Fix for Ruby-rand memory leak

- Also prefixes the "mt" member variable with a "m_"

prngs/Ruby.cpp

@@ -10,11 +10,15 @@
 Ruby::Ruby()
 {
     seedValue = 0;
-    mt = new MT;
-    init_genrand(mt, seedValue);
+    m_mt = new MT;
+    init_genrand(m_mt, seedValue);
 }
 
-Ruby::~Ruby() {}
+Ruby::~Ruby() 
+{
+    delete m_mt;
+    m_mt = NULL;
+}
 
 const std::string Ruby::getName()
 {
@@ -23,9 +27,10 @@ const std::string Ruby::getName()
 
 void Ruby::seed(uint32_t value)
 {
-    mt = new MT;
+    delete m_mt;
+    m_mt = new MT;
     seedValue = value;
-    init_genrand(mt, value);
+    init_genrand(m_mt, value);
 }
 
 uint32_t Ruby::getSeed()
@@ -35,7 +40,7 @@ uint32_t Ruby::getSeed()
 
 uint32_t Ruby::random()
 {
-    return genrand_int32(mt);
+    return genrand_int32(m_mt);
 }
 
 

prngs/Ruby.h

@@ -61,7 +61,7 @@ private:
     void next_state(struct MT *mt);
     uint32_t genrand_int32(struct MT *mt);
 
-    MT *mt;
+    MT *m_mt;
     uint32_t seedValue;
 };