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#include <iostream>
#include <type_traits>
 
struct Nathan {
    long getHash(){return 0;}
};
 
template <typename T>
void func(T value)
{
    if (std::is_pointer<T>::value)
        std::cout << value->getHash();
    else
        std::cout << value.getHash();
}
 
int main()
{
    Nathan n;
    func(n);
    func(&n);
}
 

prog.cpp: In instantiation of ‘void func(T) [with T = Nathan]’:
prog.cpp:20:11:   required from here
prog.cpp:12:9: error: base operand of ‘->’ has non-pointer type ‘Nathan’
prog.cpp: In instantiation of ‘void func(T) [with T = Nathan*]’:
prog.cpp:21:12:   required from here
prog.cpp:14:9: error: request for member ‘getHash’ in ‘value’, which is of pointer type ‘Nathan*’ (maybe you meant to use ‘->’ ?)

Standard output is empty