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From: eachus@spectre.mitre.org (Robert I. Eachus)
Subject: Re: Any research putting c above ada?
Date: 1997/04/21
Message-ID: <EACHUS.97Apr21122141@spectre.mitre.org>#1/1
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References: <5ih6i9$oct$1@waldorf.csc.calpoly.edu>
 <5j078b$b25$1@NNTP.MsState.Edu> <335458A4.4C1D@worldnet.att.net>
 <5j416b$hau@mtinsc04.worldnet.att.net> <3357B132.3281@us.net>
 <5j9287$omc@mtinsc02.worldnet.att.net>
Organization: The Mitre Corp., Bedford, MA.
Newsgroups: comp.lang.c++,comp.lang.c,comp.lang.ada
Date: 1997-04-21T00:00:00+00:00
List-Id: <comp.lang.ada>



In article <5j9287$omc@mtinsc02.worldnet.att.net> Craig Franck <clfranck@worldnet.att.net> writes:

  > Are they portable add-ons? I understand that an Ada implementation
  > must provide (Cohen 1986) four packages: IO_Exceptions, Text_IO,
  > Sequential_IO, and Direct_IO. That is it.

  Never not, even for Ada 83.  Those are the required Ada 83 IO
library units.  Others included Calendar, Unchecked_Conversion, etc.

  > When "The Long and Winding Road" to standardization is at its end,
  > C++ will offer a virtual zoo of functionality; C already offers a
  > good bit and C++ piles even more *portable* functionality onto
  > that. In C and C++ the entire standard library is part of the
  > language.

   In Ada 95, there is an extensive required library.  To quote Annex
A paragraph 1:

   "This Annex contains the specifications of library units that shall
be provided by every implementation.  There are three root library
units: Ada, Interfaces, and System; other library units are children
of these."  It then lists 67 library units, 19 of which are required
only of implementations that support some or all of the specialized
needs annexes.  To give you a flavor, Elementary_Functions and
Command_Line are required, but Complex_Elementary_Functions and RPC
are in specialized annexes.  (For those of you out there who are nit
pickers, there are some packages, such as Machine_Code, where the
applicable annex requires access to the functionality but allows that
to be through package machine code or compiler intrinsics.)

--

					Robert I. Eachus

with Standard_Disclaimer;
use  Standard_Disclaimer;
function Message (Text: in Clever_Ideas) return Better_Ideas is...