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From: Jeffrey Carter <spam.jrcarter.not@spam.not.acm.org>
Newsgroups: comp.lang.ada
Subject: Re: Generics crash course
Date: Thu, 15 Jan 2015 23:27:19 -0700
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Date: 2015-01-15T23:27:19-07:00
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On 01/15/2015 10:43 PM, Niklas Holsti wrote:
> 
>    type Element_Type is private;
> 
> says that Search depends on a type with the formal name Element_Type,
> but that Search assumes very little about the nature of the type, because it is
> defined as "private". The actual type could be an integer, a float, a record, an
> array (of fixed size), ...

It says the actual must have assignment and "=" defined.

>   type Index_Type is range <>;
> 
> says that Search also depends on a type with the formal name Index_Type, and
> that Search assumes that this type is a "discrete" type such as an integer type
> or an enumeration type.

This says the actual must be a signed integer type. A generic formal type that
can be any discrete type is "(<>)".

> By the way, all the "return" statements in the example (lines 68, 142, 155) are
> superfluous, because a subprogram returns when its "end" is reached.

A procedure returns when its "end" is reached. A function, which is also a
subprogram, raises Program_Error if it reaches its "end".

-- 
Jeff Carter
"Mr. President, we must not allow a mine-shaft gap!"
Dr. Strangelove
33