Removed inappropriate uses of const on the be_verbose() functions.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%404186

dlib/optimization/optimization_stop_strategies.h

@@ -44,8 +44,8 @@ namespace dlib
             );
         }
 
-        const objective_delta_stop_strategy& be_verbose( 
-        ) const
+        objective_delta_stop_strategy& be_verbose( 
+        ) 
         {
             _verbose = true;
             return *this;
@@ -83,7 +83,7 @@ namespace dlib
         }
 
     private:
-        mutable bool _verbose;
+        bool _verbose;
 
         bool _been_used;
         double _min_delta;
@@ -123,8 +123,8 @@ namespace dlib
             );
         }
 
-        const gradient_norm_stop_strategy& be_verbose( 
-        ) const
+        gradient_norm_stop_strategy& be_verbose( 
+        ) 
         {
             _verbose = true;
             return *this;
@@ -158,7 +158,7 @@ namespace dlib
         }
 
     private:
-        mutable bool _verbose;
+        bool _verbose;
 
         double _min_norm;
         unsigned long _max_iter;

dlib/optimization/optimization_stop_strategies_abstract.h

@@ -53,8 +53,8 @@ namespace dlib
                   executed.
         !*/
 
-        const objective_delta_stop_strategy& be_verbose( 
-        ) const;
+        objective_delta_stop_strategy& be_verbose( 
+        );
         /*!
             ensures
                 - causes this object to print status messages to standard out 
@@ -120,8 +120,8 @@ namespace dlib
                   max_iter iterations has been executed.
         !*/
 
-        const gradient_norm_stop_strategy& be_verbose( 
-        ) const;
+        gradient_norm_stop_strategy& be_verbose( 
+        );
         /*!
             ensures
                 - causes this object to print status messages to standard out