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Asked: 2026-05-22T00:15:47+00:00

I’ve been recently writing simple game in C++ with SFML. Here’s my question: In

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I’ve been recently writing simple game in C++ with SFML. Here’s my question:

In SFML library there is a template class Vector2<T> (specifically I’d be using Vector2f). Unfortunately, it doesn’t have any method to rotate itself, so I came with the idea to write one. But as I wrote:

template<typename T> void Vector2<T>::Rotate(float a);

the compiler says that I can’t do things like this:

printable.h:31:53: error: no ‘void sf::Vector2<T>::Rotate(float)’ member function declared in class ‘sf::Vector2<T>’

Is it possible to add custom method like this? Or should I wrap Vector2f into my own class?

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1 Answer

  1. Editorial Team

    What you’re thinking of is called “monkey patching” or categories and is not available in C++. You can derive from that class to add that functionality or create a friend function to implement what you’re trying to do. (Functions defined as friend inside a class definition have access to an object’s internal state)

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