Minor changes to avoid compiler warnings in gcc

dlib/svm/structural_object_detection_trainer.h

@@ -93,7 +93,7 @@ namespace dlib
             eps = eps_;
         }
 
-        const scalar_type get_epsilon (
+        scalar_type get_epsilon (
         ) const { return eps; }
 
         void set_max_cache_size (
@@ -149,7 +149,7 @@ namespace dlib
             C = C_;
         }
 
-        const scalar_type get_c (
+        scalar_type get_c (
         ) const
         {
             return C;

dlib/svm/structural_sequence_labeling_trainer.h

@@ -73,7 +73,7 @@ namespace dlib
             eps = eps_;
         }
 
-        const double get_epsilon (
+        double get_epsilon (
         ) const { return eps; }
 
         void set_max_cache_size (

dlib/test/matrix2.cpp

@@ -759,6 +759,7 @@ namespace
             matrix<double,N,N> v;
 
             matrix<double,M,N> a2;  
+            a2 = 0;
             a2 = tmp(a/2);
 
 

dlib/test/object_detector.cpp

@@ -155,7 +155,7 @@ namespace
         inline friend void serialize   ( const very_simple_feature_extractor& item, std::ostream& out)  { serialize(item.feat_image, out); }
         inline friend void deserialize ( very_simple_feature_extractor& item, std::istream& in ) { deserialize(item.feat_image, in); }
 
-        void copy_configuration ( const very_simple_feature_extractor& item){}
+        void copy_configuration ( const very_simple_feature_extractor& ){}
 
     private:
         array2d<unsigned char> feat_image;

dlib/test/sequence_labeler.cpp

@@ -85,9 +85,9 @@ namespace
 
         template <typename EXP>
         bool reject_labeling (
-            const std::vector<sample_type>& x,
-            const matrix_exp<EXP>& y,
-            unsigned long position
+            const std::vector<sample_type>& ,
+            const matrix_exp<EXP>& ,
+            unsigned long 
         ) const
         {
             called_rejct_labeling = true;