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Newsgroups: comp.lang.ada
Date: Wed, 25 Jan 2017 06:11:07 -0800 (PST)
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Subject: Re: Ada.Numerics.Long_Real_Arrays
From: hnptz@yahoo.de
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Xref: news.eternal-september.org comp.lang.ada:33161
Date: 2017-01-25T06:11:07-08:00
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On Wednesday, January 25, 2017 at 1:25:18 PM UTC+1, hn...@yahoo.de wrote:
> Hi,
> 
> these are my definitions:
> 
> with Ada.Numerics.Long_Real_Arrays; use Ada.Numerics.Long_Real_Arrays;
> package nm is
> 
> Np : Positive;
> Type R_Vector is new Real_Vector (1..Np);
> Type R_Matrix is array (Positive range <>) of R_Vector;
> 
> procedure nm1 (P : in out R_Matrix);
> 
> end nm;
> 
> -- definition of procedure nm1 in package body nm done.
> 
> now in procedure test_nm.adb (only definitions):
> 
> Np : Positive := 2;
> Mp : Positive := Np+1;
> 
> 24  P : R_Matrix(1..Mp) := ((x,x),(y,y),(z,z));
> 
> no "build all" error or warning
> 
> result when running:
> 
> raised CONSTRAINT_ERROR : test_nm.adb: 24 length check failed.
> 
> Can you help?

First, I want to keep the length of P open until I fix it in test_nm.adb. The length of R_Vector is always Mp-1.
Second, I want to use the builtin Real_Vector arithmetic, that I do not have to resort to loops. Using Real_Matrix definitions won't allow it, as slices of n-dimensional arrays are not possible.