Hi Simon,
you don't need to modify the point class. You can simply pas to the
constructor of the set a comparator. See the first answer
in https://stackoverflow.com/questions/2620862/using-custom-stdset-comparator.
Hope this helps,
PM
On Sunday, 27 June 2021 at 12:15:40 UTC+2 Simon wrote:
> Dear all,
>
> I am trying to create a set of Points<dim>, i.e std::set<Point<dim>>.
> I get a quite extensive error message when trying to insert a point in the
> set but for my understanding of the message, the only problem is the
> missing operator< for two points.
> (Well I could make use of a std::vector instead but a std::set fits much
> better for my issue since (i) I need to insert points at arbitrary
> positions quite often and second (ii) wanna make sure that a given Point is
> only once in the container.)
>
> But irrespective of what container I use, I would like to supplement the
> Point Class by adding the 'operator<' like in the following:
>
> template<int dim, typename Number=double>
> bool Point<dim>::operator< (const Point<dim,Number>& p)
> {
> //...some Asserts
> return this.norm()<p.norm();
> }
>
> Of course I can not write this piece of code since there is no declaration
> for a member function 'operator<' in the Point Class.
> For that reasons my next idea was to modify the file <deal.II/base/point.h
> <https://www.dealii.org/current/doxygen/deal.II/base_2point_8h_source.html>>
> by simply adding the missing operator< declaration and the corresponding
> definition. So I did this but without effect, probably because all the
> files of the dealii-library are already compiled and executing my program
> via 'make run' did not see my changes in the Point Class at all. (I also
> added a dummy command, std::cout<<"...Test..."<<std::endl, which did not
> appear on my screen either.)
>
> I am only familiar with basic cmake- and make-commands.
> My question is if it is possible to recompile one specific file of the
> library again?
> So if this were possible I would appreciate getting some guidance for
> implementing this.
> I would also be interested in writing a patch for that issue.
>
> Best
> Simon
>
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