add new methods to PseudoRandom & move this class to util::

2024-09-24 22:37:31 +03:00
parent c987bbd34f
commit 36eed38b4c
3 changed files with 62 additions and 49 deletions
@@ -4,49 +4,63 @@

 #include <ctime>

-class PseudoRandom {
-    unsigned short seed;
-public:
-    PseudoRandom() {
-        seed = (unsigned short)time(0);
-    }
+namespace util {
+    class PseudoRandom {
+        unsigned short seed;
+    public:
+        PseudoRandom() {
+            seed = static_cast<unsigned short>(time(0));
+        }

-    int rand() {
-        seed = (seed + 0x7ed5 + (seed << 6));
-        seed = (seed ^ 0xc23c ^ (seed >> 9));
-        seed = (seed + 0x1656 + (seed << 3));
-        seed = ((seed + 0xa264) ^ (seed << 4));
-        seed = (seed + 0xfd70 - (seed << 3));
-        seed = (seed ^ 0xba49 ^ (seed >> 8));
+        int rand() {
+            seed = (seed + 0x7ed5 + (seed << 6));
+            seed = (seed ^ 0xc23c ^ (seed >> 9));
+            seed = (seed + 0x1656 + (seed << 3));
+            seed = ((seed + 0xa264) ^ (seed << 4));
+            seed = (seed + 0xfd70 - (seed << 3));
+            seed = (seed ^ 0xba49 ^ (seed >> 8));

-        return (int)seed;
-    }
+            return static_cast<int>(seed);
+        }

-    int32_t rand32() {
-        return (rand() << 16) | rand();
-    }
+        int32_t rand32() {
+            return (rand() << 16) | rand();
+        }

-    uint32_t randU32() {
-        return (rand() << 16) | rand();
-    }
+        uint32_t randU32() {
+            return (rand() << 16) | rand();
+        }

-    int64_t rand64() {
-        uint64_t x = randU32();
-        uint64_t y = randU32();
-        return (x << 32ULL) | y;
-    }
+        int64_t rand64() {
+            uint64_t x = randU32();
+            uint64_t y = randU32();
+            return (x << 32ULL) | y;
+        }

-    void setSeed(int number) {
-        seed =
-            ((unsigned short)(number * 23729) ^ (unsigned short)(number + 16786)
-            );
-        rand();
-    }
-    void setSeed(int number1, int number2) {
-        seed =
-            (((unsigned short)(number1 * 23729) |
-              (unsigned short)(number2 % 16786)) ^
-             (unsigned short)(number2 * number1));
-        rand();
-    }
-};
+        uint64_t randU64() {
+            uint64_t x = randU32();
+            uint64_t y = randU32();
+            return (x << 32ULL) | y;
+        }
+
+        float randFloat() {
+            return randU32() / static_cast<float>(UINT32_MAX);
+        }
+
+        double randDouble() {
+            return randU64() / static_cast<double>(UINT64_MAX);
+        }
+
+        void setSeed(int number) {
+            seed = (static_cast<unsigned short>(number * 23729) ^ 
+                    static_cast<unsigned short>(number + 16786));
+            rand();
+        }
+        void setSeed(int number1, int number2) {
+            seed = ((static_cast<unsigned short>(number1 * 23729) |
+                    static_cast<unsigned short>(number2 % 16786)) ^
+                    static_cast<unsigned short>(number2 * number1));
+            rand();
+        }
+    };
+}