Re: C++ as a target language

From:
alfps@start.no ("Alf P. Steinbach")
Newsgroups:
comp.std.c++
Date:
Mon, 24 Jul 2006 13:56:31 GMT
Message-ID:
<4ii2rrF3q79uU1@individual.net>
* SuperKoko:

"Alf P. Steinbach" wrote:

Yep. I think it's beyond hope to get a new, alternative typedef syntax
in place. In an ideal world, perhaps one could get a 'typename'
construct added, used like (compare to real code in previous posting)

<hypotheticalcode>
#include <utility> // std::pair
#include <boost/shared_ptr.hpp> // boost::shared_ptr
namespace stdx = boost;

template< typename T >
struct List
{
     typename Node; // NEW LANGUAGE FEATURE, recursive defs.
     typedef stdx::shared_ptr<Node> Instance;
     typedef std::pair<T, Instance> Node;

     static Instance null() { return Instance(); }
     static Instance cons( T const& v, Instance list )
     {
         return Instance( new :Node( v, list ) );
     }
};


Do you mean, something similar to (forward) declarations of structures.


Yes.

In that case, it is not possible


It is.

(or at least, not a good idea):


I think it is.

It would require that all pointers have the same object representation.


They already have, for pointers to class type objects. :-)

[lengthy irrelevant argument, snipped]

Cheers,

- Alf

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