Operator Overloading, Copy and Move Semantics, and the Rule of Three Five Zero

Operator Overloading

class Point {
public:
    int x;
    int y;

    Point(int xValue, int yValue) : x(xValue), y(yValue) {}

    Point operator+(const Point &other) const {
        return Point(x + other.x, y + other.y);
    }
};

Operator overloading can make custom types feel natural, but it should preserve clear meaning. Overloading operators in surprising ways hurts readability.

Copy Constructor and Copy Assignment

When classes manage resources, copying must be designed carefully. Shallow copies can cause double deletion, leaks, or invalid shared ownership if the class owns raw memory or file handles.

Move Semantics

Move semantics allow efficient transfer of resources instead of expensive copying. This is one of the key strengths of modern C++ and a major reason performance-oriented code can remain expressive.

Rule of Three Five Zero

• Rule of Three: if you define destructor, copy constructor, or copy assignment, you often need all three.
• Rule of Five: in modern C++, move constructor and move assignment join that set.
• Rule of Zero: prefer designs where resource-managing standard types handle these details for you.

Design Advice

Whenever possible, use standard library types such as std::vector, std::string, and smart pointers instead of raw ownership. This reduces the need for hand-written special member functions.

Real-World Usage Snapshot

Copy and move behavior matters in containers, large object graphs, game engines, numerical code, message passing, and API design. Understanding these semantics is one of the big differences between casual and strong C++ developers.