Geometry Boost List: [ggl] Strange behaviour on a sample

Subject: [ggl] Strange behaviour on a sample
From: Mateusz Loskot (mateusz)
Date: 2010-04-09 17:03:47

?????????????????? ???????????????????? wrote:
> Hi,
>
> I found a strange result on the following sample (complete code of the
> sample is attached). I tried to find intersection of two polygons:
>
>   {{42.0,-71.0}, {42.5,-71.0}, {42.5,-72.0}, {42.0,-72.0}}
>
> and
>
>   {{42.35,-71.04}, {42.34,-71.04},{42.34,-71.03},{42.35,-71.03}}
>
> It easy to see that the first one includes the second. But result of
> this operation is an empty set of polygons.
>
>
> Environment:
>
> boost-geometry: br59805 | barendgehrels | 2010-02-21 14:43:54 +0500
> (??????, 21 ?????? 2010) | 2 lines
> g++ (Ubuntu 4.4.1-4ubuntu9) 4.4.1
> Intel(R) Core(TM) i5 CPU 750 @ 2.67GHz

I use the same compiler but on Ubuntu 9.10 x64 and I tried to compile
your sample.cpp using default Boost.Build flags:

$ g++ -ftemplate-depth-128 -O0 -fno-inline -Wall -pedantic -g -fPIC
-pedantic -pedantic -Wall -Wstrict-aliasing -fstrict-aliasing -Wno-long-long

The program itself compiles, but I found a tiny issue
in r61168 in file geometry/multi/algorithms/dissolve.hpp.

I committed fix:
https://svn.boost.org/trac/boost/changeset/61169

Could you please try to svn update and check if your sample compiles?

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