[Boost-users] Re: mpl::vector -> boost::tuple

From: David Abrahams (dave_at_[hidden])
Date: 2004-06-29 09:45:57

Markus Werle <numerical.simulation_at_[hidden]> writes:

> all seem to me work fine with default constructible types.
> What I need is a type generator which provides a constructor, such that
> code like this one works for mpl::vectors (or other mpl::sequences) 
> with arbitrary length:
>
> -------------
> class C { C(std::string const & gaga) {} };
>
> struct gen_linear_hierarchy_with_constructor
> // your idea missing here
> {
> // and here
> };
>
> typedef 
> gen_linear_hierarchy_with_constructor<mpl::vector<C, C> >::type mytuple;
>
> mytuple mt("test", "Thanks for your help");
> ------------------
>

What you really want is the fusion library (in CVS), which will
replace Boost.Tuple:

   #include <boost/spirit/fusion/sequence/generate.hpp>

   typedef
     boost::fusion::result_of_generate<some_type_sequence>::type
   mytuple;
     
I don't know of another (easy) solution for you.

> Markus
>
>
> P.S.: David and Aleksey, if you read this here: I could not find your
> "coming soon" book at awprofessional.com. What's the current state 
> of the book I wait for so long already ...

"Sanity-check reviewed" and about to enter final copyediting at
Addison Wesley.

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com