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Newsgroups: comp.lang.ada
Date: Sun, 22 Jan 2023 13:56:27 -0800 (PST)
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Subject: Re: Real_Arrays on heap with overloaded operators and clean syntax
From: Joakim Strandberg <joakimds@kth.se>
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Xref: reader01.eternal-september.org comp.lang.ada:64848
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s=C3=B6ndag 22 januari 2023 kl. 22:34:19 UTC+1 skrev dhmos.a...@gmail.com:
> Dear ADA lovers,=20
> with stack allocation of Real_Vector ( 1 .. N ) when N >=3D 100,000 I get=
 STACK_OVERFLOW ERROR while trying to check how fast operator overloading i=
s working for an expression=20
>=20
> X :=3D A + B + C + C + A + B, where=20
> A,B,C,X are all Real_Vector ( 1 .. N ).=20
>=20
> So my only option was to allocate on the heap using new. But then I lost =
the clean syntax=20
>=20
> X :=3D A + B + C + C + A + B=20
>=20
> and I had to write instead:=20
>=20
> X.all :=3D A.all + B.all + C.all + C.all + A.all + B.all.=20
>=20
> This is really ugly and annoying because when you are using Real_Arrays f=
or implementing some linear algebra method who relies heavilly on matrix ve=
ctor products and vector updates, you do need to allocate on the heap (size=
s are determined in runtime) and you do need a clean syntax. So, is there a=
ny way to simplify my life without using the .all or even without declaring=
 A,B,C,X as access Real_Vector?=20
> Thanks for your time!

Easiest solution is probably to declare a new task and specify the stack si=
ze using the Storage_Size aspect. Allocate as much stack space as you need =
to be able to do the calculations and do all the allocations on the declare=
d task, not on the environment task. You will avoid the unnecessary heap al=
locations and have nice clean syntax.

Best regards,
Joakim