size_t operator()(const Customer &c) const {

}

size_t seed = 0;

hash_val(seed, args...);

return seed;

unordered_set<Customer, CustomerHash> unorderedSet;

unordered_set<Customer,size_t(*)(const Customer&)>custset(20,customer_hash_func);

unordered_set<Customer> unset;

int *p= reinterpret_cast<int *>(new Customer());

cout<<hash_val(p)<<endl;

return 0;