Primes & random (BigInteger)

Probable primes

BigInteger n("123456789012345678901234567890");
bool ok = n.is_probable_prime(25);
auto p = n.next_prime();

is_probable_prime() delegates to GMP's probabilistic test.

Random

auto x = BigInteger::random_bits(256, 12345);
auto y = BigInteger::random_range(BigInteger("1000000000000"), 12345);

Notes:

• Deterministic given the same seed.
• random_range() requires upperExclusive > 0.