fifo_open_list.h

#ifndef PROBFD_OPEN_LISTS_FIFO_OPEN_LIST_H
#define PROBFD_OPEN_LISTS_FIFO_OPEN_LIST_H
 
#include "probfd/algorithms/open_list.h"
 
#include <deque>
 
namespace probfd::open_lists {
 
template <typename Action>
class FifoOpenList : public algorithms::OpenList<Action> {
    std::deque<StateID> queue_;
 
public:
    [[nodiscard]]
    bool empty() const override
    {
        return queue_.empty();
    }
 
    [[nodiscard]]
    unsigned size() const override
    {
        return queue_.size();
    }
 
    StateID pop() override
    {
        StateID s = queue_.front();
        queue_.pop_front();
        return s;
    }
 
    void push(StateID state_id) override { queue_.push_back(state_id); }
 
    void clear() override { queue_.clear(); }
};
 
} // namespace probfd::open_lists
 
#endif // PROBFD_OPEN_LISTS_FIFO_OPEN_LIST_H