Re: [Boost-users] [mpl][fusion] How to transform vector_c into std::vector?

On Thu, 28 Nov 2013 11:21:42 -0800, Larry Evans wrote:

On 11/28/13 00:37, Mostafa wrote:

...

On Wed, 27 Nov 2013 21:09:04 -0800, TONGARI J wrote:

...

2013/11/28 Mostafa

...

How does one transform an mpl:vector_c into a regular std::vector?

Sample input:

typedef mpl::vector, int_<11>, int_<12> > some_vector_c;

Perhaps:

std::vector<int> v; fusion::for_each(some_vector_c(), [&v](int val){v.push_back(val);});

Thanks, I ended up using mpl's for_each. Even though I don't quite understand how it works. Specifically, what does boost::get do? I couldn't find any documentation on it. See it's definition here:

http://www.boost.org/doc/libs/1_55_0/libs/utility/value_init.htm

The mpl for_each doc would be clearer if:

typedef begin<Sequence>::type i1; value_initialized< deref<i1>::type > x1; f(boost::get(x1));

were replaced with:

typedef begin<Sequence>::type i1; value_initialized< deref<i1>::type > x1; f(x1.data());

then there would be no chance about which get was being used.

-Larry

Thanks. It seems get is used because it's recommended practice. See the section "Recommended practice: The non-member get() idiom". It would have been quite helpful if the mpl doc linked to this section of the value_init doc. Mostafa