Hello, I'm new to circular_buffer. After reading the documentation i expect the following should work: const int c = 5; boost::circular_buffer<int> cb1(c); assert(cb1.capacity() == c); boost::circular_buffer<int> cb2(cb1); assert(cb2.capacity() == c); //failed, capacity() returns 0 But it does'nt work. After looking into the code of circular_buffer, i think the copy c'tor should be changed into something like this: circular_buffer(const circular_buffer<T, Alloc>& cb) : m_size(cb.size()), m_alloc(cb.get_allocator()) { initialize(cb.capacity()); BOOST_TRY { cb_details::uninitialized_copy(cb.begin(), cb.end(), m_buff, m_alloc); } BOOST_CATCH(...) { deallocate(m_buff, cb.capacity()); BOOST_RETHROW } BOOST_CATCH_END } Or do i missunderstand the documentation? I'm using vs2003 and the latest version of circular_buffer from boost-sandbox in ordinary debug mode. Thanks. Andreas Rose