c++ - "No matching functions to call to"发生在 C++ 中的构造函数中

Question

这是我在程序中遇到的 C++ 构造函数问题。

问题出现在这里，程序中没有检测到cyclical_的构造函数。这里

pcl::gpu::kinfuLS::KinfuTracker::KinfuTracker 
(   const Eigen::Vector3f &volume_size, const float shiftingDistance, 
    int rows, int cols) : 
    //
    // error lies here, no matching function for cyclical_()
    //
        cyclical_( DISTANCE_THRESHOLD, VOLUME_SIZE, VOLUME_X ),  
        rows_(rows), cols_(cols), global_time_(0), max_icp_distance_(0), 
        integration_metric_threshold_(0.f), 
        perform_last_scan_ (false), finished_(false), lost_ (false), 
        disable_icp_ (false), perform_segmentation_(false)
{
  ....
}

cyclical_ 类已明确定义和引用。它定义如下。完整的原始完整在这里。 https://github.com/lvzhaoyang/pcl/blob/master/gpu/kinfu_large_scale/include/pcl/gpu/kinfu_large_scale/kinfu.h我在我的程序中添加了一些参数，但我没有更改与 CyclicalBuffer 相关的任何内容。

CyclicalBuffer cyclical_;
CyclicalBuffer object_cyclical_; // another member of type CyclicalBuffer, but the error shows the former one, not this one. Someone say it might affect.
enum { VOLUME_X = 512, VOLUME_Y = 512, VOLUME_Z = 512 };
const float VOLUME_SIZE = 3.0f;
const float DISTANCE_THRESHOLD = 1.5f;

而CyclicalBuffer类的定义如下。原来的在这里:https://github.com/lvzhaoyang/pcl/blob/master/gpu/kinfu_large_scale/include/pcl/gpu/kinfu_large_scale/cyclical_buffer.h这部分我什么都没改。

namespace pcl
{
namespace gpu
{
namespace kinfuLS
{ 
  class PCL_EXPORTS CyclicalBuffer
  {
    public:

      CyclicalBuffer (const double distance_threshold, const double cube_size = 3.f, const int nb_voxels_per_axis = 512)
      {
        distance_threshold_ = distance_threshold;
        buffer_.volume_size.x = cube_size; 
        buffer_.volume_size.y = cube_size; 
        buffer_.volume_size.z = cube_size;
        buffer_.voxels_size.x = nb_voxels_per_axis; 
        buffer_.voxels_size.y = nb_voxels_per_axis; 
        buffer_.voxels_size.z = nb_voxels_per_axis; 
      }

      CyclicalBuffer (const double distance_threshold, const double volume_size_x, const double volume_size_y, const double volume_size_z, const int nb_voxels_x, const int nb_voxels_y, const int nb_voxels_z)
      {
        distance_threshold_ = distance_threshold;
        buffer_.volume_size.x = volume_size_x; 
        buffer_.volume_size.y = volume_size_y; 
        buffer_.volume_size.z = volume_size_z;
        buffer_.voxels_size.x = nb_voxels_x; 
        buffer_.voxels_size.y = nb_voxels_y; 
        buffer_.voxels_size.z = nb_voxels_z; 
      }

  ...

}
}
};

但是当我编译问题时，它给出了这样的错误:

/home/lv/pcl-trunk/gpu/kinfu_large_scale/src/kinfu.cpp: In constructor ‘pcl::gpu::kinfuLS::KinfuTracker::KinfuTracker(const Vector3f&, float, int, int)’:
/home/lv/pcl-trunk/gpu/kinfu_large_scale/src/kinfu.cpp:85:53: error: no matching function for call to ‘pcl::gpu::kinfuLS::CyclicalBuffer::CyclicalBuffer()’
/home/lv/pcl-trunk/gpu/kinfu_large_scale/src/kinfu.cpp:85:53: note: candidates are:
/home/lv/pcl-trunk/gpu/kinfu_large_scale/include/pcl/gpu/kinfu_large_scale/cyclical_buffer.h:96:11: note: pcl::gpu::kinfuLS::CyclicalBuffer::CyclicalBuffer(double, double, double, double, int, int, int)
/home/lv/pcl-trunk/gpu/kinfu_large_scale/include/pcl/gpu/kinfu_large_scale/cyclical_buffer.h:96:11: note:   candidate expects 7 arguments, 0 provided
/home/lv/pcl-trunk/gpu/kinfu_large_scale/include/pcl/gpu/kinfu_large_scale/cyclical_buffer.h:75:11: note: pcl::gpu::kinfuLS::CyclicalBuffer::CyclicalBuffer(double, double, int)
/home/lv/pcl-trunk/gpu/kinfu_large_scale/include/pcl/gpu/kinfu_large_scale/cyclical_buffer.h:75:11: note:   candidate expects 3 arguments, 0 provided
/home/lv/pcl-trunk/gpu/kinfu_large_scale/include/pcl/gpu/kinfu_large_scale/cyclical_buffer.h:65:25: note: pcl::gpu::kinfuLS::CyclicalBuffer::CyclicalBuffer(const pcl::gpu::kinfuLS::CyclicalBuffer&)
/home/lv/pcl-trunk/gpu/kinfu_large_scale/include/pcl/gpu/kinfu_large_scale/cyclical_buffer.h:65:25: note:   candidate expects 1 argument, 0 provided

我不太明白候选人需要 3 个参数，但提供了 0 个 的错误。我想我已经提供了正确数量的论点，并且所有内容都被清楚地引用了。

感谢您讨论我的问题。我想我找到了一些线索，但我不知道为什么。问题可能在于类型 CyclicalBuffer 的第二个成员。

CyclicalBuffer cyclical_;
CyclicalBuffer object_cyclical_; // when I comment everything related to this. The error disappears.

看起来很奇怪。我不知道第二个成员如何对第一个成员给出错误。如果是object_cyclical_没有正确构造的问题，为什么会在cyclical_上报错呢？为了确保，错误报告第 85 行是 cyclical_( DISTANCE_THRESHOLD, VOLUME_SIZE, VOLUME_X )

谁能帮我指出潜在的问题所在？

Answer 1

将所有东西拼凑在一起，我想你得到的是这个(通过暂时省略一些命名空间位来简化):

class KinfuTracker
{ // ....
  CyclicalBuffer cyclical_;
  CyclicalBuffer object_cyclical_;
  // ....
};

KinfuTracker::KinfuTracker(/*arguments left out for simplicity*/) : 
   cyclical_( DISTANCE_THRESHOLD, VOLUME_SIZE, VOLUME_X ),
   /* other member constructor/initializer bits */
{ // ......
}

我认为引起您问题的不是 cyclical_，而是 object_cyclical_。 object_cyclical_ 没有出现在构造函数/初始化器列表中，因此它是通过您尚未实现的默认构造函数构造的。

要么为 CyclicalBuffer 提供默认构造函数，设置合理的默认值，要么在您的 KinfoTracker 类中显式构造 object_cyclical_ 成员。