Re: Real_Arrays on heap with overloaded operators and clean syntax

[Jim Paloander <dhmos.altiotis@gmail.com>]

> >>>> Dear ADA lovers, 
> >>>> with stack allocation of Real_Vector ( 1 .. N ) when N >= 100,000 I 
> >>>> get STACK_OVERFLOW ERROR while trying to check how fast operator 
> >>>> overloading is working for an expression 
> >>>> 
> >>>> X := A + B + C + C + A + B, where 
> >>>> A,B,C,X are all Real_Vector ( 1 .. N ). 
> >>>> 
> >>>> So my only option was to allocate on the heap using new. But then I 
> >>>> lost the clean syntax 
> >>>> 
> >>>> X := A + B + C + C + A + B 
> >>>> 
> >>>> and I had to write instead: 
> >>>> 
> >>>> X.all := A.all + B.all + C.all + C.all + A.all + B.all. 
> >>>> 
> >>>> This is really ugly and annoying because when you are using 
> >>>> Real_Arrays for implementing some linear algebra method who relies 
> >>>> heavilly on matrix vector products and vector updates, you do need 
> >>>> to allocate on the heap (sizes are determined in runtime) and you do 
> >>>> need a clean syntax. So, is there any way to simplify my life 
> >>>> without using the .all or even without declaring A,B,C,X as access 
> >>>> Real_Vector? 
> >>>> Thanks for your time! 
> >>> If you are on linux, then you could set the stack size with 
> >>> 
> >>> $ ulimit -s unlimited 
> >>> $ launch_my_app 
> >>> 
> >>> 
> >>> 
> >>> Regards. 
> >> On Windows 10 with mingw64? 
> > 
> >    Not sure. I don't have a windows machine. 
> > 
> >    What happens when try ? 
> > 
> >       $ ulimit -a
> ulimit is available on cygwin. 
> 
> It is not available on mingw64 then ?
It is, but I am not sure if it works since -D400m -d400m together with ulimit were not able to solve the problem. So I thought that under windows 10 and mingw things related to stack size settings are not equivalent to Linux. I checked your repository. Looks good. We need some elegant solution, because sometimes it is not easy to predict the stack size that will be needed. Imagine you write a commercial application that is running from a GUI and the user loads a particular case from a file. The memory that will be needed may even exceed the available memory installed on the computer. There must be some elegant way to set the stack size globally. On the other hand storage pool seem that does not need deallocation. Isnt there any storage pool for stack based allocation so that you enjoy best of both worlds?