loop_util.h

[詳解]

 
 
// Copyright(c) 2023-2025 Design Engineering Laboratory, Saitama University
// Released under the MIT license
// https://opensource.org/licenses/mit-license.php
 
#ifndef DESIGNLAB_LOOP_UTIL_H_
#define DESIGNLAB_LOOP_UTIL_H_
 
#include <tuple>
 
namespace designlab {
 
class DoubleIntRange final {
 public:
  class Iterator final {
   private:
    int i;
    int j;
    int j_max;
 
   public:
    Iterator(int i, int j, int j_max) : i(i), j(j), j_max(j_max) {}
 
    std::tuple<int, int> operator*() const { return std::make_tuple(i, j); }
 
    Iterator& operator++() {
      ++j;
 
      if (j == j_max) {
        ++i;
        j = 0;
      }
 
      return *this;
    }
 
    bool operator!=(const Iterator& other) const {
      return i != other.i || j != other.j;
    }
  };
 
  DoubleIntRange(const int i_max, const int j_max)
      : i_max_(i_max), j_max_(j_max) {}
 
  Iterator begin() const { return Iterator(0, 0, j_max_); }
 
  Iterator end() const { return Iterator(i_max_, 0, j_max_); }
 
 private:
  int i_max_;
  int j_max_;
};
 
}  // namespace designlab
 
#endif  // DESIGNLAB_LOOP_UTIL_H_