id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
7850	polymorphic_iarchive_route.hpp: declaration of 'is' shadows a member of 'this'	Luc Perneel <l.perneel@…>	Robert Ramey	"When compiling the demo application:
./libs/serialization/example/demo_polymorphic.cpp

using gcc (in our case 3.4.3) with –Wall –Werror, this fails due to:

. /boost/archive/polymorphic_text_iarchive.hpp:37:   instantiated from here
./boost/archive/detail/polymorphic_iarchive_route.hpp:199: warning: declaration of 'is' shadows a member of 'this'

I checked this in the latest release (aka 1.52) and error is still in:

It is caused by the definition in:

http://www.boost.org/doc/libs/1_52_0/boost/archive/basic_text_iprimitive.hpp :

{{{
template<class IStream>
class basic_text_iprimitive
{
#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
protected:
#else
public:
#endif
    IStream &is; 
    io::ios_flags_saver flags_saver;
}}}

combined with the implementation in:
http://www.boost.org/doc/libs/1_52_0/boost/archive/detail/polymorphic_iarchive_route.hpp :
{{{
    // all current archives take a stream as constructor argument
    template <class _Elem, class _Tr>
    polymorphic_iarchive_route(
        std::basic_istream<_Elem, _Tr> & is,
        unsigned int flags = 0
    ) :
        ArchiveImplementation(is, flags)
    {}
    virtual ~polymorphic_iarchive_route(){};
}}}

As you can see: in the basic_test_iprimitive, “is” is a member (aka IStream) while in polymorphic_iarchive_route.hpp it is an argument in ArchiveImplementation 

I fixed it in our case by replacing the “is” in the argument case with “is_arg”:
{{{ 
    // all current archives take a stream as constructor argument
    template <class _Elem, class _Tr>
    polymorphic_iarchive_route(
        std::basic_istream<_Elem, _Tr> & is_arg,
        unsigned int flags = 0
    ) :
        ArchiveImplementation(is_arg, flags)
    {}
    virtual ~polymorphic_iarchive_route(){};
}}} 

Best Regards,
Luc
"	Bugs	closed	To Be Determined	serialization	Boost 1.52.0	Problem	fixed	serialization polymorphic shadow