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Date: Mon, 19 Mar 2018 08:01:37 -0700 (PDT)
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Subject: Re: time of update of new values for out mode parameters
From: AdaMagica <christ-usch.grein@t-online.de>
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Xref: reader02.eternal-september.org comp.lang.ada:51069
Date: 2018-03-19T08:01:37-07:00
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Am Montag, 19. M=C3=A4rz 2018 13:21:08 UTC+1 schrieb Mehdi Saada:
> Hi.
>=20
> When are new values of out or in out mode parameters written in the actua=
l variable ? Is it instantaneous as I presume it is with access mode parame=
ters, or is it done at the end of the function/procedure/accept statement ?
>=20
> Mehdi

I see that you post a lot of questions which are easily answered ba y look =
in the RM. Please try to read it - you will get accustomed to its style.

To this actual question:

Ada doe not generally define how parameters are transferred. This is often =
left to the compiler who will do the correct choice.

Always transferred by copy (in, in out, out): scalar objects.
Always transferred by reference: tagged types, limited types.

Copy in: when the subprogram is called.
Copy out: when the subprogram is left correctly (not when left via an excep=
tion).