protected CefUserData() { _self = cef_user_data_t.Alloc(); _ds0 = new cef_user_data_t.add_ref_delegate(add_ref); _self->_base._add_ref = Marshal.GetFunctionPointerForDelegate(_ds0); _ds1 = new cef_user_data_t.release_delegate(release); _self->_base._release = Marshal.GetFunctionPointerForDelegate(_ds1); _ds2 = new cef_user_data_t.get_refct_delegate(get_refct); _self->_base._get_refct = Marshal.GetFunctionPointerForDelegate(_ds2); }