#include <iostream>
 
namespace detail
{
    template <typename T> struct helper;
 
    template <typename T> struct helper<T*> { void operator() () const {std::cout << "pointer\n";} };
    template <typename T, std::size_t N> struct helper<T[N]> { void operator() ()const {std::cout << "array\n";} };
}
 
 
template <typename T>
void f(const T& )
{
    detail::helper<T>{}();
}
 
int main() {
    const char a[] = "toto";
    const char*p = "toto";
 
    f(a);
    f(p);
    f("toto");
 
}
 

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