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

Subject: Re: [Boost-users] [mpl][fusion] How to transform vector_c into std::vector?
From: Larry Evans (cppljevans_at_[hidden])
Date: 2013-11-28 14:21:42

On 11/28/13 00:37, Mostafa wrote:
> On Wed, 27 Nov 2013 21:09:04 -0800, TONGARI J <tongari95_at_[hidden]> wrote:
>
>> 2013/11/28 Mostafa <mostafa_working_away_at_[hidden]>
>>
>>> How does one transform an mpl:vector_c into a regular std::vector?
>>>
>>> Sample input:
>>>
>>> typedef mpl::vector<int, int_<10>, 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