December 2006 - Boost - lists.preview.boost.org

boost.graph python bindings build against RC-1-34
by John Reid 09 Jan '07

09 Jan '07

Hi, Has anyone had any joy building these against the latest RC_1_34_0? I think the support for boost.build v1 has been removed from the latest CVS version. The bgl-python library still uses v1 Jamfiles though. Even if I update these to v2 jamfiles I still get compilation errors: bgl-python\boost/graph/python/resizable_property_map.hpp(56) : error C2039: 'get_store' : is not a member of 'boost::vector_property_map<T,IndexMap>' Any advice on the easiest way to proceed? Maybe I should download 1_33_1 and compile against that. Does anyone have any pre-built binaries for python 2.5? Thanks, John.

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[tr1/result_of] SFINAE propagation by design?
by Tobias Schwinger 08 Jan '07

08 Jan '07

Hi Doug and Boost community, I noticed that the Boost implementation of result_of uses inheritance to forward the type member of a nested result metafunction, so that result_of<...>::type can result in a substitution failure (and not an error when used in an appropriate context) if the nested result class template does not have a type member. It's surely a nice feature (also because it usually stops trace diagnostics at a reasonable point in case of an error). Should the standard text perhaps encforce that kind of implementation - e.g: [tr.func.ret.ret] 2 5 (b) If N>0, result_of<F(T1, T2, ... TN)> inherits from F::result<F(T1, T2, ... TN)> ? Comments? Regards, Tobias

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[tr1/result of] and l/r values
by Tobias Schwinger 08 Jan '07

08 Jan '07

Hi, here's another result_of question: Given a function object struct f { template< typename T > r<T> operator()(T const &) const; template< typename T > r<T&> operator()(T &) const; template< typename Sig > struct result; }; , result_of< f(some_obj &) >::type // is r<T&> result_of< f(some_obj const & >::type // is r<T> but what about: result_of< f(some_obj) >::type // is r<T>? That's what I'd do intuitively. I also found an example (written by Dave) on the net that seems to do the same: http://tinyurl.com/yzeenu But wait: the TR1 text is talking about lvalues so I probably should let F::result return r<T&>?! Thanks a lot for clarification. Regards, Tobias

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Re: [boost] Boost Timer Update
by Stephan Kaiser 08 Jan '07

08 Jan '07

Hello Philippe, Do you also plan to tackle the problem with QueryPerformanceCounter() on multi-core systems? QPC reports problematic/mismatching values on certain multi-core CPUs (e.g. Athlon X2). Cheers, Stephan ----- Original Message ----- From: "Philippe Vaucher" <philippe.vaucher(a)gmail.com> Newsgroups: gmane.comp.lib.boost.devel Sent: Sunday, October 29, 2006 6:16 PM Subject: Boost Timer Update > Hello guys, > > I've been quite away from home in the last months so I wasn't able to work > on the timer, but now I'm back so I'd have some time now. > Today I've implemented Gennaro's device idea for QueryPerformanceCounter() / > timeGetTime(). > > As the vault's down, you can find it at > http://www.unitedsoft.ch/boost/timer_2006_10_29.zip. > > Are you guys still using QuickBook for the documentation ? Before going away > I started using it but it was quite painful. > > Philippe Vaucher > _______________________________________________ > Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost >

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[Serliazation] Thread-safety again
by Sean Huang 07 Jan '07

07 Jan '07

I posted this about a year ago but got no definite answer from Robert. http://thread.gmane.org/gmane.comp.lib.boost.devel/132838/focus=132838 I vaguely remember that there were similar discussions about this issue a few month back but do not know if it had reached any conclusion. Now my programs started crashing because of this problem and I am wondering if there is a good solution. Is making the function scope static objects static member with its caveats the best we could do? Thanks, Sean

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Final Getting Started Guide
by David Abrahams 07 Jan '07

