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Gtkmm-forge Digest, Vol 33, Issue 8

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Today's Topics:

   1. [Bug 511136] TreeView::get_cursor() may return an	invalid
      TreePath instance (gtkmm (bugzilla.gnome.org))
   2. [Bug 511136] TreeView::get_cursor() may return an	invalid
      TreePath instance (gtkmm (bugzilla.gnome.org))
   3. [Bug 511136] TreeView::get_cursor() may return an	invalid
      TreePath instance (gtkmm (bugzilla.gnome.org))
   4. [Bug 571700] New: Compilation warnings with gcc 4.4
      (glibmm (bugzilla.gnome.org))
   5. [Bug 571837] New: snprintf used without declaration
      (gnomemm (bugzilla.gnome.org))
   6. [Bug 571837] snprintf used without declaration
      (gnomemm (bugzilla.gnome.org))
   7. [Bug 571838] New: geglbuffer-clock.cc compiles	with warnings
      (gnomemm (bugzilla.gnome.org))


----------------------------------------------------------------------

Message: 1
Date: Thu, 12 Feb 2009 16:02:44 +0000 (UTC)
From: "gtkmm (bugzilla.gnome.org)"
	<bugzilla-daemon bugzilla gnome org>
Subject: [gtkmm bugzilla] [Bug 511136] TreeView::get_cursor() may
	return an	invalid TreePath instance
To: gtkmm-forge lists sourceforge net
Message-ID: <20090212160244 0EBB423F51E label gnome org>
Content-Type: text/plain; charset=utf-8

If you have any questions why you received this email, please see the text at
the end of this email. Replies to this email are NOT read, please see the text
at the end of this email. You can add comments to this bug at:
  http://bugzilla.gnome.org/show_bug.cgi?id=511136

  gtkmm | TreeView | Ver: 2.12.x




------- Comment #9 from Murray Cumming  2009-02-12 16:02 UTC -------
> TreePath does not, in any way, represent a pointer or pointer-like data
> structure. It isn't a handle. The interface is that of an STL container. Also,
> there is no need to make a distinction between an invalid TreePath and an empty
> one.

We don't make a distinction. We do say that a (internally) invalid one is as
useless as an empty one. As far as I know there is know, and empty TreePath has
no meaning other than, "no path".

A std::vector can be empty too. It doesn't have operator bool() for that. Are
you saying that you'd be happy with just making empty() check for an null
gobj()?

> Eeek, no. Output parameters are a horrible last resort. And having such an
> overload *in addition* to some other means to represent that state is just
> ugly.

I'm not sure anymore what you actually want. 


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------------------------------

Message: 2
Date: Thu, 12 Feb 2009 16:48:17 +0000 (UTC)
From: "gtkmm (bugzilla.gnome.org)"
	<bugzilla-daemon bugzilla gnome org>
Subject: [gtkmm bugzilla] [Bug 511136] TreeView::get_cursor() may
	return an	invalid TreePath instance
To: gtkmm-forge lists sourceforge net
Message-ID: <20090212164817 0648623F51E label gnome org>
Content-Type: text/plain; charset=utf-8

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at the end of this email. You can add comments to this bug at:
  http://bugzilla.gnome.org/show_bug.cgi?id=511136

  gtkmm | TreeView | Ver: 2.12.x




------- Comment #10 from Daniel Elstner  2009-02-12 16:48 UTC -------
(In reply to comment #9)
> We don't make a distinction. We do say that a (internally) invalid one is as
> useless as an empty one. As far as I know there is know, and empty TreePath has
> no meaning other than, "no path".

But it is still a valid container in one case but not in another.

So why have two internal states to say the same thing?

> A std::vector can be empty too. It doesn't have operator bool() for that.

But std::vector::empty() does not attempt to handle the situation where the
vector object is corrupted and in an invalid state.

> Are
> you saying that you'd be happy with just making empty() check for an null
> gobj()?

Er, no. That's how it is right now.

    bool TreePath::empty() const
    {
      if(!gobject_)
        return false;

      return (gtk_tree_path_get_depth(gobject_) == 0);
    }

> I'm not sure anymore what you actually want.

Ditch the check for NULL and operator bool(), and custom-code
TreeView::get_cursor() to return an empty but valid path if the GTK+ function
returns NULL.


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------------------------------

Message: 3
Date: Fri, 13 Feb 2009 18:17:03 +0000 (UTC)
From: "gtkmm (bugzilla.gnome.org)"
	<bugzilla-daemon bugzilla gnome org>
Subject: [gtkmm bugzilla] [Bug 511136] TreeView::get_cursor() may
	return an	invalid TreePath instance
To: gtkmm-forge lists sourceforge net
Message-ID: <20090213181703 CFB6023F520 label gnome org>
Content-Type: text/plain; charset=utf-8

If you have any questions why you received this email, please see the text at
the end of this email. Replies to this email are NOT read, please see the text
at the end of this email. You can add comments to this bug at:
  http://bugzilla.gnome.org/show_bug.cgi?id=511136

  gtkmm | TreeView | Ver: 2.12.x




------- Comment #11 from Daniel Elstner  2009-02-13 18:17 UTC -------
OK.  Murray and I discussed the problem on IRC.  We agreed on removing operator
bool() again, and making sure that the object is never in an invalid state to
begin with.  However, this should be done in a generic way and therefore needs
to go into the constructor.

Unfortunately the constructor is auto-generated, and it is not possible to
easily override the autogeneration. For this reason this won't be a quick fix,
unfortunately, but will have to wait until someone finds the time to add
another exception flag to gmmproc to suppress the autogeneration of the
constructor.

