Re: [Boost-bugs] [Boost C++ Libraries] #9953: lazy_enable_if is not sfinae friendly

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #9953: lazy_enable_if is not sfinae friendly
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-04-25 10:57:13

#9953: lazy_enable_if is not sfinae friendly
-------------------------------+---------------------------
  Reporter:  hui.li@…          |      Owner:  no-maintainer
      Type:  Feature Requests  |     Status:  new
 Milestone:  To Be Determined  |  Component:  utility
   Version:  Boost 1.55.0      |   Severity:  Problem
Resolution:                    |   Keywords:
-------------------------------+---------------------------

Comment (by anonymous):

 I should mention what error i get when compiling the test code.
 On clang++-3.4 with -std=c++11, I got:
 {{{
 clang++-mp-3.4 -std=c++11 -I /opt/local/include/ main.cpp
 In file included from main.cpp:1:
 In file included from /opt/local/include/boost/type_traits.hpp:65:
 In file included from
 /opt/local/include/boost/type_traits/is_nothrow_move_assignable.hpp:22:
 /opt/local/include/boost/utility/enable_if.hpp:40:25: error: no type named
 'type' in 'boost::result_of<A (int)>'
    typedef typename T::type type;
            ~~~~~~~~~~~~^~~~
 main.cpp:12:1: note: in instantiation of template class
 'boost::lazy_enable_if_c<true, boost::result_of<A (int)> >'
      requested here
 typename boost::lazy_enable_if_c<
 ^
 main.cpp:16:1: note: while substituting explicitly-specified template
 arguments into function template 'test'
 test(int){}
 ^
 1 error generated.
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/9953#comment:1>
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