Input tuples with index
(Mylib/IO/input_tuples_with_index.cpp)

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• Last update: 2021-04-23 23:44:44+09:00
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Operations

Requirements

Notes

Problems

References

Depends on

• Input tuple (Mylib/IO/input_tuple.cpp)

Verified with

• test/aoj/1508/main.splay_tree.test.cpp
• test/aoj/1508/main.treap.test.cpp
• test/aoj/2136/main.test.cpp
• test/aoj/DSL_2_C/main.test.cpp
• test/aoj/GRL_5_C/main.doubling.test.cpp
• test/aoj/GRL_5_C/main.hld.test.cpp
• test/yosupo-judge/dynamic_tree_vertex_add_path_sum/main.link_cut_tree.test.cpp
• test/yosupo-judge/persistent_unionfind/main.test.cpp
• test/yosupo-judge/point_set_range_composite/main.test.cpp
• test/yukicoder/875/main.test.cpp

Code

#pragma once
#include <initializer_list>
#include <iostream>
#include <tuple>
#include <utility>
#include <vector>
#include "Mylib/IO/input_tuple.cpp"

namespace haar_lib {
  template <typename... Args>
  class InputTuplesWithIndex {
    struct iter {
      using value_type = std::tuple<int, Args...>;
      value_type value;
      bool fetched = false;
      int N;
      int c = 0;

      value_type operator*() {
        if (not fetched) {
          std::tuple<Args...> temp;
          std::cin >> temp;
          value = std::tuple_cat(std::make_tuple(c), temp);
        }
        return value;
      }

      void operator++() {
        ++c;
        fetched = false;
      }

      bool operator!=(iter &) const {
        return c < N;
      }

      iter(int N) : N(N) {}
    };

    int N;

  public:
    InputTuplesWithIndex(int N) : N(N) {}

    iter begin() const { return iter(N); }
    iter end() const { return iter(N); }
  };

  template <typename... Args>
  auto input_tuples_with_index(int N) {
    return InputTuplesWithIndex<Args...>(N);
  }
}  // namespace haar_lib

#line 2 "Mylib/IO/input_tuples_with_index.cpp"
#include <initializer_list>
#include <iostream>
#include <tuple>
#include <utility>
#include <vector>
#line 6 "Mylib/IO/input_tuple.cpp"

namespace haar_lib {
  template <typename T, size_t... I>
  static void input_tuple_helper(std::istream &s, T &val, std::index_sequence<I...>) {
    (void) std::initializer_list<int>{(void(s >> std::get<I>(val)), 0)...};
  }

  template <typename T, typename U>
  std::istream &operator>>(std::istream &s, std::pair<T, U> &value) {
    s >> value.first >> value.second;
    return s;
  }

  template <typename... Args>
  std::istream &operator>>(std::istream &s, std::tuple<Args...> &value) {
    input_tuple_helper(s, value, std::make_index_sequence<sizeof...(Args)>());
    return s;
  }
}  // namespace haar_lib
#line 8 "Mylib/IO/input_tuples_with_index.cpp"

namespace haar_lib {
  template <typename... Args>
  class InputTuplesWithIndex {
    struct iter {
      using value_type = std::tuple<int, Args...>;
      value_type value;
      bool fetched = false;
      int N;
      int c = 0;

      value_type operator*() {
        if (not fetched) {
          std::tuple<Args...> temp;
          std::cin >> temp;
          value = std::tuple_cat(std::make_tuple(c), temp);
        }
        return value;
      }

      void operator++() {
        ++c;
        fetched = false;
      }

      bool operator!=(iter &) const {
        return c < N;
      }

      iter(int N) : N(N) {}
    };

    int N;

  public:
    InputTuplesWithIndex(int N) : N(N) {}

    iter begin() const { return iter(N); }
    iter end() const { return iter(N); }
  };

  template <typename... Args>
  auto input_tuples_with_index(int N) {
    return InputTuplesWithIndex<Args...>(N);
  }
}  // namespace haar_lib

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