id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
5724,"""0 + 0"" and ""0 - 0"" lead to a compile time error",iorate <iorate_stage@…>,viboes,"The following code causes a compilication error under GCC 4.5, 4.6 and VC 10.
{{{
#define BOOST_RATIO_EXTENSIONS
#include <boost/ratio.hpp>

using namespace boost;

typedef ratio_add<ratio<0>, ratio<0> >::type zero_plus_zero;
typedef ratio_subtract<ratio<0>, ratio<0> >::type zero_minus_zero;
}}}
Error messages (GCC 4.6.0):
{{{
In file included from C:/Opt/boost/boost/ratio/ratio.hpp:48:0,
                 from C:/Opt/boost/boost/ratio/include.hpp:11,
                 from C:/Opt/boost/boost/ratio.hpp:12,
                 from test.cpp:2:
C:/Opt/boost/boost/ratio/detail/overflow_helpers.hpp: In instantiation of 'boost::ratio_detail::ratio_add<boost::ratio<0ll>, boost::ratio<0ll> >':
C:/Opt/boost/boost/ratio/ratio.hpp:136:8:   instantiated from 'boost::ratio_add<boost::ratio<0ll>, boost::ratio<0ll> >'
test.cpp:5:39:   instantiated from here
C:/Opt/boost/boost/ratio/detail/overflow_helpers.hpp:243:18: error: '(0ll / 0ll)' is not a constant expression
C:/Opt/boost/boost/ratio/detail/overflow_helpers.hpp:243:18: note: in template argument for type 'long long int' 
test.cpp:5:9: error: 'type' in class 'boost::ratio_add<boost::ratio<0ll>, boost::ratio<0ll> >' does not name a type
In file included from C:/Opt/boost/boost/ratio/ratio.hpp:48:0,
                 from C:/Opt/boost/boost/ratio/include.hpp:11,
                 from C:/Opt/boost/boost/ratio.hpp:12,
                 from test.cpp:2:
C:/Opt/boost/boost/ratio/detail/overflow_helpers.hpp: In instantiation of 'boost::ratio_detail::ratio_subtract<boost::ratio<0ll>, boost::ratio<0ll> >':
C:/Opt/boost/boost/ratio/ratio.hpp:142:8:   instantiated from 'boost::ratio_subtract<boost::ratio<0ll>, boost::ratio<0ll> >'
test.cpp:6:44:   instantiated from here
C:/Opt/boost/boost/ratio/detail/overflow_helpers.hpp:269:18: error: '(0ll / 0ll)' is not a constant expression
C:/Opt/boost/boost/ratio/detail/overflow_helpers.hpp:269:18: note: in template argument for type 'long long int' 
test.cpp:6:9: error: 'type' in class 'boost::ratio_subtract<boost::ratio<0ll>, boost::ratio<0ll> >' does not name a type",Bugs,closed,To Be Determined,ratio,Boost 1.47.0,Problem,fixed,,