[C++-sig] init from free function instead of constructor

[John Reid]

John Reid wrote:
> Well it returns by value as in the example. I shall have a look at the 
> call policies documentation.
> 
Ok so by-value should be handled by the default call policies if the 
documentation is right.

I have checked with a minimal test case that I get the same errors:

class X { };
X make_x( const std::string & ) { return X(); }
void export_x()
{
	using namespace boost::python;
	class_< X > x( "X" );
	x.def( "__init__", make_constructor( make_x ) );
}

gives me:

C:\Dev\ThirdParty\boost\RC_1_34_0\boost\boost/python/pointee.hpp(28) : 
error C2039: 'element_type' : is not a member of 'X'
         python_transfac.cpp(24) : see declaration of 'X'
 
C:\Dev\ThirdParty\boost\RC_1_34_0\boost\boost/python/pointee.hpp(38) : 
see reference to class template instantiation 
'boost::python::detail::pointee_impl<false>::apply<T>' being compiled
         with
         [
             T=X
         ]
 
C:\Dev\ThirdParty\boost\RC_1_34_0\boost\boost/python/make_constructor.hpp(54) 
: see reference to class template instantiation 
'boost::python::pointee<T>' being compiled
         with
         [
             T=X
         ]
 
C:\Dev\ThirdParty\boost\RC_1_34_0\boost\boost/python/make_constructor.hpp(39) 
: see reference to function template instantiation 'void 
boost::python::detail::install_holder<T>::dispatch<T>(Ptr,boost::mpl::false_) 
const' being compiled
         with
         [
             T=result_t,
             Ptr=result_t
         ]
 
C:\Dev\ThirdParty\boost\RC_1_34_0\boost\boost/python/make_constructor.hpp(38) 
: while compiling class template member function 'PyObject 
*boost::python::detail::install_holder<T>::operator ()(T) const'
         with
         [
             T=result_t
         ]
 
C:\Dev\ThirdParty\boost\RC_1_34_0\boost\boost/python/detail/caller.hpp(196) 
: see reference to class template instantiation 
'boost::python::detail::install_holder<T>' being compiled
         with
         [
             T=result_t
         ]
 
C:\Dev\ThirdParty\boost\RC_1_34_0\boost\boost/python/detail/caller.hpp(176) 
: while compiling class template member function 'PyObject 
*boost::python::detail::caller_arity<1>::impl<F,Policies,Sig>::operator 
()(PyObject *,PyObject *)'
         with
         [
             F=X (__cdecl *)(const std::string &),
             Policies=inner_policy,
             Sig=boost::mpl::vector2<X,const std::string &>
         ]
 
C:\Dev\ThirdParty\boost\RC_1_34_0\boost\boost/python/detail/caller.hpp(145) 
: see reference to class template instantiation 
'boost::python::detail::caller_arity<1>::impl<F,Policies,Sig>' being 
compiled
         with
         [
             F=X (__cdecl *)(const std::string &),
             Policies=inner_policy,
             Sig=boost::mpl::vector2<X,const std::string &>
         ]
 
C:\Dev\ThirdParty\boost\RC_1_34_0\boost\boost/python/make_constructor.hpp(152) 
: see reference to class template instantiation 
'boost::python::detail::caller<F,CallPolicies,Sig>' being compiled
         with
         [
             F=X (__cdecl *)(const std::string &),
             CallPolicies=inner_policy,
             Sig=boost::mpl::vector2<X,const std::string &>
         ]
 
C:\Dev\ThirdParty\boost\RC_1_34_0\boost\boost/python/make_constructor.hpp(230) 
: see reference to function template instantiation 
'boost::python::api::object 
boost::python::detail::make_constructor_aux<X(__cdecl *)(const 
std::string 
&),boost::python::default_call_policies,boost::mpl::vector2<T0,T1>>(F,const 
CallPolicies &,const Sig &)' being compiled
         with
         [
             T0=X,
             T1=const std::string &,
             F=X (__cdecl *)(const std::string &),
             CallPolicies=boost::python::default_call_policies,
             Sig=boost::mpl::vector2<X,const std::string &>
         ]
         python_transfac.cpp(30) : see reference to function template 
instantiation 'boost::python::api::object 
boost::python::make_constructor<X(__cdecl *)(const std::string &)>(F)' 
being compiled
         with
         [
             F=X (__cdecl *)(const std::string &)
         ]
C:\Dev\ThirdParty\boost\RC_1_34_0\boost\boost/python/pointee.hpp(28) : 
error C2146: syntax error : missing ';' before identifier 'type'
C:\Dev\ThirdParty\boost\RC_1_34_0\boost\boost/python/pointee.hpp(28) : 
error C4430: missing type specifier - int assumed. Note: C++ does not 
support default-int
C:\Dev\ThirdParty\boost\RC_1_34_0\boost\boost/python/pointee.hpp(28) : 
error C2208: 'boost::type' : no members defined using this type
C:\Dev\ThirdParty\boost\RC_1_34_0\boost\boost/python/pointee.hpp(28) : 
fatal error C1903: unable to recover from previous error(s); stopping 
compilation

so I'm stuck :(

John.