Challenge 23 eod.

src/mt19937.rs

@@ -18,8 +18,12 @@ impl MT19937 {
         mt
     }
 
+    pub fn splice(&mut self, state: Vec<u32>) {
+        self.mt = state;
+        self.index = 624;
+    }
+
     pub fn seed(&mut self, seed: u32) {
-        self.index = N;
         const F: u32 = 1812433253;
         self.mt[0] = seed;
         for i in 1..N {
@@ -27,14 +31,14 @@ impl MT19937 {
                 + Wrapping(i as u32))
             .0;
         }
+        self.twist();
     }
 
     pub fn extract_number(&mut self) -> u32 {
-        if self.index >= N {
-            if self.index > N {
-                panic!("Generator was never seeded");
-            }
+        if self.index == N {
             self.twist();
+        } else if self.index > N {
+            panic!("Generator was never seeded");
         }
 
         const S: u32 = 7;