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Subject: Re: [geometry] Adaption of legcay hierarchy to Boost.Geometry model
From: Mats Taraldsvik (mats.taraldsvik_at_[hidden])
Date: 2013-03-02 10:40:40

Hi all,

On 02/09/2013 01:38 PM, Barend Gehrels wrote:
> Hi Mihis,
> On 8-2-2013 8:57, ???? ??????? wrote:
>> OK, it seems that I have found answer for this question.
>> In/linestring_concept.hpp/. it's mentioned that besides
>> specialization of traits::tag and and lifting of Boost.Range Random
>> Access concepts custom linestring class
>> also must "implement std::back_insert_iterator either by implementing
>> push_back or by specializing
>> std::back_insert_iterator". The same if for the Ring Concept. I
>> really can't understand how to "specialize
>> std::back_insert_iterator" but it seems to me that this phrase means
>> the necessity of specialization of
>> structs *resize*, *push_back* and *clear* from /mutable_range.hpp/,
>> which are used by *append* and *assign* algorithms.
>> I have not tested this solution yet but it seems to be right taking
>> in account that Boost.Polygon data structures
>> are adapted to Ring and Polygon Concepts in the same way.
> Sorry for my late answer on this. Indeed the "mutable range" should be
> used / specialized for these operations. So the linestring itself can
> stay as it is.
> In another mail you referred to the solution about legacy classes,
> that was in cooperation with Mats who did the basics this adaption, I
> contributed only small tests and additions there.

I'm sorry for the late answer -- this email slipped through,
unfortunately. As Barend said, I am working on adapting a legacy data
structure, and I am also documenting the procedure, and hoping to
contribute this to the official Boost.Geometry documentation. :)

The adaption is currently only non-mutating, but once the non-mutating
adaption process is documented and the documentation is merged, I hope
to extend to mutating algorithms as well.


> Regards, Barend
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