10 files changed, 10 insertions, 10 deletions
diff --git a/include/plist/Array.h b/include/plist/Array.h
index 745b750..1b7728a 100644
--- a/include/plist/Array.h
+++ b/include/plist/Array.h
@@ -34,7 +34,7 @@ public :
     Array(Node* parent = NULL);
     Array(plist_t node, Node* parent = NULL);
     Array(const Array& a);
-    Array& operator=(Array& a);
+    Array& operator=(const Array& a);
     virtual ~Array();
 
     Node* Clone() const;
diff --git a/include/plist/Boolean.h b/include/plist/Boolean.h
index 307a1ff..9ecbc48 100644
--- a/include/plist/Boolean.h
+++ b/include/plist/Boolean.h
@@ -33,7 +33,7 @@ public :
     Boolean(Node* parent = NULL);
     Boolean(plist_t node, Node* parent = NULL);
     Boolean(const Boolean& b);
-    Boolean& operator=(Boolean& b);
+    Boolean& operator=(const Boolean& b);
     Boolean(bool b);
     virtual ~Boolean();
 
diff --git a/include/plist/Data.h b/include/plist/Data.h
index a100d28..b566a6c 100644
--- a/include/plist/Data.h
+++ b/include/plist/Data.h
@@ -34,7 +34,7 @@ public :
     Data(Node* parent = NULL);
     Data(plist_t node, Node* parent = NULL);
     Data(const Data& d);
-    Data& operator=(Data& b);
+    Data& operator=(const Data& b);
     Data(const std::vector<char>& buff);
     virtual ~Data();
 
diff --git a/include/plist/Date.h b/include/plist/Date.h
index 510a349..3cfb7d1 100644
--- a/include/plist/Date.h
+++ b/include/plist/Date.h
@@ -35,7 +35,7 @@ public :
     Date(Node* parent = NULL);
     Date(plist_t node, Node* parent = NULL);
     Date(const Date& d);
-    Date& operator=(Date& d);
+    Date& operator=(const Date& d);
     Date(timeval t);
     virtual ~Date();
 
diff --git a/include/plist/Dictionary.h b/include/plist/Dictionary.h
index 931a569..a3ac3a7 100644
--- a/include/plist/Dictionary.h
+++ b/include/plist/Dictionary.h
@@ -35,7 +35,7 @@ public :
     Dictionary(Node* parent = NULL);
     Dictionary(plist_t node, Node* parent = NULL);
     Dictionary(const Dictionary& d);
-    Dictionary& operator=(Dictionary& d);
+    Dictionary& operator=(const Dictionary& d);
     virtual ~Dictionary();
 
     Node* Clone() const;
diff --git a/include/plist/Integer.h b/include/plist/Integer.h
index adbc39a..bdabc6f 100644
--- a/include/plist/Integer.h
+++ b/include/plist/Integer.h
@@ -33,7 +33,7 @@ public :
     Integer(Node* parent = NULL);
     Integer(plist_t node, Node* parent = NULL);
     Integer(const Integer& i);
-    Integer& operator=(Integer& i);
+    Integer& operator=(const Integer& i);
     Integer(uint64_t i);
     virtual ~Integer();
 
diff --git a/include/plist/Key.h b/include/plist/Key.h
index e75aabc..bd5f7bc 100644
--- a/include/plist/Key.h
+++ b/include/plist/Key.h
@@ -34,7 +34,7 @@ public :
     Key(Node* parent = NULL);
     Key(plist_t node, Node* parent = NULL);
     Key(const Key& k);
-    Key& operator=(Key& k);
+    Key& operator=(const Key& k);
     Key(const std::string& s);
     virtual ~Key();
 
diff --git a/include/plist/Real.h b/include/plist/Real.h
index c2d55f8..5afb0c0 100644
--- a/include/plist/Real.h
+++ b/include/plist/Real.h
@@ -33,7 +33,7 @@ public :
     Real(Node* parent = NULL);
     Real(plist_t node, Node* parent = NULL);
     Real(const Real& d);
-    Real& operator=(Real& d);
+    Real& operator=(const Real& d);
     Real(double d);
     virtual ~Real();
 
diff --git a/include/plist/String.h b/include/plist/String.h
index 80290b3..9aba16b 100644
--- a/include/plist/String.h
+++ b/include/plist/String.h
@@ -34,7 +34,7 @@ public :
     String(Node* parent = NULL);
     String(plist_t node, Node* parent = NULL);
     String(const String& s);
-    String& operator=(String& s);
+    String& operator=(const String& s);
     String(const std::string& s);
     virtual ~String();
 
diff --git a/include/plist/Uid.h b/include/plist/Uid.h
index 2d8375b..af6e51d 100644
--- a/include/plist/Uid.h
+++ b/include/plist/Uid.h
@@ -33,7 +33,7 @@ public :
     Uid(Node* parent = NULL);
     Uid(plist_t node, Node* parent = NULL);
     Uid(const Uid& i);
-    Uid& operator=(Uid& i);
+    Uid& operator=(const Uid& i);
     Uid(uint64_t i);
     virtual ~Uid();