#include <cstdio>
#include <string>
 
template< typename T >
T const &printf_helper( T const &x )
    { return x; }
 
char const *printf_helper( std::string const &x )
    { return x.c_str(); }
 
template< typename ... Req, typename ... Given >
int wrap_printf( int (*fn)( Req ...... ), Given ... args ) {
    return fn( printf_helper( args ) ... );
}
 
int main() {
    wrap_printf( std::printf, "Hello %s\n", std::string( "world!" ) );
    wrap_printf( std::fprintf, stderr, std::string( "Error %d" ), 5 );
}

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