Clean code to printf size_t in C++ (or: Nearest equivalent of C99's %z in C++)

Question

I have some C++ code that prints a size_t:

size_t a;
printf(\"%lu\", a);

I\'d like this to compile without warnings on both 32

Answer 1

here's a possible solution, but it's not quite a pretty one..

template< class T >
struct GetPrintfID
{
  static const char* id;
};

template< class T >
const char* GetPrintfID< T >::id = "%u";


template<>
struct GetPrintfID< unsigned long long > //or whatever the 64bit unsigned is called..
{
  static const char* id;
};

const char* GetPrintfID< unsigned long long >::id = "%lu";

//should be repeated for any type size_t can ever have


printf( GetPrintfID< size_t >::id, sizeof( x ) );