_t>;
 
e_ostream  e_cout;
e_wostream e_wcout;
 
///////////////////////////////////////////////////////////////////////////////////////////
 
template <typename T>
void print(std::ostream& os, const T& val)
{
   os << val;
}
 
int main()
{
   print(std::cout, "Hello");
   print(e_cout, "empty");
}

template <typename U>
   basic_type& operator<<(const U&) {return *this;}