Re: [boost] MPL: set<> not fully supporting compile time iteration?

From: David Abrahams (dave_at_[hidden])
Date: 2005-06-18 05:23:29

Ryan <ryan.gallagher_at_[hidden]> writes:

> Brian Braatz <brianb <at> rmtg.com> writes:
>> [snip]
>>     // copy it to a vector
>>     typedef  mpl::copy       
>>     <
>>         myset::type
>>         , back_inserter< vec >
>> 
>>     >::type result_vec;
>> 
>>    mpl::for_each<result_vec>( print_type());
>> }
>> ...
>
> Try:
>
> typedef mpl::copy
> <
>    mpl::begin<myset>
> ,  mpl::back_inserter<vec>
>>::type result_vec;

Err, no.  The manual says:

  template<
        typename Sequence
      , typename In = unspecified
      >
  struct copy
  {
      typedef unspecified type;
  };

There was nothing wrong with what Brian wrote, although he could have
dropped ::type from myset::type.  I'm looking into the causes of his
trouble right now.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com