function_equal should work with binds holding weak_ptr values

[Gareth Sylvester-Bradley <gareth.sylvester-bradley@…>]

​http://lists.boost.org/Archives/boost/2008/07/139970.php

To fix the compiler error in the program below, please can we add the following (e.g. to boost/bind.hpp) -

#include <boost/weak_ptr.hpp>

namespace boost
{
  namespace _bi
  {
    template<class T> bool ref_compare( value< weak_ptr<T> >
const & a, value< weak_ptr<T> > const & b, long )
    {
      return !(a.get() < b.get()) && !(b.get() < a.get());
    }
  }
} 

-- main.cpp --

#include <boost/function_equal.hpp>
#include <boost/bind.hpp>
#include <boost/weak_ptr.hpp>

int h( boost::weak_ptr<void> wp ) { return wp.use_count(); }

template < typename F > bool self_equal( F f_ )
{
  return function_equal( f_, f_ );
}

int main( int argc, char * const argv[] )
{
  self_equal( boost::bind( h, _1 ) ); // OK
  self_equal( boost::bind( h, boost::weak_ptr<void>() ) ); // compiler
error
  return 0;
}

[Peter Dimov]

(In [51979]) Add ref_compare for weak_ptr. Refs #2849.

[Peter Dimov]

(In [52041]) Merge [51979] to release. Closes #2849.