Add TODOs for rvalue references for cma-es and gd

optimization/optimizers/cma_es/cma_es.h

@@ -35,6 +35,7 @@ public:
     inline Eigen::Map<const Eigen::MatrixXd> point();
     Scalar value() { return cmaes_Get(&cma_es_, "fbestever"); }
 
+    // TODO: Support passing initial point by rvalue reference.
     template <typename Objective>
     Eigen::Map<const Eigen::MatrixXd> optimize(
         Objective& objective,

optimization/optimizers/gradient_descent/gradient_descent.h

@@ -25,6 +25,7 @@ public:
     VectorNs<N> const& gradient() const { return gradient_; }
     Scalar value() const { return value_; }
 
+    // TODO: Support passing initial point by rvalue reference.
     template <typename Objective>
     VectorNs<N> const& optimize(Objective& objective, VectorNs<N> const& initial_point);