Linker error - VS2005 thinks it's a function declaration?

Base base;
BaseWrap& baseWrap(reinterpret_cast<BaseWrap&>(base));
boost::python::object obj(boost::shared_ptr<BaseWrap>(&baseWrap)); //
Compile error

Results in this error:

1>PythonPassReference.obj : error LNK2019: unresolved external symbol
"class boost::python::api::object __cdecl obj(class
boost::shared_ptr<struct BaseWrap&)" (?obj@@YA?
AVobject@api@python@boost@@AAV?$shared_ptr@UBaseWr ap@@@4@@Z)
referenced in function _main

My first thought is somehow that looks like a function declaration
instead of creating an object on the stack and instantiating it. If I
remove the shared_ptr, the error goes away.

In case it helps, here's a few more details.

boost::python::object has the following constructor:

// explicit conversion from any C++ object to Python
template <class T>
explicit object(
T const& x
# if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
// use some SFINAE to un-confuse MSVC about its
// copy-initialization ambiguity claim.
, typename mpl::if_<is_proxy<T>,int&,int>::type* = 0
# endif
)
: object_base(object_base_initializer(x))
{
}

boost::shared_ptr<Thas the following constructor:

template<class Y>
explicit shared_ptr( Y * p ): px( p ), pn( p ) // Y must be
complete
{
boost::detail::sp_enable_shared_from_this( pn, p, p );
}

Any tips on how to solve this would be greatly appreciated. I'm
probably overlooking something obvious.

Thanks in advance,

Lawrence

Lawrence Spector wrote:You are overlooking something, but it's not that obvious. Your 'obj'
declaration is similar to

double obj(int(&blah));

Care to parse it? A hint: the parentheses around &blah don't matter.

....

Give up? It's the same as

double obj(int &blah);

Look familiar? It's a function declaration!

How do you prevent this from being treated as a function declaration?
Put extra parentheses around the "argument":

double obj((int(&blah)));

In your case:

boost::python::object obj( (boost::shared_ptr<BaseWrap>(&baseWrap)) );

V
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