arkin's profile - activity

Good explanation, and thanks!

Hi all, I am trying to use tf2_ros::Buffer in a simple code. When I put it in the main function, everything works fine. But when put in a class, building error occurs. The code is like this:

#include <ros/ros.h>
#include <tf2_ros/buffer.h>
#include <tf2_ros/transform_listener.h>
#include <geometry_msgs/TransformStamped.h>
#include <geometry_msgs/Twist.h>

class test_class

{
private:
    double start;
    double duration;
    ros::Time start_time;
    ros::Time end_time;
    std::string robot_name;

    tf2_ros::Buffer tf_buffer; // problem
    tf2_ros::TransformListener* tfListener;
    geometry_msgs::TransformStamped transformStamped;

public:
    std::string space_name;
    std::string node_name;

    test_class()
    {
        space_name = ros::this_node::getNamespace();
        node_name = ros::this_node::getName();
    }

    ~test_class()
    {}

    bool initialize(const ros::NodeHandle& n)
    {
        ROS_INFO("Class auto_mav_flight initialized done!");
        return true;
    }
    void timer_callback(const ros::TimerEvent& event)
    {
        ROS_INFO("Timer Callback triggered.");
        return;
    }
}; 

int main(int argc, char** argv)
{
    ros::init(argc, argv, "auto_mav_node");
    ros::NodeHandle node;
    ROS_WARN("The node is initilized and started.");
    test_class amf = test_class();
    amf.initialize(node);
    ros::Timer timer_1 = node.createTimer(ros::Duration(0.5), &test_class::timer_callback, &amf);
    ros::spin();
    return EXIT_SUCCESS;
}

and the building error information is:

/home/arkin/ros_code/sandbox/auto_mav_sandbox/src/auto_mav_flight/src/node_main.cpp: In function ‘int main(int, char**)’:
/home/arkin/ros_code/sandbox/auto_mav_sandbox/src/auto_mav_flight/src/node_main.cpp:73:44: error: no matching function for call to ‘test_class::test_class(test_class)’
  test_class amf = test_class();
                                            ^
/home/arkin/ros_code/sandbox/auto_mav_sandbox/src/auto_mav_flight/src/node_main.cpp:73:44: note: candidates are:
/home/arkin/ros_code/sandbox/auto_mav_sandbox/src/auto_mav_flight/src/node_main.cpp:26:2: note: test_class::test_class()
  test_class()
  ^
/home/arkin/ros_code/sandbox/auto_mav_sandbox/src/auto_mav_flight/src/node_main.cpp:26:2: note:   candidate expects 0 arguments, 1 provided
/home/arkin/ros_code/sandbox/auto_mav_sandbox/src/auto_mav_flight/src/node_main.cpp:9:7: note: test_class::test_class(test_class&)
 class test_class
       ^
/home/arkin/ros_code/sandbox/auto_mav_sandbox/src/auto_mav_flight/src/node_main.cpp:9:7: note:   no known conversion for argument 1 from ‘test_class’ to ‘test_class&’
make[2]: *** [auto_mav_flight/CMakeFiles/auto_mav_flight_node.dir/src/node_main.cpp.o] Error 1
make[1]: *** [auto_mav_flight/CMakeFiles/auto_mav_flight_node.dir/all] Error 2
make: *** [all] Error 2

I found that if I comment the code line:

 tf2_ros::Buffer tf_buffer;

the error disappear.

Why the tf2_ros::Buffer can cause problem of class construction even I just declare it as a member of class?

Any help will be appreciated.

Thanks in advance.

For reference: https://stackoverflow.com/questions/46662748/building-error-when-declare-tf2-rosbuffer-in-class From tf2

Sure, Thank you. :-)

For reference: https://stackoverflow.com/questions/46662748/building-error-when-declare-tf2-rosbuffer-in-class

class construction error when using tf2_ros::Buffer Hi all, I am trying to use tf2_ros::Buffer in a simple code. When I

class construction error when using tf2_ros::Buffer Hi all, I am trying to use tf2_ros::Buffer in a simple code. When I

class construction error when using tf2_ros::Buffer Hi all, I am trying to use tf2_ros::Buffer in a simple code. When I

class construction error when using tf2_ros::Buffer Hi all, I am trying to use tf2_ros::Buffer in a simple code as follo

class construction error when using tf2_ros::Buffer Hi all, I am trying to use tf2_ros::Buffer in a simple code as follo

class construction error when using tf2_ros::Buffer Hi all, I am trying to use tf2_ros::Buffer in a simple code as follo

class construction error when using tf2_ros::Buffer Hi all, I am trying to use tf2_ros::Buffer in a simple code as follo

I don't know how to make the code typed in a console showed in a cell. How to make it? It makes the text very easy to read.

when I tried to install ROS in a 64-bit Ubuntu, some problems occurred.

arkin@arkin-OptiPlex-790:~$ sudo apt-get install ros-indigo-desktop-full 

Reading package lists... Done

Building dependency tree     

Reading state information... Done

Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:

 ros-indigo-desktop-full:i386 : 

Depends: ros-indigo-desktop:i386 but it is not going to be installed

Depends: ros-indigo-perception:i386 but it is not going to be installed

Depends: ros-indigo-simulators:i386 but it is not going to be installed

E: Unable to correct problems, you have held broken packages.

===============================================

What is the problem? How to solve it?

Also I tried in Synaptic. I typed "ros-indigo-desktop" in the filter and the results are:

ros-indigo-rosh-desktop: i386

ros-indigo-rosh-desktop-plugins: i386

ros-indigo-desktop-full: i386

ros-indigo-desktop: i386

why they all have an suffix "i386"? (my OS is Ubuntu-14.04-AMD64)

But if I search it in terminal, it shows that:

arkin@arkin-OptiPlex-790:~$ sudo apt-cache search ros-indigo-desktop

[sudo] password for arkin: 

ros-indigo-desktop - A metapackage to aggregate several packages.

ros-indigo-desktop-full - A metapackage to aggregate several packages.

Does the ROS have 64bits version and 32bits version respectively?

How to install a 64-bit version of ROS correctly in a AMD64 version of Ubuntu 14.04 trusty?

Thank you!

I just tried to install the ROS indigo following the tips on the ROS website http://wiki.ros.org/indigo/Installati... . But how to let the apt-get download a AMD64 version ROS? Is there ROS indigo 64bits and 32bits respectively?