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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