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_