Geometry Boost List: Re: [geometry] Run-Time specified geometries

Subject: Re: [geometry] Run-Time specified geometries
From: Mateusz Loskot (mateusz_at_[hidden])
Date: 2013-10-23 11:32:19

y On 23 October 2013 16:28, Mateusz Loskot <mateusz_at_[hidden]> wrote:
> On 23 October 2013 08:58, Samuel Debionne
> <samuel.debionne_at_[hidden]> wrote:
>> Hello all,
>> I'm wondering if someone is working on a runtime layer above the actual
>> Boost.Geometry. Something in the same vein than GIL's dynamic images
>> (any_views and algorithms that accept and dispatch such runtime/variant
>> types).
>>
>> I have done a few experiments with Boost.Variant but before going on I
>> would like to make sure that it's not already a work in progress.
>
> As mentioned in this thread about WKB
> (http://lists.boost.org/geometry/2013/07/2404.php),
> variant or dynamic geometry type has been discussed some time ago.
>
> We started the discussion based on some prototype for "any_geometry" I
> made here:
>
> https://github.com/mloskot/boost-geometry-workshop/blob/master/boost_geometry_any.cpp
> https://github.com/mloskot/boost-geometry-workshop/blob/master/boost_geometry_any.cpp
>
> Eventually, we agreed to use boost::variant and Bruno proposed it here:
>
> http://svn.boost.org/svn/boost/trunk/boost/geometry/geometries/variant.hpp
>
> In fact, variant geometry type in action is also presented in examples
> for the spatial index:
>
> http://www.boost.org/doc/libs/release/libs/geometry/doc/html/geometry/spatial_indexes/rtree_examples/index_of_iterators_of_a_map_storing_variant_geometries.html
>
> So, this is work in progress, indeed.

By the way, there are some custom solutions made by BG users,
like here in brig project:

https://code.google.com/p/brig/source/browse/boost/geometry.hpp

I haven't evaluated it, yet, but perhaps we could make use of some
ideas there as well.

Best regards,
-- 
Mateusz  Loskot, http://mateusz.loskot.net