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How to pipe into std::cout with boost::iostreams

I am new to boost::iostreams so this might be trivial:

Assuming namespace io = boost::iostreams;

this works

io::filtering_ostream out(std::cout);
out << "some\nstring\n";

and this works

std::string result;
io::filtering_ostream out(io::counter() | io::back_inserter(result));
out << "some\nstring\n";

yet this does not compile

io::filtering_ostream out(io::counter() | std::cout);
out << "some\nstring\n";

How do you pipe into std::cout?

Solution

  • Wrapping std::cout with boost::ref worked for me:

    io::filtering_ostream out(DummyOutputFilter() | boost::ref(std::cout));

    See note_1 in pipable docs for details.