1 files changed, 24 insertions, 4 deletions

diff --git a/src/array.h b/src/array.h
index 0fb0df3..e717fd5 100644
--- a/src/array.h
+++ b/src/array.h
@@ -219,12 +219,12 @@ namespace Bu
                                 return *this;
                         }
 
-                        bool operator==( const iterator &oth )
+                        bool operator==( const iterator &oth ) const
                         {
                                 return iPos == oth.iPos;
                         }
 
-                        bool operator!=( const iterator &oth )
+                        bool operator!=( const iterator &oth ) const
                         {
                                 return iPos != oth.iPos;
                         }
@@ -244,6 +244,16 @@ namespace Bu
                                                 "Cannot dereference finished iterator.");
                                 return src[iPos];
                         }
+
+                        operator bool() const
+                        {
+                                return iPos < 0;
+                        }
+
+                        bool isValid() const
+                        {
+                                return iPos < 0;
+                        }
                 } iterator;
                 
                 typedef struct const_iterator
@@ -302,12 +312,12 @@ namespace Bu
                                 return *this;
                         }
 
-                        bool operator==( const const_iterator &oth )
+                        bool operator==( const const_iterator &oth ) const
                         {
                                 return iPos == oth.iPos;
                         }
 
-                        bool operator!=( const const_iterator &oth )
+                        bool operator!=( const const_iterator &oth ) const
                         {
                                 return iPos != oth.iPos;
                         }
@@ -327,6 +337,16 @@ namespace Bu
                                                 "Cannot dereference finished iterator.");
                                 return src[iPos];
                         }
+                        
+                        operator bool() const
+                        {
+                                return iPos < 0;
+                        }
+
+                        bool isValid() const
+                        {
+                                return iPos < 0;
+                        }
                 } const_iterator;
 
                 iterator begin()