May 2010 - Boost-users - lists.preview.boost.org

boost::thread condition variables
by Eric J. Holtman 09 May '10

09 May '10

(using windows XP, VS2008) Is there a limit to the number that can be constructed/destructed in a single process over time? I have a loop which was doing while (1) { condition_variable cv; mutex mx; // do some things with cv and mx } that while loop would run maybe 200 or 300 times. Occasionally, I'd get a crash in notify_all (), where it seemed like a handle wasn't valid. When I move the declaration of the variables outside the while loop, this doesn't happen. Now, it's entirely possible that I have some other bizarre race condition. In fact, if my previous years of experience have taught me anything, I will discover that error in the very next session after I hit "send" on this email. However..... is there some limit to constructing/destructing and using up Windows handles that I should know about?

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[1.43.0] PDF build of docs now available.
by John Maddock 09 May '10

09 May '10

The PDF build of the documentation for 1.43 (for those libraries that support this) is now available from the sourceforge download page: http://sourceforge.net/projects/boost/files/ The direct links are: http://sourceforge.net/projects/boost/files/boost-docs/1.43.0/boost_pdf_1_4… http://sourceforge.net/projects/boost/files/boost-docs/1.43.0/boost_pdf_1_4… http://sourceforge.net/projects/boost/files/boost-docs/1.43.0/boost_pdf_1.4… http://sourceforge.net/projects/boost/files/boost-docs/1.43.0/boost_pdf_1.4… Enjoy! John.

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[test] To Advertise the availble tests in XML format: -xml
by Jeff Flinn 09 May '10

09 May '10

When I [mis]type my desired test, test prints to the console: Usage: Run All tests: No Args Run Specific Test or Suite: <suite name> [<test name>] Available tests: To Advertise the availble tests in XML format: -xml So what is the argument to Advertise all available tests? Thanks, Jeff

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Serialization and std::move
by Brian Wood 09 May '10

09 May '10

B"H I'm doing some research. I grep'ed through the 1.43 version of the libs/serialization directories for uses of std::move and didn't find any. I also looked at the "To Do" section of the documentation and didn't find any mention of move semantics. Does Boost Serialization take advantage of std::move to improve the performance of it's load operations? Something like the following: template <typename B> void Receive(B* buf, vector<deque<string> >& abt1) { uint32_t headCount[2]; buf->Give(headCount[0]); abt1.reserve(abt1.size() + headCount[0]); while (headCount[0] > 0) { --headCount[0]; deque<lil_string> rep4; buf->Give(headCount[1]); while (headCount[1] > 0) { --headCount[1]; string rep5; stringReceive(buf. rep5); rep4.push_back(std::move(rep5)); } abt1.push_back(std::move(rep4)); } } Thanks in advance. -- Brian Wood

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Problem with Property Tree and xml_read
by Rouven Walter 08 May '10

08 May '10

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[Random] Passing an arbitrary uniform random number generator to a function
by Joseph Wakeling 08 May '10

08 May '10

Hello, Suppose that I have a function that takes a uniform random number generator as an argument, e.g. double foo(mt19937 &urng) { double x = uniform_real<double> (0.0, 10.0) (urng); double y = uniform_real<double> (5.0, 7.0) (urng); return (x*y); } Is there a way to make the choice of random number generator arbitrary (i.e. not limited to mt19937) without making the function a template? Alternatively, is there a better way of passing around the basic uniform random number generator? The reason for the no-template rule is that I would like to pass a URNG to a virtual function in a class, and I would really not like to have to make the class itself a template dependent on the type of URNG. Can someone recommend a solution? Thanks and best wishes, -- Joe

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[boost][filesystem] Rename throws exception if target file exists
by Sanjit Jhala 08 May '10

08 May '10

I need to achieve an atomic move to replace an existing file. Is there anyway to do this using boost::filesystem? I thought rename would do this but it throws the following exception: " boost::filesystem::rename: File exists:" when the target file exists. -Sanjit

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Trouble with templating of adjacency_list
by Eric Fowler 08 May '10

08 May '10

Perhaps this should go to a g++ group but I have a feeling the answer is Out There: Why is g++ having trouble with this? Error is ../main.cpp:19: error: template declaration of ‘boost::adjacency_list<boost::vecS, boost::vecS, boost::bidirectionalS, POS<T>, boost::no_property, boost::no_property, boost::listS> DG’ template<typename T = int> struct POS { T x, y; }; template<typename T> adjacency_list<vecS, vecS, bidirectionalS, POS<T> > DG;

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BGL: Problem to compile components_on_edgelist.cpp example.
by arm2arm 08 May '10

08 May '10

Hello, I cannot compile the components_on_edgelist.cpp example with gcc 4.5/4.2 and VC++2009. I am using Boost 1.42 It trows errors on >c:\boost\include\boost-1_42\boost\graph\incremental_components.hpp(178) : error C2825: 'ParentIterator': must be a class or namespace when followed by '::' 1> c:\boost\include\boost-1_42\boost\graph\incremental_components.hpp(141) : see reference to function template instantiation 'void boost::component_index<IndexType>::build_index_lists<ParentIterator,boost::typed_identity_property_map<T>>(ParentIterator,const ElementIndexMap &)' being compiled 1> with 1> [ 1> IndexType=int, 1> ParentIterator=const unsigned int *, 1> T=size_t, 1> ElementIndexMap=boost::typed_identity_property_map<size_t> 1> ] and more... Are there some work around ? Actually I would like to construct disjoint sets based on vector<Edge>, where Edge is pair<uint, uint>. Thanks Arman. -- View this message in context: http://old.nabble.com/BGL%3A-Problem-to-compile-components_on_edgelist.cpp-… Sent from the Boost - Users mailing list archive at Nabble.com.

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[Boost MPI]Problems with instalation the boost in visual 2008
by Juliet Villanueva 08 May '10

08 May '10

Hello: I'm trying to install the boost libraries MPI, but so far I have not been successful. So far the steps I performed are: 1) Run the file in the folder bjam.exe of boost, this procedure creates libs, some of the folders boost, but skips the folder of MPI, which does not generate the appropriate libs. 2) When the library is installed tells me that you must modify the user-config.jam, adding "usign MP" I, for installation. 3) After editing the file is placed bjam command-with-mpi install, and start the installation indicating that boost jump MPI library. Another way I try it from the compiler to use Visual stdio 2008, from the terminal set, follow these steps: 1) Set within the boost folder 2) Run the file bajm.exe, here starts the installation again skipping the boost folder MPI. 3) When the library is installed tells me that you must modify the user-config.jam, adding "usign MP" I, for installation. 4) After editing the file put the following command: C: \ boost_1_42_0 \ boost_1_42_0> bjam - build-type = complete - toolset = MSVC - build-dir = C: \ src \ boost_1_42_0 \ build \ 90 \ 32 - stagedir = C: \ src \ boost_1_36_0 \ stage \ 90-32 stage. This line starts installing again but skip the folder you need. The truth is no longer what happens, because so far I can already detect the libraries, all I need are generating. Lib, which tells me that the compiler can not locate the libs are missing me the following: • libboost_mpi-vc90-mt.lib • libboost_mpi-vc90-mt-1_36.lib • boost_mpi-vc90-mt.lib • boost_mpi-vc90-mt-1_36.dll • boost_mpi-vc90-mt-1_36.lib Someone can help me fix this, scheduled to begin in MPI boost, I would greatly appreciate. Julieth

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