boost.log version 1.59 stream operator failure for user types

[Marios Visvardis <visvardis.marios@…>]

The following code works as expected with boost 1.57, but fails with boost 1.59:

#include <iostream> #include <boost/log/trivial.hpp>

struct Foo {

int d=1;

};

std::ostream& operator<<(std::ostream& out, const Foo& foo) {

out << "Foo: " << foo.d; return out;

}

int main() {

BOOST_LOG_TRIVIAL(info) << Foo(); return EXIT_SUCCESS;

}

I have also started a discussion in SO:

​http://stackoverflow.com/questions/32185858/problems-with-boost-log-version-1-59/32187641#32187641

and a workaround is suggested.

[Andrey Semashev]

Duplicates #11549.