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

From: Brian Braatz (brianb_at_[hidden])
Date: 2005-06-18 00:33:23

CLOSER (see below)

> -----Original Message-----
> From: boost-bounces_at_[hidden]
[mailto:boost-bounces_at_[hidden]]
> On Behalf Of Ryan
> Sent: Friday, June 17, 2005 9:24 PM
> To: boost_at_[hidden]
> Subject: Re: [boost] MPL: set<> not fully supporting compile time
> iteration?
> 
> 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;
> 
> HTH
> 
> -Ryan
> 

[Brian Braatz Writes:] 
THANK YOU RYAN- I am compiling now (one step closer)
But I am still not getting the expected (??) behavior
here is the current code

struct A    {};
struct B    {};
struct C    {};
struct D    {};

struct print_type
{
    template <typename T>
    void operator()(T const& v) const
    {
        std::cout << "[ " << typeid(v).name() << " ] ";
    }
};
    typedef mpl::set3<A,B,C> myset;
    typedef mpl::vector<>   vec;    
    
    // copy it to a vector
    typedef  mpl::copy       
    <
         mpl::begin<myset>
        , back_inserter< vec >

    >::type result_vec;
    
    // Prints "0"
    cout << "result_vec size " << mpl::size<result_vec>::value << endl;
    
    // prints nothing
    mpl::for_each<result_vec>( print_type());

ANYONE- wishing to show me how I did something ABSOLTULEY stupid or
missed some concept- please, by all means 

:)

I am starting to believe though that there is something broken with
mpl::set<>  (typically developer- blame either the compiler or the
library (grin))