Geometry Boost List: [geometry] multiple polygon difference

Subject: [geometry] multiple polygon difference
From: Stefan Wörthmüller (stefanwoe_at_[hidden])
Date: 2013-10-30 07:09:04

Hello 

i am currently struggling with the process of subtracting 
small polygons from a larger polygon. None of the polygons have holes 
and all small polygones are completely covered by the larger polygone. 
Of course, the result will be a polygon with holes.

I first tried
 with boost 1.48, but as this resulted in compilation errors i now 
upgradet to 1.54 as i read in the release notes of 1.54:
>    support for line/polygon intersections and differences.

My code looks like this:

typedef boost::geometry::model::d2::point_xy<double> boost_pnt;
typedef boost::geometry::model::polygon<boost_pnt>   boost_poly;
boost_poly outputPoly = outerPolygon;
for(...)
{
    boost_poly innerPoly = ...;
    boost_poly new_output;
    boost::geometry::difference(outputPoly, innerPoly, new_output);
outputPoly = new_output;
}

Compiling thjs with VC2010 results in the line of difference
>D:\Develop\boost\boost_1_54_0\boost/range/iterator.hpp(63):
 error C2039: 'type' : is not a member of 
'boost::mpl::eval_if_c<C,F1,F2>'
1>          with
1>          [
1>             
 C=false,
1>              F1=boost::range_const_iterator<boost::geometry::model::polygon<boost_pnt>>,
1>              F2=boost::range_mutable_iterator<boost_poly>
1>          ]



etc.

So my understanding is, that difference() does not work with all parameters of type polygon. 

When using std::vector<boost_poly> as last parameter, difference 
compiles and works, but i see no way of converting this back to a 
polygon. 

I can not find a way to to distance in a loop.

Is there some way to solve this problem?

Regards,
Stefan