- Boost-users - lists.boost.org

[fusion] error in map docs
by Ovanes Markarian 19 Apr '07

19 Apr '07

Hello! Thanks for the great lib again. I was using a fusion::map container and discovered the following error at: http://spirit.sourceforge.net/dl_more/fusion_v2/libs/fusion/doc/html/fusion… The exsample states: typedef map< pair<int, char> , pair<double, std::string> > map_type; map_type m( make_pair<int>('X') , make_pair<double>("Men")); std::cout << at<int>(m) << std::endl; std::cout << at<double>(m) << std::endl; ^^-- error Where it should be not at<TYPE>(...) but at_key<TYPE>(...). With Kind Regards, Ovanes

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Bill Lear: "Re: store vector<> to filesystem (newbie question)"
by Gennady Khokhorin 19 Apr '07

19 Apr '07

Bill, it is the same message with different subject. I'm not sure if previous will show up on this thread as a respond to your sending. -----Original Message----- From: Gennady Khokhorin Sent: Wednesday, April 18, 2007 2:45 PM To: 'boost-users(a)lists.boost.org' Subject: Re: store vector<> to filesystem (newbie question) >template<typename Archive> >struct Serializer { > static void save(const vector<double>& timeStamps) { > std::ofstream ofs("file.bin", std::ios::binary); > > Archive oa(ofs); > oa << timeStamps; > } >}; > >Serializer<binary_oarchive>::save(timeStamps); Thanks, Bill, for your fast respond! Started reading serialization. Did try to use serialization from your sample, got stuck with error message: Error 20 error C2039: 'serialize' : is not a member of 'std::vector<_Ty>' c:\boost\include\boost-1_33_1\boost\serialization\access.hpp 109 Is it restriction sign for using std::vector<> with << operator or I'm missing some headers? my settings: #include <boost\archive\binary_oarchive.hpp> using namespace boost::archive; gok

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Re: [Boost-users] Boost and Intellisense...
by james.jones＠firstinvestors.com 19 Apr '07

19 Apr '07

From: "Ferng, Andrew D" <andrew.d.ferng(a)boeing.com> > I've also seen this occur with BGL. Before I make a call to > connected_components, it's fine. Afterwards, intellisense no longer > works. > Maybe VS has an issue with reading hpp? Just my wild guess... My guess is that IntelliSense just doesn't work with templates - whenever I've introduced templates into my code (BOOST or not), IntelliSense becomes UnintelliSense. I also think this isn't too surprising. Considering the potential complexity of templated code, expecting IntelliSense to handle it well is probably not reasonable - IntelliSense would have to *execute* the entire template metaprogramming subset of C++ "on the fly" to handle template types completely. - James Jones Administrative Data Mgmt. Webmaster 375 Raritan Center Pkwy, Suite A Data Architect Edison, NJ 08837

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BoostCon conference calls?
by Dave Jenkins 19 Apr '07

19 Apr '07

Does anyone know if the Aspen Center for Physics makes any conference calling facilities available to BoostCon? Because I was wondering, if special interest groups want to get together informally and have people call in and participate from wherever they are, could we do it? I know Joel de Guzman is talking about getting the Spirit group together informally for "feedback, comments and in general, discussion about what's to come" and it would be great if people not at the conference could participate. I don't know how well this would work and I don't know if Joel would like it (pizza and beer were mentioned, which don't transmit well over the phone lines), but it seems like BoostCon is a great opportunity for groups to get together and brainstorm about the future. See you at BoostCon! Dave Jenkins

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Re: [Boost-users] Bill Lear store vector<> to filesystem (newbie
by Gennady Khokhorin 19 Apr '07

19 Apr '07

Thanks, Bill! Its working! I was missing <boost/serialization/vector.hpp> header. Happy programming! gok

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Re: [Boost-users] store vector<> to filesystem (newbie question)
by Gennady Khokhorin 18 Apr '07

