Re: [boost] [foreach] Errors using foreach

Subject: Re: [boost] [foreach] Errors using foreach
From: Edward Diener (eldiener_at_[hidden])
Date: 2015-03-03 20:43:45

On 3/3/2015 7:58 PM, Edward Diener wrote:
> When trying to use the foreach library, whether running it tests or
> trying to build quickbook which uses the foreach macro, I am seeing from
> different compilers:
>
> gcc-4.9.2
>
>> In file included from stl_byval.cpp:15:0:
>> ./utility.hpp: In function 'bool
>> sequence_equal_byval_n(foreach_container_type&, const char*)':
>> ..\..\../boost/foreach.hpp:906:96: error: no matching function for
>> call to 'encode_type(foreach_container_type&,
>> boost::is_const<std::list<int> >*)'
>>      (true ? 0 : boost::foreach_detail_::encode_type(COL,
>> boost::foreach_detail_::is_const_(COL)))
>>
>> ^
>> ..\..\../boost/foreach.hpp:1013:9: note: in expansion of macro
>> 'BOOST_FOREACH_TYPEOF'
>>        ,
>> BOOST_FOREACH_TYPEOF(COL)
>> \
>>          ^
>> ..\..\../boost/foreach.hpp:1095:77: note: in expansion of macro
>> 'BOOST_FOREACH_BEGIN'
>>      if (boost::foreach_detail_::auto_any_t
>> BOOST_FOREACH_ID(_foreach_cur) = BOOST_FOREACH_BEGIN(COL)) {} else     \
>>
>> ^
>> ./utility.hpp:20:5: note: in expansion of macro 'BOOST_FOREACH'
>>      BOOST_FOREACH( foreach_value_type i, rng )
>>      ^
>
> clang
>
>> In file included from stl_byval.cpp:25:
>> ././utility.hpp:20:5: error: no matching function for call to
>> 'encode_type'
>>     BOOST_FOREACH( foreach_value_type i, rng )
>>     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> ..\..\..\boost/foreach.hpp:1095:77: note: expanded from macro
>> 'BOOST_FOREACH'
>>     if (boost::foreach_detail_::auto_any_t
>> BOOST_FOREACH_ID(_foreach_cur) = BOOST_FOREACH_BEGIN(COL)) {} else     \
>>
>> ^~~~~~~~~~~~~~~~~~~~~~~~
>> ..\..\..\boost/foreach.hpp:1013:9: note: expanded from macro
>> 'BOOST_FOREACH_BEGIN'
>>       ,
>> BOOST_FOREACH_TYPEOF(COL)
>> \
>>         ^~~~~~~~~~~~~~~~~~~~~~~~~
>> ..\..\..\boost/foreach.hpp:906:17: note: expanded from macro
>> 'BOOST_FOREACH_TYPEOF'
>>     (true ? 0 : boost::foreach_detail_::encode_type(COL,
>> boost::foreach_detail_::is_const_(COL)))
>>                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> ..\..\..\boost/foreach.hpp:401:22: note: candidate function [with T =
>> std::list<int, std::allocator<int> >] not viable: no known conversion
>> from 'boost::is_const<list<int, allocator<int> > > *' to
>> 'boost::mpl::false_ *' (aka 'bool_<false> *') for 2nd argument
>> inline type2type<T> *encode_type(T &, boost::mpl::false_ *) { return 0; }
>>                      ^
>> ..\..\..\boost/foreach.hpp:404:30: note: candidate function [with T =
>> std::list<int, std::allocator<int> >] not viable: no known conversion
>> from 'boost::is_const<list<int, allocator<int> > > *' to
>> 'boost::mpl::true_ *' (aka 'bool_<true> *') for 2nd argument
>> inline type2type<T, const_> *encode_type(T const &, boost::mpl::true_
>> *) { return 0; }
>>                              ^
>> In file included from stl_byval.cpp:25:
>> ././utility.hpp:20:5: error: no matching function for call to
>> 'encode_type'
>>     BOOST_FOREACH( foreach_value_type i, rng )
>>     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> Does anybody know what is causing this error ? I can't seem to proceed
> in building documentation with quickbook until I can get foreach
> working. I pulled the latest foreach from the master branch and ran b2
> headers but still the problem occurs.

This comes from my testing of type_traits Version2. Sorry for the noise <g>.