Our project is using BOOST_BIND_NO_PLACEHOLDERS because of frequent clashes with C++11 placeholders. When including cpp-netlib headers (boost/network/protocol/http/client.hpp), the project doesn't compile because the code expects placeholders to be accessible without qualifiers.

An example error looks as follows:

deps/cpp-netlib/cpp-netlibBuild-prefix/include/boost/network/protocol/http/policies/async_connection.hpp:83:39: error: ‘_4’ was not declared in this scope
                     this, _1, _2, _3, _4),
                                       ^

Because BOOST_BIND_NO_PLACEHOLDERS, boost::arg<N>(), boost::is_placeholder are undocumented (as per this thread on Boost mailing list) I'm not sure what would be the best way to solve the problem on cpp-netlib's side.

One workaround on our project's side is to pull std::placeholders into the global namespace before including cpp-netlib headers. (This works as long as you're not using any cpp-netlib functions.) Of course, one other approach would be to undefine BOOST_BIND_NO_PLACEHOLDERS and always qualify std::placeholders.