18 Apr '07

>template<typename Archive> >struct Serializer { > static void save(const vector<double>& timeStamps) { > std::ofstream ofs("file.bin", std::ios::binary); > > Archive oa(ofs); > oa << timeStamps; > } >}; > >Serializer<binary_oarchive>::save(timeStamps); Thanks, Bill, for your fast respond! Started reading serialization. Did try to use serialization from your sample, got stuck with error message: Error 20 error C2039: 'serialize' : is not a member of 'std::vector<_Ty>' c:\boost\include\boost-1_33_1\boost\serialization\access.hpp 109 Is it restriction sign for using std::vector<> with << operator or I'm missing some headers? my settings: #include <boost\archive\binary_oarchive.hpp> using namespace boost::archive; gok

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filesystem path initialization question...
by Graham Reitz 18 Apr '07

18 Apr '07

Why does the following path initialization throw this? "boost::filesystem::path: invalid name "c:" in path: "c:/dev/Sandbox/file_system/ textfile1.txt" How do you set paths that should work on windows and linux without avoiding this issue? Since linux doesn't have drive like C: D: and etc? try { // Is this not an appropriate method to initialize path objects? path text_file(current_path().string() + "/textfile1.txt"); if (exists(text_file)) { cout << file_size(text_file) << endl; } } catch (const filesystem_error& e) { cout << e.what() << endl; } I am running this under windows. Thanks, Graham

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[Pool][singleton_pool] Performance problem or bad usage?
by Aubrey, Jason 18 Apr '07

18 Apr '07

Hi, I've created a helper class called MemoryPooled to help add pooling to some of my classes; however, the performance seems slow by comparison to non-pooled behavior. My code is shown below, I suspect I'm doing something wrong but I don't see how it can be my class. Does anyone have any idea? -Jason // Begin code -------------------------------------- #include <Utilities/stopwatch.h> #include <boost/pool/singleton_pool.hpp> #include <boost/shared_ptr.hpp> #include <iostream> template<typename T> class MemoryPooled : public T { public: MemoryPooled(){} virtual ~MemoryPooled(){} static const int countObjectsInitiallyAllocated = 1000; typedef boost::singleton_pool<T, countObjectsInitiallyAllocated> Pool; void* operator new(size_t /*p_memSize*/) { return Pool::malloc(); } void operator delete(void* p_memBlock) { Pool::free(p_memBlock); } }; struct Test1 { int i0; int i1; int i2; int i3; int i4; int i5; int i6; int i7; int i8; int i9; }; void test(bool p_isPooled) { Utilities::StopWatch sw; // Stopwatch is my helper for getting times sw.start(); for(int i=0; i < 100000; ++i) { if( p_isPooled ) boost::shared_ptr<Test1> item(new MemoryPooled<Test1>()); else boost::shared_ptr<Test1> item(new Test1()); } const double elapsed = sw.elapsedTime(); cout << "Elapsed time: " << elapsed << " ms" << endl; } int main(int, char**) { test(true); test(false); } // End code -------------------------------------- Output: Elapsed time: 106.812 ms (Pooled) Elapsed time: 94.2158 ms (Not Pooled)

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karta orkanen
by Johan Råde 18 Apr '07

18 Apr '07

Här är en länk till en karta som visar vart vi ska. Orkanen är byggnad nr 1 på kartan. --Johan http://www.mah.se/upload/6744/malmokarta_sv.pdf

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store vector<> to filesystem (newbie question)
by Gennady Khokhorin 18 Apr '07

18 Apr '07

I have vector<double> timeStamps; How to store this vector to outside binary file in boost style? I'm trying to utilyze mapped file: std::vector<double> timeStamps; std::string filePath("c:\\double_test.bin"); boost::intmax_t thisFileSize(maxSize); // max good value: 0x2FFFFFFF ios::filtering_ostream out; ios::file_sink fsink(filePath); out.push(fsink); //out.write(time_stamps.begin(), thisFileSize); // out.flush(); fsink.close();

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