07 Jan '07

I refactored the getting started guide into separate documents. Please see http://www.boost-consulting.com/boost/more/getting_started.html Library authors have not posted any working URLS of library-specific build instructions, so library names other than Boost.Python all link to the librarys' top-level pages. Enjoy -- Dave Abrahams Boost Consulting www.boost-consulting.com

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Proposal to add a Boost.FSM library
by Andrey Semashev 05 Jan '07

05 Jan '07

Hi, I would like to purpose a new library addition to Boost: Boost.FSM. FSM stands for Finite State Machine, so the library is aimed to ease creation and support of state machines in C++. State machine is a programming concept that allows to differentiate behavior of objects depending in their internal state. A simple example of such is a static variable in a function body. Before the first call to the function the memory that should hold the variable is in uninitialized state. During the first function call the variable constructs (in other words, it passes to an initialized state). And during any consequent calls the initialized variable is used (i.e. in the initialized state the function call does not lead to the variable construction). Of course, such simple logic may easily be implemented without any library support, using some boolean flags or state identifiers. But as the state machine complexity raises adding a new state to the machine gets more difficult and error-prone. This library is intended to hide basic state machine infrastructure and let the library user to focus on states and transitions between them. I've uploaded the library implementation, documentation and test to the Vault: http://boost-consulting.com/vault/index.php?action=downloadfile&filename=st… The implementation and documentation are quite stable, though there may be typos and mistakes in the documentation. The test still needs some cosmetic changes and a Jamfile, but it can be used as an example of the library usage. Please, post here your opinions on wether this library should have its place in Boost. Thank you. PS: Notes and suggestions about the implementation and documentation are also appreciated. -- Best regards, Andrey mailto:andysem@mail.ru

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boost::optional bug in 1.33.1
by Michael Walter 04 Jan '07

04 Jan '07

Hello, the following code fails using Boost 1.33.1, gcc version 3.4.2 (mingw-special): boost::optional<double> x; x=boost::optional<float>(boost::none); // converting assignment with the following error message: Assertion failed: this->is_initialized(), file ...boost/optional/optional.hpp, line 531 Replacing template<class U> optional& operator= ( optional<U> const& rhs ) { this->assign(rhs.get()); return *this ; } by e.g. template<class U> optional& operator= ( optional<U> const& rhs ) { if(rhs) this->assign(rhs.get()); else this->reset(); return *this ; } should fix the bug. Regards, Michael

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Submit to "Who's Using Boost?"
by Dai Hui 04 Jan '07

04 Jan '07

The name of the Application: Clipboard Recorder (http://www.lw-works.com/clipboard-recorder) The name of the company: LW-WORKS Software (http://www.lw-works.com) A paragraph describing the Application: Clipboard Recorder is an application that helps users to manage their clipboard history and provides easy ways for users to access their saved clipboard data. Libraries used: Smart Pointer, Serialization, Asio, String Algorithms, Bind, Thread, Conversion/Cast, Iostreams Regards, Dai Hui -- LW-WORKS Software - Creator of Clipboard Recorder Windows Clipboard utility

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Boost regression notification (2006-12-22 [RC_1_34_0])
by Douglas Gregor 04 Jan '07

04 Jan '07

Boost Regression test failures Report time: 2006-12-22T11:25:47Z This report lists all regression test failures on release platforms. Detailed report: http://engineering.meta-comm.com/boost-regression/CVS-RC_1_34_0/developer/i… 12 failures in 6 libraries concept_check (6) date_time (1) regex (1) statechart (1) test (2) utility (1) |concept_check| class_concept_fail_expected: borland-5.6.4 borland-5.8.2 borland-5.8.2 msvc-6.5 msvc-6.5 msvc-7.0 |date_time| testgenerators: qcc-3.3.5_gpp |regex| regex_regress_threaded: msvc-6.5 |statechart| TransitionTestNormal: intel-linux-9.0 |test| prg_exec_fail2: darwin-4.0.1 prg_exec_fail3: cw-9.4 |utility| operators_test: gcc-3.4.5_linux_x86_64

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