Geometry Boost List: [geometry] Union clipping not working

Subject: [geometry] Union clipping not working
From: Hunk (heiko.hoennige_at_[hidden])
Date: 2013-10-22 05:40:05

Hello

I have two areas which you can see on the follow picture

<http://boost-geometry.203548.n3.nabble.com/file/n4025672/union_.png> 

As Points 

Blue:   
2.5 , 4 / 2.5 , 1 / 2 , 1 / 2 , 4 / 0,4 / 0,0 / 7,0 / 7,5 / 2,5 / 2 , 4
red:
2, 5 / 0 , 5 / 0 , 4 / 2,  4

i expect as solution the outside area 
0,0 7,0 7,4 0 ,4
and the obstacle inside

but the output polygon vector has only the size 1

0,4 / 0,0 / 7,0 /7,5 /0,5

but i dont understand why ...

is the problem the touch point(2,4) on polygon blue?

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