cpp: Add this comparison to operator= copy assign

Author: Tsuk1ha

src/Array.cpp

@@ -62,6 +62,8 @@ Array::Array(const PList::Array& a) : Structure(a.GetParent())
 
 Array& Array::operator=(const PList::Array& a)
 {
+    if (this == &a) return *this;
+
     plist_free(_node);
     for (size_t it = 0; it < _array.size(); it++) {
         delete _array.at(it);

src/Boolean.cpp

@@ -40,6 +40,8 @@ Boolean::Boolean(const PList::Boolean& b) : Node(PLIST_BOOLEAN)
 
 Boolean& Boolean::operator=(const PList::Boolean& b)
 {
+    if (this == &b) return *this;
+
     plist_free(_node);
     _node = plist_copy(b.GetPlist());
     return *this;

src/Data.cpp

@@ -40,6 +40,8 @@ Data::Data(const PList::Data& d) : Node(PLIST_DATA)
 
 Data& Data::operator=(const PList::Data& b)
 {
+    if (this == &b) return *this;
+
     plist_free(_node);
     _node = plist_copy(b.GetPlist());
     return *this;

src/Date.cpp

@@ -40,6 +40,8 @@ Date::Date(const PList::Date& d) : Node(PLIST_DATE)
 
 Date& Date::operator=(const PList::Date& d)
 {
+    if (this == &d) return *this;
+
     plist_free(_node);
     _node = plist_copy(d.GetPlist());
     return *this;

src/Dictionary.cpp

@@ -65,6 +65,8 @@ Dictionary::Dictionary(const PList::Dictionary& d) : Structure(d.GetParent())
 
 Dictionary& Dictionary::operator=(const PList::Dictionary& d)
 {
+    if (this == &d) return *this;
+
     for (Dictionary::iterator it = _map.begin(); it != _map.end(); it++)
     {
         plist_free(it->second->GetPlist());

src/Integer.cpp

@@ -41,6 +41,8 @@ Integer::Integer(const PList::Integer& i) : Node(PLIST_INT)
 
 Integer& Integer::operator=(const PList::Integer& i)
 {
+    if (this == &i) return *this;
+
     plist_free(_node);
     _node = plist_copy(i.GetPlist());
     return *this;

src/Key.cpp

@@ -40,6 +40,8 @@ Key::Key(const PList::Key& k) : Node(PLIST_INT)
 
 Key& Key::operator=(const PList::Key& k)
 {
+    if (this == &k) return *this;
+
     plist_free(_node);
     _node = plist_copy(k.GetPlist());
     return *this;

src/Real.cpp

@@ -39,6 +39,8 @@ Real::Real(const PList::Real& d) : Node(PLIST_INT)
 
 Real& Real::operator=(const PList::Real& d)
 {
+    if (this == &d) return *this;
+
     plist_free(_node);
     _node = plist_copy(d.GetPlist());
     return *this;

src/String.cpp

@@ -40,6 +40,8 @@ String::String(const PList::String& s) : Node(PLIST_INT)
 
 String& String::operator=(const PList::String& s)
 {
+    if (this == &s) return *this;
+
     plist_free(_node);
     _node = plist_copy(s.GetPlist());
     return *this;

src/Uid.cpp

@@ -40,6 +40,8 @@ Uid::Uid(const PList::Uid& i) : Node(PLIST_UID)
 
 Uid& Uid::operator=(const PList::Uid& i)
 {
+    if (this == &i) return *this;
+
     plist_free(_node);
     _node = plist_copy(i.GetPlist());
     return *this;