add: cpp-programming-ques 06_operator friend 14

Author: webwithaman

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+  "files.associations": {
+    "ostream": "cpp"
+  }
+}

06_operator_overloading_and_friend_function/14_overload_new_del_friend.cpp

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+#include <iostream>
+#include <new>
+
+class Student
+{
+private:
+    int id;
+    std::string name;
+
+public:
+    // Constructor
+    Student(int studentId, const std::string &studentName) : id(studentId), name(studentName)
+    {
+        std::cout << "Constructor called for Student " << id << std::endl;
+    }
+
+    // Destructor
+    ~Student()
+    {
+        std::cout << "Destructor called for Student " << id << std::endl;
+    }
+
+    // Display function
+    void display() const
+    {
+        std::cout << "Student ID: " << id << ", Name: " << name << std::endl;
+    }
+
+    // Friend function to overload new operator
+    friend void *operator new(size_t size);
+
+    // Friend function to overload delete operator
+    friend void operator delete(void *ptr) noexcept;
+
+    // Friend function to overload new operator (nothrow version)
+    friend void *operator new(size_t size, const std::nothrow_t &nothrow_constant) noexcept;
+
+    // Friend function to overload delete operator (nothrow version)
+    friend void operator delete(void *ptr, const std::nothrow_t &nothrow_constant) noexcept;
+};
+
+// Overload new operator using friend function
+void *operator new(size_t size)
+{
+    std::cout << "Custom new operator called with size: " << size << " bytes." << std::endl;
+    return ::operator new(size); // Use global new for memory allocation
+}
+
+// Overload delete operator using friend function
+void operator delete(void *ptr) noexcept
+{
+    std::cout << "Custom delete operator called." << std::endl;
+    ::operator delete(ptr); // Use global delete for memory deallocation
+}
+
+// Overload new operator (nothrow version) using friend function
+void *operator new(size_t size, const std::nothrow_t &nothrow_constant) noexcept
+{
+    std::cout << "Custom new (nothrow) operator called with size: " << size << " bytes." << std::endl;
+    return ::operator new(size, nothrow_constant); // Use global new (nothrow) for memory allocation
+}
+
+// Overload delete operator (nothrow version) using friend function
+void operator delete(void *ptr, const std::nothrow_t &nothrow_constant) noexcept
+{
+    std::cout << "Custom delete (nothrow) operator called." << std::endl;
+    ::operator delete(ptr, nothrow_constant); // Use global delete (nothrow) for memory deallocation
+}
+
+int main()
+{
+    // Create a student using overloaded new operator
+    Student *student1 = new (std::nothrow) Student(1, "John Doe");
+
+    // Display student information
+    student1->display();
+
+    // Delete the student using overloaded delete operator
+    delete student1;
+
+    return 0;
+}