demo2

2026-08-18 02:03:34 +08:00
parent d2cd3b9fa8
commit 517c4cf46e
157 changed files with 16536 additions and 37 deletions
@@ -0,0 +1,34 @@
+#nullable enable
+
+namespace Demo2.Domain
+{
+    public struct DeterministicRandom
+    {
+        private ulong _state;
+        private ulong _increment;
+
+        public DeterministicRandom(ulong seed, ulong stream = 54)
+        {
+            _state = 0;
+            _increment = (stream << 1) | 1;
+            NextUInt();
+            _state += seed;
+            NextUInt();
+        }
+
+        public uint NextUInt()
+        {
+            var oldState = _state;
+            _state = unchecked(oldState * 6364136223846793005UL + _increment);
+            var xorShifted = (uint)(((oldState >> 18) ^ oldState) >> 27);
+            var rotation = (int)(oldState >> 59);
+            return (xorShifted >> rotation) | (xorShifted << ((-rotation) & 31));
+        }
+
+        public int NextInt(int minInclusive, int maxExclusive)
+        {
+            if (maxExclusive <= minInclusive) return minInclusive;
+            return minInclusive + (int)(NextUInt() % (uint)(maxExclusive - minInclusive));
+        }
+    }
+}