[Boost-bugs] [Boost C++ Libraries] #10864: Boost 1.57 + Xcode 6: function/lamba incompatibility

Subject: [Boost-bugs] [Boost C++ Libraries] #10864: Boost 1.57 + Xcode 6: function/lamba incompatibility
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-12-10 18:24:56

#10864: Boost 1.57 + Xcode 6: function/lamba incompatibility
------------------------------+---------------------------
 Reporter:  nat@…             |      Owner:  no-maintainer
     Type:  Bugs              |     Status:  new
Milestone:  To Be Determined  |  Component:  lambda
  Version:  Boost 1.57.0      |   Severity:  Regression
 Keywords:                    |
------------------------------+---------------------------
 Boost 1.57 and clang 6 (from Xcode 6) reject this program:

 {{{
 #include <iostream>
 #include <boost/lambda/lambda.hpp>
 #include <boost/function.hpp>

 typedef boost::function<void(std::ostream&)> Streamer;

 void out(const Streamer& func)
 {
     func(std::cout);
 }

 int main(int argc, char *argv[])
 {
     out(boost::lambda::_1 << "hi there\n");
     return 0;
 }
 }}}

 Errors start with:

 {{{
 boost/lambda/detail/lambda_traits.hpp:256:58: error: cannot form a
 reference to 'void'
       typename detail::IF<boost::is_function<T>::value, T&, const T>::RET
                                                          ^
 }}}

 This works with Boost 1.55 with clang 6.

 This works with Boost 1.57 with older compilers.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/10864>
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