cmd_option_bind_param_list.h

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#ifndef UTIL_CLI_CMDOPTIONBINDPARAMLIST_H
#define UTIL_CLI_CMDOPTIONBINDPARAMLIST_H
 
#pragma once
 
/*
 * cmd_option_bind_param_list.h
 *
 *  Created on: 2014-01-22
 *      Author: OWenT
 *
 * 绑定器参数列表类
 */
 
#include "cli/cmd_option_bindt_cc.h"
#include "cli/cmd_option_bindt_mf_cc.h"
#include "cli/cmd_option_list.h"
 
#include <tuple>
 
namespace util {
namespace cli {
namespace binder {
 
template <typename _Tp>
struct maybe_wrap_member_pointer {
  typedef _Tp type;
  typedef cmd_option_bindt_cc_caller<_Tp> caller_type;
 
  static const _Tp &do_wrap(const _Tp &__x) { return __x; }
 
  static _Tp &do_wrap(_Tp &__x) { return __x; }
};
 
template <typename _Tp, typename _Class>
struct maybe_wrap_member_pointer<_Tp _Class::*> {
  typedef _Tp _Class::*type;
  typedef cmd_option_bindt_mf_cc_caller<_Class, type> caller_type;
 
  static type do_wrap(_Tp _Class::*__pm) { return type(__pm); }
};
 
// ============================
// ===       参数列表       ===
// ============================
template <typename... _Args>
class cmd_option_bind_param_list {
 private:
  template <int... _Index>
  struct index_args_var_list {};
 
  template <std::size_t N, int... _Index>
  struct build_args_index : build_args_index<N - 1, _Index..., sizeof...(_Index)> {};
 
  template <int... _Index>
  struct build_args_index<0, _Index...> {
    typedef index_args_var_list<_Index...> type;
  };
 
 private:
  template <class _F, int... _Indexes>
  void _do_call(_F &f, callback_param args, index_args_var_list<_Indexes...>) {
    f(args, std::get<_Indexes>(args_)...);
  }
 
 private:
  std::tuple<_Args...> args_;
 
 public:
  cmd_option_bind_param_list(_Args... args) : args_(args...) {}
 
  template <class _F>
  void operator()(_F &f, callback_param args, int) {
    typedef typename build_args_index<sizeof...(_Args)>::type _index_type;
    _do_call(f, args, _index_type());
  }
};
 
}  // namespace binder
}  // namespace cli
}  // namespace util
#endif /* _CMDOPTIONBINDPARAMLIST_H_ */