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ae5687e4b0
For the tests that make use of internal implementation details, we include the module to test using #[path] in alloctests now.
29 lines
676 B
Rust
29 lines
676 B
Rust
/// XorShiftRng
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pub(crate) struct DeterministicRng {
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count: usize,
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x: u32,
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y: u32,
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z: u32,
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w: u32,
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}
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impl DeterministicRng {
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pub(crate) fn new() -> Self {
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DeterministicRng { count: 0, x: 0x193a6754, y: 0xa8a7d469, z: 0x97830e05, w: 0x113ba7bb }
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}
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/// Guarantees that each returned number is unique.
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pub(crate) fn next(&mut self) -> u32 {
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self.count += 1;
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assert!(self.count <= 70029);
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let x = self.x;
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let t = x ^ (x << 11);
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self.x = self.y;
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self.y = self.z;
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self.z = self.w;
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let w_ = self.w;
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self.w = w_ ^ (w_ >> 19) ^ (t ^ (t >> 8));
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self.w
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}
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}
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