Fix compilation warnings for unused variables.

include/ensmallen_bits/callbacks/query_front.hpp

@@ -48,7 +48,7 @@ class QueryFront
            typename MatType,
            typename ObjectivesVecType,
            typename IndicesType>
-  bool GenerationalStepTaken(OptimizerType& opt,
+  bool GenerationalStepTaken(OptimizerType& /* opt */,
                              FunctionType& /* function */,
                              const MatType& /* coordinates */,
                              const ObjectivesVecType& objectives,

include/ensmallen_bits/cmaes/not_empty_transformation.hpp

@@ -9,28 +9,34 @@
  * the 3-clause BSD license along with ensmallen.  If not, see
  * http://www.opensource.org/licenses/BSD-3-Clause for more information.
  */
-#ifndef NOT_EMPTY_TRANSFORMATION
-#define NOT_EMPTY_TRANSFORMATION
+#ifndef ENSMALLEN_CMAES_NOT_EMPTY_TRANSFORMATION
+#define ENSMALLEN_CMAES_NOT_EMPTY_TRANSFORMATION
 
- /*
-  This partial specialization is used to throw an exception when the
-  TransformationPolicyType is EmptyTransformation and call a
-  constructor with parameters 'lowerBound' and 'upperBound' otherwise.
-  This shall be removed when the deprecated constructor is removed in
-  the next major version of ensmallen.
+/**
+ * This partial specialization is used to throw an exception when the
+ * TransformationPolicyType is EmptyTransformation and call a constructor with
+ * parameters 'lowerBound' and 'upperBound' otherwise.  This shall be removed
+ * when the deprecated constructor is removed in the next major version of
+ * ensmallen.
  */
 template<typename T1, typename T2>
-struct NotEmptyTransformation : std::true_type {
-  void Assign(T1& obj, double lowerBound, double upperBound) {
+struct NotEmptyTransformation : std::true_type
+{
+  void Assign(T1& obj, double lowerBound, double upperBound)
+  {
     obj = T1(lowerBound, upperBound);
   }
 };
 
 template<template<typename...> class T, typename... A, typename... B>
-struct NotEmptyTransformation<T<A...>, T<B...>> : std::false_type {
-  void Assign(T<A...>& obj, double lowerBound, double upperBound) {
+struct NotEmptyTransformation<T<A...>, T<B...>> : std::false_type
+{
+  void Assign(T<A...>& /* obj */,
+              double /* lowerBound */,
+              double /* upperBound */)
+  {
     throw std::logic_error("TransformationPolicyType is EmptyTransformation");
   }
 };
 
-#endif
+#endif