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Python again
by Stefan Slapeta 26 Sep '04

26 Sep '04

Anybody an idea what is the reason for the "new" white cells (Intel-win32, cw, vc*)? I can find nothing about these tests in bjam.log but a single line in the list at the beginning boost-test(COMPILE) "python/select_arg_to_python_test" : "libs\python\test\select_arg_to_python_test.cpp" ...so it very much looks like they are not compiled at all! Stefan

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Please, comment design decision of simple FSM
by Alexander Nasonov 25 Sep '04

25 Sep '04

After playing with my overloads library and trying to apply it to FSM I realized that some metaprogramming can be replaced with natural overload resolution rules. After realizing it, I come to conclusion that simple FSM can be implemented as a set of call operators and a list of states. Each call operator represents a transition and follows this pattern: NewState operator()(State,Event) const; Transition functions are generated in process_event function on first call (in a constructor of static variable, for example). Each function extracts current state from StatesAsVariant (boost::variant of all states): template<class StatesAsVariant, class State, class Event> void transition(FSM& fsm, StatesAsVariant states, Event event) { states = fsm( get<State>(states), event); // select best transition // according to overload // resolution rules } The only metaprogramming algorithm is for_each<States> to initialize transition table for the event. Comments? -- Alexander Nasonov

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Re: CW 9.3 results (or lack thereof) - uBLAS fails
by Michael Stevens 25 Sep '04

25 Sep '04

Stefan Slapeta wrote: > I've noticed that once again all ublas test cases threw a gpf in the > last run or CW 9.3. I think I used the latest sources, but at the moment > I've switched back to non-incremental builds and thus we can be sure > tomorrow. I suspect we have some real problem. The failure conditions are interesting. In all cased the first test set which is instantiated with double is successful. Then when instantiated with std::complex<double> the same test fails. Generally this failure is in a swap operation. test4 is however interesting. The first test only constructs two vectors and then destructs them on function return. It also fails with std::complex<double>. So I am suspecting some memory management problem related to complex<double>. If anyone has the time I would to see a call trace at the point of failure. Thanks, Michael

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Re: [boost] [multi_index + mpl + bind] Regression?
by JOAQUIN LOPEZ MU?Z 25 Sep '04

25 Sep '04

Vladimir, I don't have my compiler handy right now, but I think this is due to an overlook when doing the adaptation to the new MPL. In particular, the line 50 in boost/multi_index/detail/node_type.hpp: typedef typename IndexSpecifierIterator::type index_specifier; should be changed to typedef typename mpl::deref<IndexSpecifierIterator>::type index_specifier; (also, the corresponginf #include <boost/mp/defer.hpp> must be inserted) Could you please try this locally and report the results? If the problem is solved, I'll commit something along this line next Monday. I don't know the rationale for having to use deref, since I thought these two expressions are equivalent, but there must be some difference, for Alexsey changed some of the code in multi_index to do that when mergien the new MPL. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo ----- Mensaje original ----- De: Vladimir Prus <ghost(a)cs.msu.su> Fecha: Sábado, Septiembre 25, 2004 2:41 pm Asunto: [boost] [multi_index + mpl + bind] Regression? > > The attached code, which use the multi_index library, produces > screens of > errors from mpl. The STLfilted log is attached too. > > Commenting out #include <boost/bind/arg.hpp> makes the error go > away, as well > as including it after multi_index. > > This happens with: > gcc version 3.3.4 (Debian 1:3.3.4-6sarge1) > gcc version 3.4.1 (Debian 3.4.1-4sarge1) > > The code used to work some time ago, but I can't give the exact date. > > I've tried too look at the problem, but got lost in MPL internals. > > - Volodya > _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost

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[multi_index + mpl + bind] Regression?
by Vladimir Prus 25 Sep '04

25 Sep '04

The attached code, which use the multi_index library, produces screens of errors from mpl. The STLfilted log is attached too. Commenting out #include <boost/bind/arg.hpp> makes the error go away, as well as including it after multi_index. This happens with: gcc version 3.3.4 (Debian 1:3.3.4-6sarge1) gcc version 3.4.1 (Debian 3.4.1-4sarge1) The code used to work some time ago, but I can't give the exact date. I've tried too look at the problem, but got lost in MPL internals. - Volodya

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[serialization] scoped_ptr.hpp broken
by Vladimir Prus 25 Sep '04

