minor code changes

math/distribution/Normal.h

@@ -26,8 +26,13 @@ namespace Distribution {
 		Normal(const T mu, const T sigma) :
 			mu(mu), sigma(sigma), _a(1.0 / (sigma * std::sqrt(2.0 * M_PI))), gen(RANDOM_SEED), dist(mu,sigma) {
 
+#warning "analyze issue when coping an existing distribution and using draw() afterwards. this seems to yield issues"
+
 		}
 
+		/** do not allow copy. this will not work as expected for std::normal_distribution when using draw() ?! */
+		//Normal(const Normal& o) = delete;
+
 		/** get probability for the given value */
 		T getProbability(const T val) const {
 			const T b = -0.5 * ((val-mu)/sigma) * ((val-mu)/sigma);