From: Niall Douglas (s_sourceforge_at_[hidden])
Date: 2019-12-13 16:47:29
In boost/bind.hpp there is injection of a boost namespace contents into
the global namespace:
```c++
#include <boost/bind/bind.hpp>
#ifndef BOOST_BIND_NO_PLACEHOLDERS
#if defined(BOOST_CLANG)
# pragma clang diagnostic push
# if __has_warning("-Wheader-hygiene")
# pragma clang diagnostic ignored "-Wheader-hygiene"
# endif
#endif
using namespace boost::placeholders;
#if defined(BOOST_CLANG)
# pragma clang diagnostic pop
#endif
#endif // #ifndef BOOST_BIND_NO_PLACEHOLDERS
```
The fact that Boost actually disables the relevant compiler warning
makes this particularly insidious.
No modern C++ library should ever do "using namespace" into the global
namespace in its public headers. Please fix this in the next release of
Boost.
Niall