Re: [Boost-bugs] [Boost C++ Libraries] #10125: call_once: compile errors in variadic version with rvalue reference emulation

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #10125: call_once: compile errors in variadic version with rvalue reference emulation
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-06-16 21:17:03

#10125: call_once: compile errors in variadic version with rvalue reference
emulation
-------------------------------+----------------------
  Reporter:  raad@…            |      Owner:  viboes
      Type:  Bugs              |     Status:  assigned
 Milestone:  To Be Determined  |  Component:  thread
   Version:  Boost 1.55.0      |   Severity:  Problem
Resolution:                    |   Keywords:
-------------------------------+----------------------

Comment (by raad@…):

 Please see the attached simple example for MSVC12. The error message is:

 {{{
 boost_call_once_test\boost_call_once_test\boost_call_once_test.cpp(19):
 error C2665: 'boost::call_once' : none of the 2 overloads could convert
 all the argument types
 1>
 boost_call_once_test\boost_call_once_test\boost\thread\win32\once.hpp(232):
 could be 'void boost::call_once(boost::once_flag &,void (__cdecl
 *)(void))'
 1>
 boost_call_once_test\boost_call_once_test\boost\thread\once.hpp(35): or
 'void boost::call_once<boost::once_flag>(Function,boost::once_flag &)'
 1>          with
 1>          [
 1>              Function=boost::once_flag
 1>          ]
 1>          while trying to match the argument list '(boost::once_flag,
 boost::_bi::bind_t<void,boost::_mfi::mf0<void,test_class>,boost::_bi::list1<boost::_bi::value<T>>>)'
 1>          with
 1>          [
 1>              T=test_class
 1>          ]
 }}}

 I don't know why the error message doesn't even mention
 {{{
 void call_once<Function>(once_flag& flag, boost::rv<Function> &f)
 }}}
 , IntelliSense suggests that overload too.

 clang gives similar errors.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/10125#comment:2>
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