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From: Preben Randhol <randhol+news@pvv.org>
Newsgroups: comp.lang.ada
Subject: Re: Array and memory usage
Date: Sun, 9 Mar 2003 12:11:06 +0000 (UTC)
Organization: Norwegian university of science and technology
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John R. Strohm wrote:
> "Preben Randhol" <randhol+news@pvv.org> wrote in message
> news:slrnb6m8mg.15o.randhol+news@kiuk0152.chembio.ntnu.no...
>> I was a bit puzzeled to see that if I do:
>>
>>    type Str_Array_Type is array (1 .. 1000) of String (1 .. 800);
>>
>>    type User_Data is
>>       record
>>          Name     : Str_Array_Type;
>>          Hostname : Str_Array_Type;
>>       end record;
> 
> This declares two types and NO instances of those types.
> 
>> my program uses 800 bytes of memory, while if I only change the program
>> like this:
>>
>>    type User_Data is
>>       record
>>          Name     : Str_Array_Type := (others => (others => ' '));
>>          Hostname : Str_Array_Type := (others => (others => ' '));
>>       end record;
>>
>> then the program uses 2356 bytes.
> 
> This declares the same two types and TWO (2) implicit instances of
> Str_Array_Type, namely, the aggregate constants.  That's where the
> difference comes from.
> 

Ok but I also have a :

   User_Db : User_Data;

And if I use the first User_Data type then the memory usage only increases as
I add Names and Hostnames. I mean it doesn't go from 800 to 2356 as I
add one name, but slowly until all Names are added. This puzzeles me.

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