Hi Barend, thanks for the reply. As I understand it the algorithm is not that simple but I would be happy to find out I am wrong. The requirements I have are that the "seams" cannot cut through any holes, the connect_holes algorithm does prevent seams crossing holes this but may have to create new vertices for seam "take-offs" to travel to other holes. I have tried using the QPolygon class in Qt, it has an simple implementation that just iterates around all the holes but can lead to seams crossing holes (or seams going out of the boundary of the outer polygon). Do you think an easy solution exists given these requirements? Dan -----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of boost-users-request@lists.boost.org Sent: Wednesday, June 16, 2010 9:45 AM To: boost-users@lists.boost.org Subject: Boost-users Digest, Vol 2392, Issue 2 Send Boost-users mailing list submissions to boost-users@lists.boost.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.boost.org/mailman/listinfo.cgi/boost-users or, via email, send a message with subject or body 'help' to boost-users-request@lists.boost.org You can reach the person managing the list at boost-users-owner@lists.boost.org When replying, please edit your Subject line so it is more specific than "Re: Contents of Boost-users digest..." Today's Topics: 1. Connect holes in polygon (Macumber, Daniel) 2. Re: config / cygwin question (Steven Watanabe) 3. Re: boost.xpressive: using placeholders with custom (check()) assertions (Eric Niebler) 4. Re: Connect holes in polygon (Barend Gehrels) 5. Re: [boost] [log] Link error with trivial logging (Roger Stewart) 6. Re: config / cygwin question (Fr?d?ric Bron) 7. Re: [Serialization] Sometimes Fails Reading Binary File (Robert McCullough) 8. Re: [Serialization] Sometimes Fails Reading Binary File (Steven Watanabe) 9. Re: [Serialization] Sometimes Fails Reading Binary File (Robert McCullough) ---------------------------------------------------------------------- Message: 1 Date: Wed, 16 Jun 2010 06:07:15 -0600 From: "Macumber, Daniel" <Daniel.Macumber@nrel.gov> To: "boost-users@lists.boost.org" <boost-users@lists.boost.org> Subject: [Boost-users] Connect holes in polygon Message-ID: <07186B30C3DFE948B0EE2862AC1999F70A5B89E426@MAILBOX2.nrel.gov> Content-Type: text/plain; charset="us-ascii" Does anyone know how to use boost Polygon or boost GGL to take a convert a polygon with holes to a polygon with no holes? I am looking for functionality similar to this http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/Boolean_set_operations_2.... I have already found a way to extract trapezoids using boost Polygon but I was hoping there was a method more similar to connect_holes. Thanks a lot, Dan ------------------------------ Message: 2 Date: Wed, 16 Jun 2010 06:22:02 -0700 From: Steven Watanabe <watanabesj@gmail.com> To: boost-users@lists.boost.org Cc: Rene Rivera <grafikrobot@gmail.com> Subject: Re: [Boost-users] config / cygwin question Message-ID: <4C18CFFA.7010902@providere-consulting.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed AMDG Fr?d?ric Bron wrote:

# Uploading log archive "/cygdrive/d/boost_regression/cygwin/results/bronf-cygwin-1.7.zip" to ftp://anonymous@boost.cowic.de/boost/do-not-publish-this-url/results//trunk

Rene, I think you're going to have to change this again. In Christ, Steven Watanabe ------------------------------ Message: 3 Date: Wed, 16 Jun 2010 09:29:38 -0400 From: Eric Niebler <eric@boostpro.com> To: boost-users@lists.boost.org Subject: Re: [Boost-users] boost.xpressive: using placeholders with custom (check()) assertions Message-ID: <4C18D1C2.6010208@boostpro.com> Content-Type: text/plain; charset=ISO-8859-1 On 6/16/2010 3:04 AM, Alex Dubov wrote:

Greetings.

Xpressive allows the use of object placeholders in semantic actions, which are being replaced by actual object references during the match, like in this simple example:

placeholder<string> p_string; sregex r = (expr)[do_something(p_string, _)];

When executed, do_something() functor will receive a reference to string, as expected.

However, if functor is wrapped with assertion, this won't work:

sregex r = (expr)[check(do_something(p_string, _))];

Compilation will fail, because do_something has no method which accepts xpressive::placeholder<> objects.

It should if it is a lazy function. How is do_something defined? Can you send a self-contained program that demonstrates the problem you're having?

