Question

I like Boost Templated Circular Buffer Container, but how to get when it was filled 100%?

   #include <boost/circular_buffer.hpp>

   int main() {

      // Create a circular buffer with a capacity for 3 integers.
      boost::circular_buffer<int> cb(3);

      // Insert some elements into the buffer.
      cb.push_back(1);
      cb.push_back(2);
      cb.push_back(3);

      // Here I want some function to be called (for example one that would cout all buffer contents)

      int a = cb[0];  // a == 1
      int b = cb[1];  // b == 2
      int c = cb[2];  // c == 3

      return 0;
   }

So how to listen for such event in boost::circular_buffer and for example cout all buffer contents?

Answer 1

You can wrap the circular_buffer instance into its own class and implement event handling on top of it.

class MyCircularBuffer
{
public:
    MyCircularBuffer() : buffer(3) {}

    void PushBack(int i)
    {
        buffer.push_back(i);
        if(buffer.size() == 3)
        {
            // buffer is full!
        }
    }
private:
    boost::circular_buffer<int> buffer;
};

If code outside of MyCircularBuffer needs to be notified of the event, you can implement some variant of the Observer pattern, use Boost.Function or use some other callback mechanism.