错误:没有名为'value_type'const pcl::PointCloud<pcl::PointX
error: no type named 'value_type' in 'class boost::shared_ptr<const pcl::PointCloud<pcl::PointXYZ> >'
我有一些代码看起来像这样:
typedef pcl::PointXYZRGB pcl_ColorPointType;
typedef pcl::PointXYZ pcl_PointType;
typedef pcl::PointCloud<pcl_PointType> pcl_XYZPointCloudType;
typedef pcl::PointCloud<pcl_ColorPointType> pcl_ColorPointCloudType;
typedef pcl_XYZPointCloudType::Ptr pcl_XYZPointCloudPtrType;
typedef pcl_ColorPointCloudType::Ptr pcl_ColorPointCloudPtrType;
void
BuildMeshFromDepthImage()
{
pcl_XYZPointCloudConstPtrType pointCloud = BuildPurePointCloudFromDepthImage( ); // assume BuildPurePointCloudFromDepthImage function exists
BuildMeshFromPointCloud<pcl_XYZPointCloudConstPtrType>( pointCloud );
}
template<typename T_pclPtr>
void BuildMeshFromPointCloud(const T_pclPtr &pointCloud )
{
// some code
// error: no type named 'value_type'
const typename T_pclPtr::value_type::PointType& pt = pointCloud->points[i];
// some code
}
知道为什么这不起作用吗?注:此代码适用于VS2010,但不适用于GCC4.9。这可能是因为不同版本的PCL库吗?
From pcl::PointCloud<类模板引用>类模板引用>
typedef boost::shared_ptr< PointCloud< PointT > > Ptr
和提升。SharedPtr
element_type当T不是数组类型时为T,当T为U[]或U[N]时为U。
这就是你需要的:
typename T_pclPtr::element_type::PointType& t= pointCloud->points[i];
对于c++ 11或更高版本,可以这样使用:
auto t= pointCloud->points[i];