soft and program: comp.lang.c++ - 25 new messages in 13 topics

comp.lang.c++
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==============================================================================
TOPIC: U++ 1096
http://groups.google.com/group/comp.lang.c++/t/31d71e8485eda075?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Apr 25 2009 3:51 pm
From: Mirek Fidler

Website: http://www.ultimatepp.org
Download: http://code.google.com/p/upp-mirror/downloads/list

U++ is BSD licensed C++ cross-platform rapid application development
suite focused on
programmers productivity without sacrificing runtime performance.

Based on strictly deterministic design it provides an alternative to
GC collected platforms,
even for bussines logic oriented problems.

Library
Painter: High quality, "SVG/PDF strength" software renderer
HttpClient improvements
JPGRaster now can read EXIF thumbnails
ODBC SQL interface
Microsoft SQL Server interface improved
Multithreading: ConditionVarable and LazyUpdate classes
LocalProcess class
RichText: EncodeHTML support for superscript, subscript, strikeout
and smallcaps
Mersenne twister based Random

TheIDE:
Win32 .pdb debugger:
shows tooltip with values of variables
improved displaying of strings in pdb debugger
watches are remembered, Clear all watches function, Drag&Drop to
watches
Packages can be sorted by name
Packages now can be colored and assigned bold/italic font
Package files underlined if recently changed
SVN support, SVN history of file
Compare with file, compare with patch
Assist++
New heurestic error recovery of C++ parser
New code navigator bar
Position of Assist parameter info improved
Context go to (Alt+J) now jumps to layout designer when invoked on
layout class template
Topic++ finished; documentation now visible (and editable) as tooltip
annotations of sources
Abbreviations: e.g. type "i" and press Ctrl+[.] to expand it to if
() ;
Icon editor: free angle rotation
"Insert" color or U++ specific includes (.lay, .iml, .tpp group)
Print command (of source files)
Editor: ToUpper/Lower/InitCaps/SwapCase

==============================================================================
TOPIC: Public read-only member
http://groups.google.com/group/comp.lang.c++/t/f0332667521dca45?hl=en
==============================================================================

== 1 of 1 ==
Date: Sun, Apr 26 2009 12:55 am
From: "LiShuJun"

_bitrate = ???
"Jonathan Lee" <chorus@shaw.ca>
??????:86052278-4a48-443e-ace4-8bcfd91b7ed2@v15g2000yqn.googlegroups.com...
> So I've seen on some web sites a solution for the problem of having a
> class member that is public and read-only. Probably you've all seen
> this, but basically it makes a reference to a private member, and adds
> a const:
>
> class SoundEffect {
> public:
> SoundEffect() : bitrate(_bitrate) { };
> long const & bitrate;
> private:
> long _bitrate; // Info the user might want, but class doesn't
> use.
> }
>
> Personally, I don't mind this approach over a getBitrate() member
> _supposing_ that the value of "_bitrate" is not essential to the
> operation of SoundEffect. i.e., if someone worked around the const and
> changed "_bitrate", it wouldn't be that important.
>
> I'm wondering if there are other caveats to this method. To me it
> seems friendlier for the user of the class, but maybe I'm overlooking
> something.

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==============================================================================
TOPIC: Strange syntax error
http://groups.google.com/group/comp.lang.c++/t/9b9b07ba1592bfb2?hl=en
==============================================================================

== 1 of 1 ==
Date: Sun, Apr 26 2009 3:06 am
From: James Kanze

On Apr 25, 10:59 am, "Qu0ll" <Qu0llSixF...@gmail.com> wrote:
> I am trying to compile the open source OGLFT library with
> MinGW on Windows Vista but encounter this strange error:

> OGLFT.cpp: In member function `void OGLFT::Filled::init()':
> OGLFT.cpp:2538: error: invalid conversion from `void (*)()' to `void (*)()'
> OGLFT.cpp:2538: error: initializing argument 3 of `void
> gluTessCallback(GLUtesselator*, GLenum, void (*)())'

> How could "void (*)()" not be the same as "void (*)()"?

It's a very bad error message. Given the little bit of code you
show, it's clearly omitting both the parameter types and the
fact that the function is a member (supposing that Filled is a
class, and not a namespace).

> The actual line of source looks like this:
>
> gluTessCallback( tess_obj_, GLU_TESS_VERTEX,
> (GLUTessCallback)vertexCallback );

> where vertexCallback is defined as:

> void Filled::vertexCallback ( VertexInfo* vertex )
> {
> if ( vertex->color_tess_ != 0 )
> glColor4fv( vertex->color_tess_->color( vertex->v_ ) );
> if ( vertex->texture_tess_ != 0 )
> glTexCoord2fv( vertex->texture_tess_->texCoord( vertex->v_ ) );
> glVertex3dv( vertex->v_ );
> }

It would help if we could also see the declaration of
gluTessCallback, to see what it is expecting. And what
GLUTessCallback is. However, if Filled is a class, then the
expression (GLUTessCallback)vertexCallback shouldn't compile,
regardless---the only thing you can do with a member function is
call it (using an instance of the class, so you need a . or a ->
operator to the left, and a () operator to the right), or take
its address, in which case, you must use a qualified id and the
address of operator, e.g.:
&Filled::vertexCallback.
No other uses are legal.

> I am new to C++ so I am not sure how much more of the code I
> need to show you. I guess I just can't understand what the
> error message is actually trying to say.

It is more than vague. But to answer fully your question, we
need to know 1) whether Filled is a class or a namespace, 2) how
GLUTessCallback is defined, and 3) the signature (declaration)
of gluTessCallback.

--
James Kanze (GABI Software) email:james.kanze@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientierter Datenverarbeitung
9 place Sémard, 78210 St.-Cyr-l'École, France, +33 (0)1 30 23 00 34

==============================================================================
TOPIC: parallel computing in C++
http://groups.google.com/group/comp.lang.c++/t/d9c643de979b9a57?hl=en
==============================================================================

== 1 of 3 ==
Date: Sun, Apr 26 2009 3:30 am
From: Juha Nieminen

Ian Collins wrote:
> Look for openMP.

This is a good tutorial for those fluent in C++:

http://bisqwit.iki.fi/story/howto/openmp/

== 2 of 3 ==
Date: Sun, Apr 26 2009 4:16 am
From: Rui Maciel

carlosp wrote:

> I am programing something that could greatly benefit from parallel
> computing in C++, in parts of the program, where user defined classes
> are passed. I have googled but I cannot find the proper tool. Any
> experienced programmer could give me a hint, namely some good
> keywords?

What's wrong with pthreads?

Rui Maciel

== 3 of 3 ==
Date: Sun, Apr 26 2009 2:05 pm
From: namekuseijin

Juha Nieminen wrote:
> Ian Collins wrote:
>> Look for openMP.
>
> This is a good tutorial for those fluent in C++:
>
> http://bisqwit.iki.fi/story/howto/openmp/

Hey, Warp! Nice to see you here... ;)

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== 1 of 1 ==
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