ref doesn't work with noncopyable object

[Maxim Yanchenko <Maxim.Yanchenko@…>]

the following code fails to compile with both boost 1.47 and 1.49 (GCC 4.4.4):

#include <boost/phoenix.hpp>

class A
{
    A(const A&);
    A& operator=(const A&);
public:
    A() {}
    const A& operator<<(const char *p) const 
    { 
        return *this; 
    }
} g_a;

int main()
{
  ( boost::phoenix::ref(g_a) << boost::phoenix::placeholders::_1 )("test");
}

error: 'A::A(const A&)' is private

Btw, it also doesn't work with boost::lambda::var, in the same manner.

[Kohei Takahashi]

dup of #6026