[boost] is_shared_ptr<T> implementation

From: Hugo.Duncan_at_[hidden]
Date: 2002-03-19 09:06:07

I am trying to specialise some code for shared pinters without using
partial specialisation, so need a is_shared_ptr<T>.

The best I have come up with so far is below, which works with gcc-2.95.3-5
(cygwin), borland 5.5.1, msvc 6.

Is it worth adding an is_shared_ptr<T> to type_traits somewhere ?

Hugo

#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
  template <typename T>
  struct is_shared_ptr
  {
    BOOST_STATIC_CONSTANT( bool , value=false );
  };
  template <typename T>
  struct is_shared_ptr<boost::shared_ptr<T> >
  {
    BOOST_STATIC_CONSTANT( bool , value=true );
  };
#else
  template <typename T>
  struct is_shared_ptr
  {
    enum { value=boost::is_convertible<T,::boost::shared_ptr<void> >::value };
  };
#endif