Re: Attn: Maintainer of boost/bind.hpp

From: Niall Douglas (s_sourceforge_at_[hidden])
Date: 2019-12-13 17:41:28

>> In boost/bind.hpp there is injection of a boost namespace contents
>> into the global namespace:
> 
> Including <boost/bind/bind.hpp> doesn't bring the placeholders into the
> global namespace; if you don't want them there, just include
> <boost/bind/bind.hpp>. <boost/bind.hpp> does for backward compatibility.

Unfortunately, some of the Boost libraries include <boost/bind.hpp>, and
thus pollute the global namespace.

>> Please fix this in the next release of Boost.
> 
> Breaking code without any warning is not a good practice, but I'll mark
> <boost/bind.hpp> as deprecated to allow people time to migrate.

Personally speaking, I think the macro `BOOST_BIND_NO_PLACEHOLDERS`
needs to become `BOOST_BIND_ENABLE_GLOBAL_PLACEHOLDERS`. People can
still use <boost/bind.hpp>, but they'll need to explicitly opt into the
old behaviour.

(This will also encourage the maintainers of those libraries depending
on global placeholders to fix their libraries)

Niall