25 Sep '04

Hello, I'm getting this error: ......./boost/boost/serialization/scoped_ptr.hpp:36: error: `make_nvp' undeclared (first use this function) The attached patch fixes the problem. BTW, Robert, this problem was introduce when you moved the content of the header from boost::serialization to just boost::. What was the rationale? The log only says: fixes for cw/comeau implement ADL - Volodya

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RE: [boost] Re: GUI Windowing Framework in C++
by Brian Braatz 25 Sep '04

25 Sep '04

> -----Original Message----- > From: boost-bounces(a)lists.boost.org [mailto:boost-bounces@lists.boost.org] > On Behalf Of Thomas Witt > Sent: Friday, September 24, 2004 7:21 AM > To: boost(a)lists.boost.org > Subject: [boost] Re: GUI Windowing Framework in C++ > > David Abrahams wrote: > > Reece Dunn <msclrhd(a)hotmail.com> writes: > > > >>[1] Support constructor-based window creation, e.g.: > >> > >> frame.add( new gui::button( "Boost!" )); > > > > > > Get rid of the new operator, though. IMO there's no excuse for a GUI > > framework to expose users to unmanaged resources. > > Hmm, do you know of a C++ GUI framework that gets this right? > > Just curious [Brian Braatz] The problem is handling the "dual lifetimes" of "system" GUI objects and C++ objects. BeOS is the only system I know that does not have this issue, because they extended C++ in such a way so that when you "create" a C++ window object- you now have a window. In frameworks like MFC, they have to internally track a windows resources "object" that the system understands as the gui object. You will always need a dynamic nature to things, but one could take a Rogue Wave approach here and hide all those new's behind accessor type objects which pass around by value and internally hold something like a boost::shared_ptr<> (my 2 cents) Brian

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RE: [boost] C++ GUI - another view
by Reece Dunn 25 Sep '04

25 Sep '04

Andy Little wrote: >Recent discussions on boost have talked about GUI's in quite technical >terms, windowing etc. Another part of the abstraction is simply that of >providing an area for drawing on. The code below is a simple example of >what >I mean. The "drawFunction" is meant to be like a graphics version of a >main() function .( Note that there should ideally be no DeviceHandle >visible >to the "drawFunction". The DeviceHandle should be wrapped in the GX object, >passed to the function so some of the impl is poking through here in form >of >the gx.line_to etc functions 'hdc' argument. Its early days.) Your code looks good, but here are a few comments: [1] The general impression from users of a GUI library is that they are against using a template-based library. [2] The DeviceHandle should be hidden via an interface and have an implementation for *nix, mac, Windows and others. [3] I strongly recommend that the graphical side (devices, pens, brushes, images, fonts, etc.) be separate from the GUI (windows/widgets, events, etc.). The GUI framework will make use of the graphics framework for drawing to a window's client area. [4] I like how you specify independant coordinates. Is this customizable (i.e. can you change between pixels, cm, inches, etc.) and can you convert between coordinate systems (e.g. when implementing a web browser, CSS units can be percentages, cm, pc, pt, etc.)? [5] Can you get the width and height of the drawing rectangle? Is it possible to create a scrolling view of a larger drawing area? Regards, Reece _________________________________________________________________ Stay in touch with absent friends - get MSN Messenger http://www.msn.co.uk/messenger

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Addition for shared_ptr
by Michael Rutman 25 Sep '04

25 Sep '04

I'd like to propose adding a template function to shared_ptr to allow the automatic testing of a shared_ptr to its raw ptr. The template is as simple as template <class T> bool operator==(boost::shared_ptr<T> const & a, T * const & b) { return a.get() == b; } Here is the case where I need it. I have a vector<Foo> myFoo. In a method of Foo I need to see if this instance is in the vector. I want to do this vector<Foo>::iterator iter = find( myFoo.begin(), myFoo.end(), this );

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[Pointer Containers] [Indexed Set]
by Bruno Martínez Aguerre 24 Sep '04

24 Sep '04

Hi. I was wondering if these two libs work together. That is, can Indexed Sets take ownership of my pointers? Also, I couldn't find the docs for neither of the two libs. I looked here http://www.boost.org/regression-logs/cs-win32_metacomm/doc/html/libraries.h… for Indexed Set, and here http://boost-consulting.com/boost/more/formal_review_schedule.html for Pointer Containers. I think these two are the best places for it. Bruno Martinez

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