Andrey Semashev wrote:
Hello,
I'd like to ask if it is possible to make Boost.Lambda place holders _1, _2 and _3 compatible with Boost.Bind?
The reason I ask is that I often use both these libraries which makes it impossible to import lambda's namespace into global and forces me to use some shorthand namespace aliases, like bll or lambda. On the other hand, as a user I don't see much difference between ::_1 and boost::lambda::_1. I think, if lambda used bind's placeholders it would gain usability.
If there are no technical reasons not to, I agree this would be nice. And IMO they should be Proto terminals, so that libraries like Spirit and xpressive can use them seamlessly. template<typename I> placeholder { typedef I type }; proto::terminal<placeholder<mpl::int_<0> > >::type const _1 = {{}}; proto::terminal<placeholder<mpl::int_<1> > >::type const _2 = {{}}; ... I'm not sure how well legacy compilers will fare with Proto, though. FWIW, the lambda library is to be replaced with Joel de Guzman's Phoenix library, and there is a nascent effort to port Phoenix to Proto. (I'm leaving today for a week-long vacation. I'll be on email only off and on.) -- Eric Niebler Boost Consulting www.boost-consulting.com