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compilation flag effect on boost::condition::timed_wait()
by Vishal Bayskar 04 Feb '11

04 Feb '11

Dear All, I am getting different behaviour of condition::timed_wait() function when I compile my code with NDEBUG flag and without NDEBUG flag. with using NDEBUG flag, timed_wait() wait for condition (mutext) as desired but whey I don't use NDEBUG flag while compiling my code it does wait for condition (mutex) but return at the same time when it is called. In both the cases return value is 1. Please note that it is not a race condition but it is happening every time. Also note that I am using other flags too for compiling my code like -Werror -pthread -fno-strict-aliasing -Wno-unused-variable -Wno-unused-parameter -Wno-unused-function -O3 -ggdb3 -m64 Please let me know what can be possible impact of NDEBUG flag on timed_wait() function. Thanking you Vishal DISCLAIMER: ----------------------------------------------------------------------------------------------------------------------- The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. It shall not attach any liability on the originator or NECHCL or its affiliates. Any views or opinions presented in this email are solely those of the author and may not necessarily reflect the opinions of NECHCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification, distribution and / or publication of this message without the prior written consent of the author of this e-mail is strictly prohibited. If you have received this email in error please delete it and notify the sender immediately. . -----------------------------------------------------------------------------------------------------------------------

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[Interprocess] shared_ptr in a non-throwing mode
by Pietro Versari 04 Feb '11

04 Feb '11

Hi Ion (and everyone else), I'm a newbye and I have only one simple (stupid?) question: how can I construct a shared_ptr in a non-throwing mode? This example throw if there is enough space for MyType but isn't enough for my_shared_ptr: typedef managed_shared_ptr<MyType,managed_shared_memory>::type my_shared_ptr; my_shared_ptr sh_ptr = make_managed_shared_ptr( segment.construct<MyType>("object to share", std::nothrow)(), segment); Thanks Pietro Versari

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Re: [Boost-users] Boost-wide concept docs
by Mathias Gaunard 03 Feb '11

03 Feb '11

On 03/02/2011 17:52, Edward Diener wrote: > I have seen concepts mentioned in documentation > for many Boost libraries but I never knew how to document a concept for > what I myself may be working on. Does Boost specify a preferred common > format for documenting a concept anywhere ? Yes, caramel (that's an XML format). It integrates with boostbook and quickbook. See libs/concept_check/doc/reference for examples.

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[statechart]BitMachine with custom reactions. How to?
by vs＠spinke.de 03 Feb '11

03 Feb '11

Hello! I tried to add custom reactions to the statechart library example BitMachine. It shall not only change the state, but also perform some (self-defined) action on the transition. Could somebody tell me, where I have to add / change what in order to achieve the goal? Any hints are welcome. Thanks a lot. Volker

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[Boost Graph Library] larger neighborhood in grid_graph
by Hannes Schulz 03 Feb '11

03 Feb '11

Hi all, i recently discovered grid_graph and found it quite useful so far. However, I would prefer a larger neighborhood in the graph (e.g. 8 instead of 4 for 2D; 26 instead of 6 in 3D). I already started looking into copying and modifying grid_graph.hpp accordingly, but cannot entirely anticipate the complexity of the problem. Therefore I decided to ask here first: - Why did the developers restrict grid_graph to "orthogonal" neighborhoods? - Is a modification of grid_graph worth it, or am I going to throw away everything anyway and should start over anew instead? (without the wrapping overhead, which I do not need) Thank you very much! Hannes

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[Regex] Boost.Regex - can't compile/link...
by Robert Pennington 02 Feb '11

02 Feb '11

Hey there, I am trying to compile a very simple example program that I copied from the boost getting started guide for windows (after successfully running a bjam complete build). BTW: I am using the gcc compiler within the Code::Blocks IDE on Windows XP. Here is the code, just in case: ========================================================== #include <boost/regex.hpp> #include <iostream> #include <string> int main() { std::string line; boost::regex pat( "^Subject: (Re: |Aw: )*(.*)" ); while (std::cin) { std::getline(std::cin, line); boost::smatch matches; if (boost::regex_match(line, matches, pat)) std::cout << matches[2] << std::endl; } } ========================================================== Every time I try to compile this code (by hitting the 'Build and Run' button in Code::Blocks), I get a whole bunch of error messages. The first one I get is: "C:\Program Files\boost\boost_1_45_0\boost\regex\v4\cpp_regex_traits.hpp|366|undefined reference to `boost::re_detail::cpp_regex_traits_char_layer<char>::init()'|". Any ideas? Thanks in advance, Rob Pennington

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Fusion: Structs containing an array
by Gunther Laure 02 Feb '11

02 Feb '11

Hi! I am trying to use boost fusion to build [de]serializer for simple types (int ...) and structs. I had success until I tried structures holding arrays. Example: struct EntryTable { unsigned int count; unsigned int data[4]; }; BOOST_FUSION_ADAPT_STRUCT( EntryTable, (unsigned int, count) (unsigned int, data[4]) ) I would wish to get a fusion::vector<unsigned int, unsigned int[4]>, but the assignment of the struct only compiles if the fusion vector is defined as fusion::vector<unsigned int, unsigned int>. EntryTable t; fusion::vector<unsigned int, unsigned int> f1 = t; // works fusion::vector<unsigned int, unsigned int[4]> f2 = t; // doesnt work (not even compile) What am I doing wrong? Is there a simple way to simple wrap an array using fusion? Bye Gunther using boost 1.42 g++ 4.4.5

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Re: [Boost-users] Compiling Boost (Steven Watanabe, Bhushan Inamdar)
by Bhushan Inamdar 02 Feb '11

02 Feb '11

Hi Steven, Thanks for the prompt reply. My problem is solved. It seems that, every time, I have to go to project properties and in the C++ tab and include the absolute path to the Boost directory. After doing this, the program compiles with out any complaints. So further up, my question is...Is it necessary to do this everytime? Or my Boost installation is missing something? Let me know.... Thanks, Bhushan

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What's happened to Ryppl?
by Robert Jones 02 Feb '11

02 Feb '11

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Need help identifying present and past Boost authors
by John Wiegley 01 Feb '11

01 Feb '11

Hello, I'm working on a repository convertor which must translate SVN author ids to fullname/e-mail pairs. This has already been done to some extent by Brad King, but I've found that several authors remain unidentified. I'm sending this e-mail to ask the Boost community if they could identify any or all of the authors at the following URL whose name is Unknown. Also, if you can provide spelling corrections or more updated e-mail information, please let me know by e-mail. The current authors file is here: https://github.com/jwiegley/subconvert/blob/master/doc/authors.txt I'll update the file as corrections are provided. Thank you, John Wiegley BoostPro Computing http://www.boostpro.com

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