4 files changed, 9 insertions, 9 deletions
diff --git a/include/plist/Array.h b/include/plist/Array.h
index 69ff26f..745b750 100644
--- a/include/plist/Array.h
+++ b/include/plist/Array.h
@@ -44,7 +44,7 @@ public :
     void Insert(Node* node, unsigned int pos);
     void Remove(Node* node);
     void Remove(unsigned int pos);
-    unsigned int GetNodeIndex(Node* node);
+    unsigned int GetNodeIndex(Node* node) const;
 
 private :
     std::vector<Node*> _array;
diff --git a/include/plist/Structure.h b/include/plist/Structure.h
index 8e609da..eded8b2 100644
--- a/include/plist/Structure.h
+++ b/include/plist/Structure.h
@@ -34,10 +34,10 @@ class Structure : public Node
 public :
     virtual ~Structure();
 
-    uint32_t GetSize();
+    uint32_t GetSize() const;
 
-    std::string ToXml();
-    std::vector<char> ToBin();
+    std::string ToXml() const;
+    std::vector<char> ToBin() const;
 
     virtual void Remove(Node* node) = 0;
 
diff --git a/src/Array.cpp b/src/Array.cpp
index 3036476..7c38a69 100644
--- a/src/Array.cpp
+++ b/src/Array.cpp
@@ -141,9 +141,9 @@ void Array::Remove(unsigned int pos)
     _array.erase(it);
 }
 
-unsigned int Array::GetNodeIndex(Node* node)
+unsigned int Array::GetNodeIndex(Node* node) const
 {
-    std::vector<Node*>::iterator it = std::find(_array.begin(), _array.end(), node);
+    std::vector<Node*>::const_iterator it = std::find(_array.begin(), _array.end(), node);
     return std::distance (_array.begin(), it);
 }
 
diff --git a/src/Structure.cpp b/src/Structure.cpp
index 18b19ef..70150c2 100644
--- a/src/Structure.cpp
+++ b/src/Structure.cpp
@@ -35,7 +35,7 @@ Structure::~Structure()
 {
 }
 
-uint32_t Structure::GetSize()
+uint32_t Structure::GetSize() const
 {
     uint32_t size = 0;
     plist_type type = plist_get_node_type(_node);
@@ -50,7 +50,7 @@ uint32_t Structure::GetSize()
     return size;
 }
 
-std::string Structure::ToXml()
+std::string Structure::ToXml() const
 {
     char* xml = NULL;
     uint32_t length = 0;
@@ -60,7 +60,7 @@ std::string Structure::ToXml()
     return ret;
 }
 
-std::vector<char> Structure::ToBin()
+std::vector<char> Structure::ToBin() const
 {
     char* bin = NULL;
     uint32_t length = 0;