The C$++$ standard library defines an algorithm std::hash that for some template class T$,$ returns a hash of that function. The hash is a $64-$bit integer that can be used as a secure signature for values of type T$.$ Write either a function object or lambda function that for a reference to the following struct returns a $64-$bit hash value of objects of that type. Compute the hash by using the hash algorithm on each field in the structure and then using a binary xor $($the $"^"$ operator$)$ to combine the three hashes together $($that$\text{'}$s not very good from crypto standpoint but it's simple$).$

struct S $\{$

std::string firstName;

std::string lastName;

std:string address;

int numberOfWidgetsOrdered;

$\}$;