如何使用lambda替换std::bind

Question

auto dis_calculator =
        std::bind(&LaneTrackerImpl::calc_lane_distance, this,
                  std::placeholders::_1, std::placeholders::_2, false, 0.0f,
                  std::placeholders::_3, std::placeholders::_4,
                  std::placeholders::_5, std::placeholders::_6);

我像这样写代码：

 auto lane_distance_calculator = [this](const Lane &lane1, const Lane &lane2,
                          bool disable_lane_start_distance_affection,
                          bool disable_lane_end_distance_affection,
                          DistanceMethod method, bool is_matching_phase)
{
    this->calc_lane_distance(
        lane1, lane2, false, 0.0f,
        disable_lane_start_distance_affection,
        disable_lane_end_distance_affection,
        method, is_matching_phase);
};

func merge_lanes使用它：

merge_lanes(prob_thresh_list_, detected_lanes.lanes, tracked_lanes.lanes,
            result.lanes, next_track_id, detection_score_threshold_,
            lane_distance_calculator); 

错误：

 error: no matching function for call to ‘{anonymous}::LaneTrackerImpl::merge_lanes(std::vector<float, std::allocator<float> >&, std::vector<perception::Lane>&, std::vector<perception::Lane>&, std::vector<perception::Lane>&, size_t&, float&, {anonymous}::LaneTrackerImpl::merge(perception::LanePrediction&, perception::LanePrediction&, size_t)::<lambda(const perception::Lane&, const perception::Lane&, bool, bool, {anonymous}::LaneTrackerImpl::DistanceMethod, bool)>&)’
             lane_distance_calculator);

我该怎么解决它呢？这让我困惑了很长时间。

Answer 1

你已经很接近了。试着这样做：

auto dis_calculator = [this](const Lane &lane1, const Lane &lane2,
                              bool disable_lane_start_distance_affection,
                              bool disable_lane_end_distance_affection,
                              DistanceMethod method, bool is_matching_phase)
{
    this->calc_lane_distance(
        lane1, lane2, false, 0.0f,
        disable_lane_start_distance_affection,
        disable_lane_end_distance_affection,
        method, is_matching_phase);
};