And even if such method was to be added, there's no obvious way to obtain a run-time reference to actual object out of placeholder.

xpressive will do that for you.

This leads to some question: 1. Is there any trick allowing to use placeholders within check() assertions? 2. Alternatively, may there be a way to declare a semantic action functor, returning bool, in such a way, that it will act as custom assertion? It seems to me, that some cunning trick involving boost::proto construct may exist, even though I can't think of any particular way to do so.

In light of the above, I also thought about sort of feature request: 3. Sometimes, custom assertion applies only to a part of the match, something like:

*((expr)[check(cond)] | _)

That is, a desire is to consume everything, until some specific "expr" token matches a precondition.

Yes, that should work.

However, raised assertion will not stop the matching, because it only applies to one branch of the regexp. It could be very handy if there was a way to signal from assertion that a larger containing expression matched it results.

I don't understand that last sentence. Can you clarify? -- Eric Niebler BoostPro Computing http://www.boostpro.com ------------------------------ Message: 4 Date: Wed, 16 Jun 2010 15:59:12 +0200 From: Barend Gehrels <barend@geodan.nl> To: boost-users@lists.boost.org Subject: Re: [Boost-users] Connect holes in polygon Message-ID: <4C18D8B0.7060902@geodan.nl> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Hi Dan, Macumber, Daniel wrote:

Does anyone know how to use boost Polygon or boost GGL to take a convert a polygon with holes to a polygon with no holes? I am looking for functionality similar to this http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/Boolean_set_operations_2.... I have already found a way to extract trapezoids using boost Polygon but I was hoping there was a method more similar to connect_holes.

As also described on the GGL-mailing list:

No, Boost.Geometry does not (yet) provide conversion from polygons with holes to so-called key-holed polygons as you describe. Normally this is necessary or useful for graphic user interfaces. The algorithm is not that difficult, visiting the outer polygon and after that the inner rings, while pushing the first point of the outer polygon between all inner rings, is normally enough. This can be done by normal iterators.

Regards, Barend ------------------------------ Message: 5 Date: Wed, 16 Jun 2010 10:00:20 -0400 From: "Roger Stewart" <rstewart@noregon.com> To: <boost-users@lists.boost.org> Subject: Re: [Boost-users] [boost] [log] Link error with trivial logging Message-ID: <A9BF6EA2DF78AB47A87CC2A0F55437FA014A4831@mail2003.noregon.com> Content-Type: text/plain; charset="utf-8"

-----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users- bounces@lists.boost.org] On Behalf Of Igor R Sent: Wednesday, June 16, 2010 3:56 AM To: boost-users@lists.boost.org Subject: Re: [Boost-users] [boost] [log] Link error with trivial logging

...

libboost_log-vc80-mt-sgd-1_43.lib(trivial.obj) : error LNK2019: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::get_system_category(void)" (?get_system_category@system@boost@@YAABVerror_category@12@XZ) referenced in function "void __cdecl boost::system::`dynamic initializer for 'system_category''(void)" (??__Esystem_category@system@boost@@YAXXZ)

Any thoughts on what might be causing this? ?Below is my main(). ?Thanks!

Do you have libboost_system-vc80-mt-sgd-1_43.lib ? This lib should be linked as well. _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

I am using msvc90 with boost 1.43 and receive the same linking errors when compiling a simple trivial console project. I can get the project to link successfully if I include a backend sink, i.e.: #include <boost/log/sinks/text_file_backend.hpp> This bug can be verified by declaring #define BOOST_LIB_DIAGNOSTIC and watching which libs get pulled in for linking when including or commenting out text_file_backend.hpp. Roger S. ------------------------------ Message: 6 Date: Wed, 16 Jun 2010 16:37:57 +0200 From: Fr?d?ric Bron <frederic.bron@m4x.org> To: boost-users@lists.boost.org Cc: Rene Rivera <grafikrobot@gmail.com> Subject: Re: [Boost-users] config / cygwin question Message-ID: <AANLkTinaBs96oAkTOtfqmBoUpQJlfce3XnOKbSsFnkvK@mail.gmail.com> Content-Type: text/plain; charset="iso-8859-1"

...

# Uploading log archive "/cygdrive/d/boost_regression/cygwin/results/bronf-cygwin-1.7.zip" to

ftp://anonymous@...

Rene, I think you're going to have to change this again.

Oh! I am terribly sorry for this mistake. May I propose the attached patch so that this will never happen again. Regards, Fr?d?ric