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Subject: [boost] [LOG] formatting_ostream API change
From: Andrew Hundt (athundt_at_[hidden])
Date: 2015-11-09 12:20:16

I had the following code, which worked in 1.58:

#include <boost/log/trivial.hpp>

#include <boost/exception/all.hpp>

#include <boost/algorithm/string.hpp>

/// @todo move elsewhere, because it will conflict with others'
implementations of outputting vectors

template<typename T>

inline boost::log::formatting_ostream& operator<<(boost::log::
formatting_ostream& out, std::vector<T>& v)


    out << "[";

    size_t last = v.size() - 1;

    for(size_t i = 0; i < v.size(); ++i) {

        out << v[i];

        if (i != last)

            out << ", ";


    out << "]";

    return out;


I used it to output a std::vector<float> as follows:

 BOOST_LOG_TRIVIAL(trace) << “Real joint angles from FRI: " <<
realJointPosition << "\n";

However this now seems to fail in 1.59. I’ve created a github gist with the
compiler output <> in
case that’s helpful as well. I see that the update recently had some
breaking changes, what is the new way to provide the desired functionality?

Thanks for your help.

Andrew Hundt

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