Re: [boost] Re: Interesting Boost Implementation Details?

From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2005-01-12 22:25:45

Arkadiy Vertleyb writes:
> One problem that I have with mpl::template_arity, though, is that it
> seems to be undocumented...  And therefore probably an internal
> feature?

Yes, it's an implementation detail. Currently, at least.

>
> As for your question however, the conceptual problem with template
> template parameters is that they can't be returned from
> meta-functions:
>
> template<template<class> class T> class X
> {
>     // I know T here, but how do I pass it outside???

      typedef T<_> type;
or 
      typedef mpl::quote1<T> type;

> };
>
> Of course, they can be wrapped...  I am wondering whether it would be
> possible to use this....

Depends on what you want to do with the result. One thing you can do
for sure is to instantiate it with particular arguments.

-- 
Aleksey Gurtovoy
MetaCommunications Engineering