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Use ROS_ macro to output std::vector data

asked 2015-04-03 16:40:54 -0500

alextoind gravatar image

If I'm dealing with std::vector data in C++ and I'd like to print it on the output stream (e.g. for debugging), I'm going to do something like this:

std::cout << "Data Retrieved: \n";
std::copy(data.begin(), data.end(), std::ostream_iterator<double>(std::cout, " "));
std::cout << std::endl;

How to reproduce this behaviour using (for example) ROS_DEBUG_STREAM() macro? I wish to include logger level also in the output of vector data.

The only way I found to achieve this result is something as follows:

log4cxx::LoggerPtr logger = log4cxx::Logger::getLogger(ROSCONSOLE_DEFAULT_NAME);
if (logger && logger->getLevel() == log4cxx::Level::getDebug()) {
  // debugging code
  std::cout << "Data Retrieved: \n";
  std::copy(data.begin(), data.end(), std::ostream_iterator<double>(std::cout, " "));
  std::cout << std::endl;

In which case I need to link the proper library:

find_library(LOG4CXX_LIBRARY log4cxx)
target_link_libraries(some_target ${LOG4CXX_LIBRARY})

(I found these useful info here)

Someone knows if there is a better way? Thank you!

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1 Answer

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answered 2015-04-05 15:26:47 -0500

tfoote gravatar image

A typical solution is to create a std::stringstream object and build the output in a for loop. If you want this to be done conditionally make a function that does this and use it inside the ROS_DEBUG_STREAM call so it will be conditionally evaluated.

Note: Your solution is does not achieve the same result, It only goes to console. The rosconsole macros can go to both console as well as rosout.

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Thank you, I didn't think about that! Now works as expected.

alextoind gravatar image alextoind  ( 2015-04-06 15:11:25 -0500 )edit

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Asked: 2015-04-03 16:40:54 -0500

Seen: 1,910 times

Last updated: Apr 05 '15