Executor

Some APIs of Executors:

template <typename InputFormatT, typename ParseT>
void load(InputFormatT& infmt, const ParseT& parse);

template <typename InputFormatT, typename ParseT>
void load(InputFormatT& infmt, const std::vector<ChannelBase*>& out_channel, const ParseT& parse);

template <typename ObjT>
void globalize(ObjList<ObjT>& obj_list);

template <typename ObjT, typename ExecT>
void list_execute(ObjList<ObjT>& obj_list, ExecT execute, int num_iters = 1);

template <typename ObjT, typename ExecT>
void list_execute(ObjList<ObjT>& obj_list, const std::vector<ChannelBase*>& in_channel,
                  const std::vector<ChannelBase*>& out_channel, ExecT execute, int num_iters = 1);

Some usages:

load(infmt, parse_wc);
list_execute(word_list, [&ch](Word& word) { ... });

load(infmt, {&ch}, parse_wc);
list_execute(word_list, {&ch}, {},
    [&ch](Word& word) { ... });