45 lines
1.1 KiB
Rust
45 lines
1.1 KiB
Rust
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// Eryn Wells <eryn@erynwells.me>
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use rand::{rngs::StdRng, RngCore, SeedableRng};
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pub struct RandomNumberGenerator {
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rng: StdRng,
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}
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impl RandomNumberGenerator {
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/// A default value for hashing chess games.
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///
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/// This value is the SHA-256 hash of a PGN I downloaded from the internet
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/// of the six games Kasparov played against Deep Blue in 1996.
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#[rustfmt::skip]
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const DEFAULT_SEED_VALUE: [u8; 32] = [
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0x22, 0x0b, 0xae, 0xd5, 0xc5, 0xb8, 0x20, 0xb1,
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0xee, 0x05, 0x4b, 0x72, 0x73, 0x4c, 0x1a, 0xf9,
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0xc2, 0xb7, 0x5d, 0x87, 0xc8, 0xa9, 0x44, 0x87,
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0x01, 0xda, 0xdb, 0xe0, 0x8e, 0xf8, 0xe8, 0x77,
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];
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#[must_use]
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pub fn new(seed: <StdRng as SeedableRng>::Seed) -> Self {
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let rng = StdRng::from_seed(seed);
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Self { rng }
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}
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#[must_use]
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pub fn rand(&mut self) -> &mut StdRng {
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&mut self.rng
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}
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pub fn next_u64(&mut self) -> u64 {
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self.rng.next_u64()
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}
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}
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impl Default for RandomNumberGenerator {
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fn default() -> Self {
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let rng = StdRng::from_seed(Self::DEFAULT_SEED_VALUE);
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Self { rng }
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}
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}
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