Iterate over primes using a primesieve::iterator object.
#include <iostream>
int main()
{
uint64_t sum = 0;
uint64_t prime;
while ((prime = it.
next_prime()) < 10000000000ull)
sum += prime;
std::cout << "Sum of the primes below 10^10 = " << sum << std::endl;
return 0;
}