post lecture 2-2

Lecture/Week2/dog.cpp

@@ -24,4 +24,43 @@ Dog::Dog(const Dog& from){
     for(int i = 0; i< this->namelength; i++){
         this->name[i] = from.name[i];
     }
+}
+
+Dog& Dog::operator=(const Dog& rhs){
+    if(&rhs != this){
+        // delete existing memory
+        if(namelength > 0){
+            delete[] this->name;
+        }
+        this->age = rhs.age;
+        this->namelength = rhs.namelength;
+        this->name = new char[namelength];
+        for(int i = 0; i < namelength; i++){
+            this->name[i] = rhs.name[i];
+        }
+    }
+    return *this;
+}
+
+char Dog::operator[](int index) const{
+    if(index >= namelength){
+        // Use with try/catch when called in main do exception e.what()
+        throw(out_of_range("index is larger than name length"));
+    }
+    return name[index];
+}
+
+char& Dog::operator[](int index){
+    if(index >= namelength){
+        // Use with try/catch when called in main do exception e.what()
+        throw(out_of_range("index is larger than name length"));
+    }
+    return name[index];
+}
+
+ostream& operator<<(ostream& os, const Dog& d){
+    for(int i = 0; i< d.namelength; i++) {
+        os << d[i];
+    }
+    return os;
 }

Lecture/Week2/dog.h

@@ -2,9 +2,15 @@ using namespace std;
 
 class Dog {
     public:
-        Dog(int age, int namelength, char * name);
-        ~Dog();
-        int age;
-        int namelength;
-        char * name;
+    Dog(int age, int namelength, char * name);
+    Dog(const Dog& from);
+    ~Dog();
+    Dog& operator=(const Dog& rhs);
+    char operator[](int index) const;
+    char& operator[](int index);
+    friend ostream& operator<<(ostream& os, const Dog& d);
+    private:
+    int age;
+    int namelength;
+    char * name;
 };