What are move constructors in C++?

What are move constructors in C++?

Move constructors are special constructors in C++ that transfer resources from one object to another, rather than copying them.

Can you give me an example of a move constructor?

Sure! Here's a simple example:

class MyClass {
public:
    int* data;
    MyClass(int value) {
        data = new int(value);
    }
    // Move constructor
    MyClass(MyClass&& other) noexcept {
        data = other.data;  // Transfer ownership
        other.data = nullptr; // Leave other in a valid state
    }
};

What happens if I don't implement a move constructor?

If you don't implement a move constructor, the compiler will generate a default copy constructor, which may lead to inefficient copying of resources.

When should I use move constructors?

You should use move constructors when you want to optimize performance by transferring resources instead of copying them, especially with large objects.