#include <iostream>
#include <boost/circular_buffer.hpp>

int allocations = 0;

struct AllocCountingObj
{
    AllocCountingObj()
    {
        ++allocations;
    }
    
    AllocCountingObj(const AllocCountingObj&)
    {
        // still increment on copy-construct
        ++allocations;
    }
    
    ~AllocCountingObj()
    {
        --allocations;
    }
};

#define println(a) std::cout << a << std::endl

int main()
{
    {
        const unsigned capacity = 10;
        boost::circular_buffer<AllocCountingObj> buffer;
        buffer.set_capacity(capacity);
        for (unsigned i = 1; i <= capacity * 2; ++i)
        {
            buffer.push_back(AllocCountingObj());
            println("After " << i << " push_backs: " << allocations);
        }
    }
    
    println("After dtor: " << allocations);
}