Re: [boost] [TypeErasure] Forward constructors and binded types

Subject: Re: [boost] [TypeErasure] Forward constructors and binded types
From: Larry Evans (cppljevans_at_[hidden])
Date: 2012-07-19 08:06:30

On 07/19/12 06:08, Larry Evans wrote:
> On 07/18/12 01:29, Vicente J. Botet Escriba wrote:
>> Hi,,
>>
>> In the example from the doc
>>
>>     typedef mpl::vector<
>>         copy_constructible<_a>,
>>         copy_constructible<_b>,
>>         copy_constructible<_c>,
>>         constructible<_a(const _b&, const _c&)>
>>     > construct;
>>
>>     std::vector<double> vec;
>>     int i = 10;
>>     double d = 2.5;
>>     tuple<construct, _a&, _b, _c> t(vec, i, d);
>>     any<construct, _a> v(get<1>(t), get<2>(t));
>>
> [snip]
> The 1st attachment, composed from above, doesn't compile,
> giving errors in 2nd attachment.
> 
> svn update shows:
> 
>   Updated to revision 79597.
> 
> How should the code be changed to allow compilation?
> 
It compiles OK when the -std=gnu++11 option is removed.
However, it's still producing warnings like:

../../../boost/type_erasure/detail/adapt_to_vtable.hpp: In static member
function 'static R
boost::type_erasure::detail::vtable_adapter<PrimitiveConcept,
R()>::value()':
../../../boost/type_erasure/detail/adapt_to_vtable.hpp:236:11: warning:
typedef 'traits' locally defined but not used [-Wunused-local-typedefs]
         > traits;
           ^
In file included from botet_construct.cpp:6:0:
../../../boost/type_erasure/any_cast.hpp: In function 'T
boost::type_erasure::any_cast(const boost::type_erasure::any<Concept,
Tag>&)':
../../../boost/type_erasure/any_cast.hpp:132:13: warning: typedef
'tag_type' locally defined but not used [-Wunused-local-typedefs]
     >::type tag_type;
             ^

This is with compiler:

ftp://gcc.gnu.org/pub/gcc/snapshots/4.8-20120624/gcc-4.8-20120624.tar.bz2

-regards,
Larry