Re: use Ada.Text_IO in main() or Package?

[gautier_niouzes@hotmail.com]

Le jeudi 14 septembre 2017 11:37:41 UTC+2, Mace Ayres a écrit :
> Tks. It does make sense. I haven't been programming much in last decades, never really go into OOP much, but I can see this is going to avoid a lot of issues, and enforces some rigor.

Actually it is just a question of what is depending on what.
Instead of Structures, you can take Ada.Text_IO itself as an example.
In the guts of package Ada.Text_IO, the GNAT run-time library has a package body file: a-textio.adb) with the following lines:

    with Ada.Streams;             use Ada.Streams;
    with Interfaces.C_Streams;    use Interfaces.C_Streams;

    with System.File_IO;
    with System.CRTL;
    with System.WCh_Cnv;          use System.WCh_Cnv;
    with System.WCh_Con;          use System.WCh_Con;

    with Ada.Unchecked_Conversion;
    with Ada.Unchecked_Deallocation;

It makes sense they are there and not expected to be in any Main() or any other referencing Ada.Text_IO.
I've never used System.File_IO for instance and would not: it is GNAT only and unknown in other Ada systems. And there is no need for that.
G.