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From: R Daneel Olivaw <Danny@hyperspace.vogon.gov>
Newsgroups: comp.lang.fortran
Subject: Re: Is there a way in Fortran to designate an integer value as
 integer*8 ?
Date: Sun, 13 Oct 2024 14:47:43 +0200
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Thomas Koenig wrote:
> Lynn McGuire <lynnmcguire5@gmail.com> schrieb:
> 
>> I have 197 common blocks included from dedicated files and a massive
>> number of equivalences all over the place.  Several of the equivalences
>> are actually in the common block files.  The equivalences have made the
>> eventual C++ conversion of the Fortran code tricky.
> 
> What do you use the equivalences for?  Saving memory? Then this
> should not be a large issue on modern machines.
> 
> If you are using them for tricks with type conversion, then you
> are on thin ice already, and have been since Fortran 66.
> 
> And if you have a few big arrays, then changing those to ALLOCATABLE
> and allocating them at runtime might well be straightforward.
> 

Equivalences are an effective way of building data structures, you can 
do that with Common as well but sometimes equivalence is more suitable.