How to Create Generic C Callbacks for Multiple Classes?

C Callback Using Class Member for Multiple Classes

Problem:

In C , how can you create a generic callback function that works with multiple classes, each with its own callback member function?

Solution:

Originally, a static callback method and a pointer to the instance were used, but this approach can be improved. Here are two alternative solutions:

Using C 11 std::function and std::bind:

1. Define an event handler that takes a std::function as an argument:

void addHandler(std::function<void(int)> callback);

2. Bind the callback function to the instance using std::bind:

std::bind(&MyClass::Callback, this, _1)

Using C 11 Lambda Functions:

With lambda functions, you can further simplify the code:

handler->addHandler([](int x) { std::cout << "x is " << x << '\n'; });

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