However, the removal of operator bool() doesn't have to wait until then.  In
fact, it needs to be removed before the API freeze, so I'll do it right now.


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------------------------------

Message: 4
Date: Sat, 14 Feb 2009 06:40:36 +0000 (UTC)
From: "glibmm (bugzilla.gnome.org)"
	<bugzilla-daemon bugzilla gnome org>
Subject: [gtkmm bugzilla] [Bug 571700] New: Compilation warnings with
	gcc 4.4
To: gtkmm-forge lists sourceforge net
Message-ID: <bug-571700-5595 http bugzilla gnome org/>
Content-Type: text/plain; charset=utf-8

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  glibmm | build | Ver: 2.19.x
           Summary: Compilation warnings with gcc 4.4
           Product: glibmm
           Version: 2.19.x
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: Normal
         Component: build
        AssignedTo: gtkmm-forge lists sourceforge net
        ReportedBy: denis poolshark org
         QAContact: gtkmm-forge lists sourceforge net
     GNOME version: Unspecified
   GNOME milestone: Unspecified


We're seeing compile warnings with g++ 4.4, coming from refptr.h:

/usr/include/glibmm-2.4/glibmm/refptr.h: In constructor
?WinMain::WinMain(bool)?:
/usr/include/glibmm-2.4/glibmm/refptr.h:172: warning: dereferencing pointer
?<anonymous>? does break strict-aliasing rules
/usr/include/glibmm-2.4/glibmm/refptr.h:285: warning: dereferencing pointer
?<anonymous>? does break strict-aliasing rules
/usr/lib/gcc/i386-redhat-linux/4.4.0/../../../../include/c++/4.4.0/bits/stl_list.h:219:
note: initialized from here
/usr/include/glibmm-2.4/glibmm/refptr.h: In constructor
?WinMain::WinMain(bool)?:
/usr/include/glibmm-2.4/glibmm/refptr.h:172: warning: dereferencing pointer
?<anonymous>? does break strict-aliasing rules
/usr/include/glibmm-2.4/glibmm/refptr.h:285: warning: dereferencing pointer
?<anonymous>? does break strict-aliasing rules
/usr/lib/gcc/i386-redhat-linux/4.4.0/../../../../include/c++/4.4.0/bits/stl_list.h:219:
note: initialized from here


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------------------------------

Message: 5
Date: Sun, 15 Feb 2009 15:12:17 +0000 (UTC)
From: "gnomemm (bugzilla.gnome.org)"
	<bugzilla-daemon bugzilla gnome org>
Subject: [gtkmm bugzilla] [Bug 571837] New: snprintf used without
	declaration
To: gtkmm-forge lists sourceforge net
Message-ID: <bug-571837-5595 http bugzilla gnome org/>
Content-Type: text/plain; charset=utf-8

If you have any questions why you received this email, please see the text at
the end of this email. Replies to this email are NOT read, please see the text
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  http://bugzilla.gnome.org/show_bug.cgi?id=571837

  gnomemm | geglmm | Ver: unspecified
           Summary: snprintf used without declaration
           Product: gnomemm
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: geglmm
        AssignedTo: gtkmm-forge lists sourceforge net
        ReportedBy: dodji seketeli org
         QAContact: gtkmm-forge lists sourceforge net
     GNOME version: Unspecified
   GNOME milestone: Unspecified


There is a missing #include <cstdio> in the hello-world.cc that makes snprintf
be used without declaration. This is an error with gcc 4.4.


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------------------------------

Message: 6
Date: Sun, 15 Feb 2009 15:13:05 +0000 (UTC)
From: "gnomemm (bugzilla.gnome.org)"
	<bugzilla-daemon bugzilla gnome org>
Subject: [gtkmm bugzilla] [Bug 571837] snprintf used without
	declaration
To: gtkmm-forge lists sourceforge net
Message-ID: <20090215151305 CBEC823F51E label gnome org>
Content-Type: text/plain; charset=utf-8

If you have any questions why you received this email, please see the text at
the end of this email. Replies to this email are NOT read, please see the text
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  http://bugzilla.gnome.org/show_bug.cgi?id=571837

  gnomemm | geglmm | Ver: unspecified




------- Comment #1 from dodji seketeli  2009-02-15 15:13 UTC -------
Created an attachment (id=128776)
 --> (http://bugzilla.gnome.org/attachment.cgi?id=128776&action=view)
Fixes the problem


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------------------------------

Message: 7
Date: Sun, 15 Feb 2009 15:15:02 +0000 (UTC)
From: "gnomemm (bugzilla.gnome.org)"
	<bugzilla-daemon bugzilla gnome org>
Subject: [gtkmm bugzilla] [Bug 571838] New: geglbuffer-clock.cc
	compiles	with warnings
To: gtkmm-forge lists sourceforge net
Message-ID: <bug-571838-5595 http bugzilla gnome org/>
Content-Type: text/plain; charset=utf-8

If you have any questions why you received this email, please see the text at
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  http://bugzilla.gnome.org/show_bug.cgi?id=571838

  gnomemm | geglmm | Ver: unspecified
           Summary: geglbuffer-clock.cc compiles with warnings
           Product: gnomemm
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: geglmm
        AssignedTo: gtkmm-forge lists sourceforge net
        ReportedBy: dodji seketeli org
         QAContact: gtkmm-forge lists sourceforge net
     GNOME version: Unspecified
   GNOME milestone: Unspecified


geglbuffer-clock.cc has some unused variables that lead to gcc emitting
warnings at compile time.


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------------------------------

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