Re: [Boost-bugs] [Boost C++ Libraries] #7964: 'boost::system::error_code::unspecified_bool_type' : forcing value to bool 'true' or 'false' (performance warning)

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #7964: 'boost::system::error_code::unspecified_bool_type' : forcing value to bool 'true' or 'false' (performance warning)
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-02-03 19:07:04

#7964: 'boost::system::error_code::unspecified_bool_type' : forcing value to bool
'true' or 'false' (performance warning)
--------------------------------------+-------------------------------------
  Reporter:  szx <szx@…>              |       Owner:  bemandawes
      Type:  Bugs                     |      Status:  new       
 Milestone:  To Be Determined         |   Component:  system    
   Version:  Boost Development Trunk  |    Severity:  Problem   
Resolution:                           |    Keywords:            
--------------------------------------+-------------------------------------

Comment (by szx <szx@…>):

 Strangely enough it seems to only appear in lambda functions because this
 code compiles without warnings:

 #include <boost/system/error_code.hpp>

 void f(const boost::system::error_code &error) {
         if (error) {}
 }

 int main() {
         f(boost::system::error_code());
 }

 while the following one

 #include <boost/system/error_code.hpp>
 int main() {
         auto lambda = [](const boost::system::error_code &error) {
                 if (error) {}
         };
 }

 results in

 test.cpp(6): warning C4800:
 'boost::system::error_code::unspecified_bool_type' : forcing value to bool
 'true' or 'false' (performance warning)

 It's probably a compiler bug then I would guess.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/7964#comment:2>
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