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

From: Brian Braatz (brianb_at_[hidden])
Date: 2005-06-19 11:03:37

IT WORKS! (See below)

> >> -----Original Message-----
[Dave Abrahams Writes:] 
> I have checked in a fix for this problem.  I even figured out how to
> preprocess the right headers.  Yay me!
> 
> Well, maybe you should tell me if the fix works for you before I
> strut and celebrate ;-)

[Brian Braatz Writes:] 
YES THANK YOU! THANK YOU! THANK YOU! THANK YOU! THANK YOU! 

here is the original code:
(note to reader from the future, this will NOT work on boost1.32- it
should work on any version following)

// Code sample for how to copy from a mpl::set<> to a mpl::vector<>
// prints the names of the resulting vector
struct print_type
{
    template <typename T>
    void operator()(T const& v) const
    {
        std::cout << "[ " << typeid(v).name() << " ] ";
    }
};

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

    typedef mpl::set3<A,B,C> myset;
    typedef mpl::vector<>   vec;    
    
    // copy a set to a vector
    typedef  mpl::copy       
    <
         myset
        , back_inserter< vec::type >

    >::type result_vec;
    
    // Prints "3"
    cout << "result_vec size " << mpl::size<result_vec>::value << endl;
    
    // prints "[ struct C ] [ struct B ] [ struct A ] "
    mpl::for_each<result_vec::type>( print_type());

THANK YOU DAVID- This is a huge help. :)