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Cannot Declare Reference to tf2_msgs::TFMessage

asked 2016-11-02 09:36:16 -0500

ElizabethA gravatar image

Background:

I had a great callback function in a Gazebo plugin. I declared it with

void OnMsg(ConstVector3dPtr &msg)

and subscribed-to by my plugin's Load function with

subscriber = node->Subscribe("~/eb/vel_cmd", &MyPlugin::OnMsg, this);

Problem:

Instead of subscribing to "~/eb/vel_cmd", I'm subscribing to "/tf", so I need to change the message type of the callback (MyPlugin::OnMsg) to tf2_msgs::TFMessage. I followed the convention of the question in the link below to create a constant pointer for a tf2_msgs::TFMessage message.

http://answers.ros.org/question/21481...

Following the positionCb callback declaration in that code, now my callback is declared with:

private: void OnMsg(const tf2_msgs::TFMessage::ConstPtr& &msg)

I'm getting all kinds of compiling errors, but the biggest problem appears to be "Cannot declare reference to tf2_msgs::TFMessage_<std::allocator<void> >::ConstPtr& {aka class boost::shared_ptr<const tf2_msgs::tfmessage_<std::allocator<void="">>&}' (picture below).

Any ideas on what I'm doing incorrectly?

Compiling Errors:

image description

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private: void OnMsg(const tf2_msgs::TFMessage::ConstPtr& &msg) Do you need two ampersands here? Cannot declare reference to ... which is not a typedef or a template type argument I'm no c++ wizard, but it sounds like that might not be a thing you can do because TFMessage doesn't support it?

Robot_Cpak gravatar imageRobot_Cpak ( 2016-11-02 10:16:07 -0500 )edit

Thanks for the idea! It turned out that I was using the wrong kind of subscribing options - I was using the Transport objects/methods to connect to ROS messages, when the two are separate communications channels.

ElizabethA gravatar imageElizabethA ( 2016-11-04 08:51:05 -0500 )edit

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answered 2016-11-04 08:51:59 -0500

ElizabethA gravatar image

My question was answered on the Gazebo forum.

See http://answers.gazebosim.org/question...

I ended up needing to use ROS subscribing methods, as used here: http://gazebosim.org/tutorials?tut=gu...

and here: https://bitbucket.org/osrf/frc_red_te...

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I also had to update my CMakeLists and add SET(CMAKE_CXX_FLAGS "-std=c++11") to get the 'auto' and 'thread' stuff to compile.

ElizabethA gravatar imageElizabethA ( 2016-11-04 09:12:46 -0500 )edit

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Asked: 2016-11-02 09:36:16 -0500

Seen: 163 times

Last updated: Nov 04 '16