Move class IBoostingStatistics to namespace "boosting".

cpp/subprojects/boosting/include/mlrl/boosting/statistics/statistics.hpp

@@ -9,32 +9,36 @@
 
 #include <functional>
 
-/**
- * Defines an interface for all classes that provide access to gradients and Hessians which serve as the basis for
- * learning a new boosted rule or refining an existing one.
- */
-class IBoostingStatistics : public IStatistics {
-    public:
-
-        virtual ~IBoostingStatistics() {};
-
-        /**
-         * A visitor function for handling score matrices of the type `CContiguousConstView`.
-         */
-        typedef std::function<void(const CContiguousConstView<float64>&)> DenseScoreMatrixVisitor;
-
-        /**
-         * A visitor function for handling score matrices of the type `SparseSetMatrix`.
-         */
-        typedef std::function<void(const SparseSetMatrix<float64>&)> SparseScoreMatrixVisitor;
-
-        /**
-         * Invokes one of the given visitor functions, depending on which one is able to handle the type of matrix that
-         * is used to store the currently predicted scores.
-         *
-         * @param denseVisitor  The visitor function for handling objects of the type `CContiguousConstView`
-         * @param sparseVisitor The visitor function for handling objects of the type `SparseSetMatrix`
-         */
-        virtual void visitScoreMatrix(DenseScoreMatrixVisitor denseVisitor,
-                                      SparseScoreMatrixVisitor sparseVisitor) const = 0;
-};
+namespace boosting {
+
+    /**
+     * Defines an interface for all classes that provide access to gradients and Hessians which serve as the basis for
+     * learning a new boosted rule or refining an existing one.
+     */
+    class IBoostingStatistics : public IStatistics {
+        public:
+
+            virtual ~IBoostingStatistics() {};
+
+            /**
+             * A visitor function for handling score matrices of the type `CContiguousConstView`.
+             */
+            typedef std::function<void(const CContiguousConstView<float64>&)> DenseScoreMatrixVisitor;
+
+            /**
+             * A visitor function for handling score matrices of the type `SparseSetMatrix`.
+             */
+            typedef std::function<void(const SparseSetMatrix<float64>&)> SparseScoreMatrixVisitor;
+
+            /**
+             * Invokes one of the given visitor functions, depending on which one is able to handle the type of matrix
+             * that is used to store the currently predicted scores.
+             *
+             * @param denseVisitor  The visitor function for handling objects of the type `CContiguousConstView`
+             * @param sparseVisitor The visitor function for handling objects of the type `SparseSetMatrix`
+             */
+            virtual void visitScoreMatrix(DenseScoreMatrixVisitor denseVisitor,
+                                          SparseScoreMatrixVisitor sparseVisitor) const = 0;
+    };
+
+}