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From: Brian Drummond <brian@shapes.demon.co.uk>
Newsgroups: comp.lang.ada
Subject: Re: Experimenting with the OOP features in Ada
Date: Tue, 3 Jan 2017 12:48:21 -0000 (UTC)
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Date: 2017-01-03T12:48:21+00:00
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On Mon, 02 Jan 2017 08:05:18 -0800, Laurent wrote:

> On Monday, 2 January 2017 15:44:57 UTC+1, Brian Drummond  wrote:

>> Test_Antibiotic := Base_Types.Antibiotics.Create_Code_SIL (
>>                              This => Test_Antibiotic, Code_SIL => "Test
>>                              Antibiotic 3")
>> 
>> Test_Antibiotic := Test_Antibiotic.Create_Code_SIL
>>                             (Code_SIL => "Test Antibiotic 3");
>> 
>> but the preferred form would be
>> 
>> Test_Antibiotic.Set_Code_SIL (Code_SIL => "gen");
>> 
>> -- Brian
> 
> Probably your versions does what I couldn't figure out. I declared Item
> inside the function not as parameter.
> But would that cause a constraint error?

If you try to access "Name" of an object that was created without a 
"Name", yes it would. 

I didn't dig deep enough into your constructors to see if that was 
genuinely the case or if they were created with some default, but the 
constraint error was clear enough evidence for me. I find Ada very good 
at catching mistakes early instead of burying them in non-obvious 
behaviour.

-- Brian