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Re: Terminology - RAII vs. Scope Guard vs...?

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NNTP-Posting-Date Thu, 12 Apr 2012 12:18:12 -0500
From Gareth Owen <gwowen@gmail.com>
Newsgroups comp.lang.c++
Subject Re: Terminology - RAII vs. Scope Guard vs...?
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Juha Nieminen <nospam@thanks.invalid> writes:

>   The wikipedia page also seems to assume that RAII is just about scope-based
> construction and destruction of objects, as indicated for example by giving
> the gcc extension "cleanup" variable attribute as an example on how to
> emulate RAII in C. However, it's not just about construction and destruction
> of objects. One extremely important part of RAII is copying (both in the
> form of copy constructors and assignment operators).

I don't think that's an unreasonable distinction. Clearly, copying
semantics have to be well defined for any RAII-like
resource-management-through-ownership idiom/scheme/philosophy to work,
but you don't need C++ copy/assignment.

You could define 

* a language that forces copyable object to have a java-like
  user-provided clone() for all objects, and no implicit copying or
  assignment for user defined types (just as many C++ polymorphic
  classes do)
* or a language where every object acted like std::shared_ptr 
* or even (god forbid) a language where every object acted like
  std::auto_ptr

and still have RAII, just as long as you had destruction when the last
reference vanished.

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Thread

Terminology - RAII vs. Scope Guard vs...? Noah Roberts <roberts.noah@gmail.com> - 2012-04-10 13:47 -0700
  Re: Terminology - RAII vs. Scope Guard vs...? Joshua Maurice <joshuamaurice@gmail.com> - 2012-04-10 14:36 -0700
    Re: Terminology - RAII vs. Scope Guard vs...? Noah Roberts <roberts.noah@gmail.com> - 2012-04-11 09:10 -0700
      Re: Terminology - RAII vs. Scope Guard vs...? Joshua Maurice <joshuamaurice@gmail.com> - 2012-04-11 12:28 -0700
        Re: Terminology - RAII vs. Scope Guard vs...? Noah Roberts <roberts.noah@gmail.com> - 2012-04-11 13:29 -0700
          Re: Terminology - RAII vs. Scope Guard vs...? Rui Maciel <rui.maciel@gmail.com> - 2012-04-12 02:29 +0100
          Re: Terminology - RAII vs. Scope Guard vs...? Joshua Maurice <joshuamaurice@gmail.com> - 2012-04-12 14:31 -0700
            Re: Terminology - RAII vs. Scope Guard vs...? Noah Roberts <roberts.noah@gmail.com> - 2012-04-12 16:48 -0700
              Re: Terminology - RAII vs. Scope Guard vs...? "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2012-04-13 02:34 +0200
                Re: Terminology - RAII vs. Scope Guard vs...? Miles Bader <miles@gnu.org> - 2012-04-13 10:57 +0900
                Re: Terminology - RAII vs. Scope Guard vs...? "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2012-04-13 09:52 +0200
                Re: Terminology - RAII vs. Scope Guard vs...? Rui Maciel <rui.maciel@gmail.com> - 2012-04-13 10:48 +0100
                Re: Terminology - RAII vs. Scope Guard vs...? Miles Bader <miles@gnu.org> - 2012-04-13 22:18 +0900
                Re: Terminology - RAII vs. Scope Guard vs...? Noah Roberts <roberts.noah@gmail.com> - 2012-04-13 09:21 -0700
        Re: Terminology - RAII vs. Scope Guard vs...? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-04-11 21:36 +0000
          Re: Terminology - RAII vs. Scope Guard vs...? Noah Roberts <roberts.noah@gmail.com> - 2012-04-11 16:07 -0700
            Re: Terminology - RAII vs. Scope Guard vs...? Juha Nieminen <nospam@thanks.invalid> - 2012-04-12 06:10 +0000
              Re: Terminology - RAII vs. Scope Guard vs...? Gareth Owen <gwowen@gmail.com> - 2012-04-12 18:18 +0100
                Re: Terminology - RAII vs. Scope Guard vs...? Juha Nieminen <nospam@thanks.invalid> - 2012-04-13 04:52 +0000
                Re: Terminology - RAII vs. Scope Guard vs...? Gareth Owen <gwowen@gmail.com> - 2012-04-13 06:59 +0100
                Never using free() or realloc().  Destroying heaps.  @Jeff-Relf.Me - 2012-04-13 00:55 -0700
      Re: Terminology - RAII vs. Scope Guard vs...? Rui Maciel <rui.maciel@gmail.com> - 2012-04-11 21:28 +0100
        Re: Terminology - RAII vs. Scope Guard vs...? Noah Roberts <roberts.noah@gmail.com> - 2012-04-11 13:40 -0700
          Re: Terminology - RAII vs. Scope Guard vs...? Rui Maciel <rui.maciel@gmail.com> - 2012-04-12 02:27 +0100
            Re: Terminology - RAII vs. Scope Guard vs...? scott@slp53.sl.home (Scott Lurndal) - 2012-04-12 17:25 +0000
              Re: Terminology - RAII vs. Scope Guard vs...? Gareth Owen <gwowen@gmail.com> - 2012-04-12 19:21 +0100
            Re: Terminology - RAII vs. Scope Guard vs...? Noah Roberts <roberts.noah@gmail.com> - 2012-04-12 16:38 -0700
              Re: Terminology - RAII vs. Scope Guard vs...? Rui Maciel <rui.maciel@gmail.com> - 2012-04-13 11:02 +0100
          Re: Terminology - RAII vs. Scope Guard vs...? nick_keighley_nospam@hotmail.com - 2012-04-13 00:29 -0700
      Re: Terminology - RAII vs. Scope Guard vs...? nick_keighley_nospam@hotmail.com - 2012-04-13 00:14 -0700

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