104             std::get<0>(p).try_put(item);  in operator ()()
113                     std::get<1>(p).try_put(my_bin);  in operator ()()
120                 std::get<0>(p).try_put(desired_bin_capacity + 1); // send out signal  in operator ()()
129                         std::get<0>(p).try_put(my_bin[i]);  in operator ()()
132                     std::get<0>(p).try_put(desired_bin_capacity + 1); // send out signal  in operator ()()
139                         std::get<1>(p).try_put(my_bin);  in operator ()()
140                     std::get<0>(p).try_put(desired_bin_capacity + 1); // send out signal  in operator ()()
153                 std::get<0>(p).try_put(desired_bin_capacity + 1); // send out signal  in operator ()()
156                 std::get<1>(p).try_put(my_bin);  in operator ()()
182                         std::get<0>(p).try_put(my_bin[i]);  in operator ()()
190                     std::get<1>(p).try_put(my_bin);  in operator ()()
196             std::get<0>(p).try_put(item); // put unused item back to pool  in operator ()()