sizeof1.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

// Test use of `sizeof' as a template parameter.
// Origin: [e-mail]

// { dg-do compile }

template <unsigned I> struct A {};

template <typename SizeType>
struct B
{
char * f() const
{
return (A<sizeof(void *)>::value);
}
};