Boost logo

Boost :

Subject: [boost] [mpl] [type_traits] [enable_if] Overloading Problem with GCC 3.3.3
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2009-12-08 15:17:44


Can anyone figure out why GCC 3.3.3 doesn't like the following member function overloads? VC7/8/9 and GCC 4.1.2 have no problems with this code.

#include <boost/mpl/and.hpp>
#include <boost/mpl/not.hpp>
#include <boost/type_traits/is_const.hpp>
#include <boost/type_traits/is_convertible.hpp>
#include <boost/utility/enable_if.hpp>

struct Bar
{
};

template <class T>
struct Baz
{
};

struct Foo
{
   template <class T>
   typename boost::enable_if
   <
      boost::mpl::and_
      <
         boost::is_convertible<T,Bar>
         , boost::mpl::not_<boost::is_const<T> >
>
>::type
   set(Baz<T> const & _value);

   template <class T>
   typename boost::enable_if
   <
      boost::mpl::and_
      <
         boost::is_convertible<T,Bar>
         , boost::is_const<T>
>
>::type
   set(Baz<T> const &);
};

GCC 3.3.3's error message is:

error: `template<class T> typename
   boost::enable_if<boost::mpl::and_<boost::is_convertible<T, Bar>,
   boost::is_const<T>, mpl_::bool_<true>, mpl_::bool_<true>, mpl_::bool_<true>
>, void>::type Foo::set(const Baz<T>&)' and `template<class T> typename
   boost::enable_if<boost::mpl::and_<boost::is_convertible<T, Bar>,
   boost::mpl::not_<boost::is_const<T> >, mpl_::bool_<true>, mpl_::bool_<true>,
   mpl_::bool_<true> >, void>::type Foo::set(const Baz<T>&)' cannot be
   overloaded

_____
Rob Stewart robert.stewart_at_[hidden]
Software Engineer, Core Software using std::disclaimer;
Susquehanna International Group, LLP http://www.sig.com

IMPORTANT: The information contained in this email and/or its attachments is confidential. If you are not the intended recipient, please notify the sender immediately by reply and immediately delete this message and all its attachments. Any review, use, reproduction, disclosure or dissemination of this message or any attachment by an unintended recipient is strictly prohibited. Neither this message nor any attachment is intended as or should be construed as an offer, solicitation or recommendation to buy or sell any security or other financial instrument. Neither the sender, his or her employer nor any of their respective affiliates makes any warranties as to the completeness or accuracy of any of the information contained herein or that this message or any of its attachments is free of viruses.


Boost list run by bdawes at acm.org, gregod at cs.rpi.edu, cpdaniel at pacbell.net, john at johnmaddock.co.uk