Added iterator for segments and sections

segments and sections were already stored as std::vector<T>.
This change simply exposes the std::vector<T>::iterator functions.

elfio/elfio.hpp

@@ -686,6 +686,15 @@ class elfio
 
             return new_section;
         }
+        
+        std::vector<section*>::iterator begin() {
+            return parent->sections_.begin();
+        }
+
+        std::vector<section*>::iterator end() {
+            return parent->sections_.end();
+        }
+
 
 //------------------------------------------------------------------------------
       private:
@@ -722,6 +731,14 @@ class elfio
             return parent->create_segment();
         }
 
+        std::vector<segment*>::iterator begin() {
+            return parent->segments_.begin();
+        }
+
+        std::vector<segment*>::iterator end() {
+            return parent->segments_.end();
+        }
+
 //------------------------------------------------------------------------------
       private:
         elfio* parent;