[Bug c++/13554] New: static_cast fails in Boost.Math library

[john at johnmaddock dot co dot uk]

I have a corner case where a static cast fails if the target type has an 
explicit constructor, the case is abstacted from the Boost.Math library, and 
compiles OK with VC++7.1 and EDG-frontend compilers, the failure seems to be a 
regression from previous gcc releases:

namespace boost{

template<typename T, template<typename> class U>
U<T> test(const U<T>& t)
{
  U<T> x = static_cast<U<T> >(1);
  return t + x;
}

namespace nested{

template <class T>
struct numeric
{
  numeric(){ m_value = 0; }
  explicit numeric(T t){ m_value = t; }
  T value()const { return m_value; }
  private:
  T m_value;
};

template <class T>
numeric<T> operator+(const numeric<T>& a, const numeric<T>& b)
{
  return numeric<T>(a.value() + b.value());
}

}

}

int main()
{
   boost::nested::numeric<double> num(2);
   boost::test(num);
   return 0;
}

-- 
           Summary: static_cast fails in Boost.Math library
           Product: gcc
           Version: 3.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: john at johnmaddock dot co dot uk
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13554