Re: [boost] shared_ptr comparison

From: Daniel Frey (daniel.frey_at_[hidden])
Date: 2001-08-17 07:45:39

Peter Dimov wrote:
> 
> // std::less specializations do not help in cases like
> //   map<pair<shared_ptr, int>, int>
> //

Maybe I don't understand the problem here, but given that less<> is
defined for the pair's sub-types, a generic less<> for pair could solve
this problem. Something like this:

namespace std
{
   template< class First, class Second > struct less< pair< First,
Second > >
   {
      inline bool less< pair< First, Second > >::operator()( const pair<
First, Second >& x, const pair< First, Second >& y ) const
      {
         return less< First >()( x.first, y.first ) || ( !less< First
>()( y.first, x.first ) && less< Second >()( x.second, y.second ) );
      }
   };
}

Or is there something I'm missing here?

Regards, Daniel

--
Daniel Frey
aixigo AG - financial training, research and technology
Schloß-Rahe-Straße 15, 52072 Aachen, Germany
fon: [phone], fax: [phone]
eMail: daniel.frey_at_[hidden], web: http://www.aixigo.de