- Boost - lists.boost.org

[xpressive] Is there a way to test for an empty regex?
by Michael Goldshteyn 20 Nov '08

20 Nov '08

What is the best way to test for an empty boost::xpressive::regex object? That is, if I have code like: boost::xpressive::sregex re; ... // Test if re is empty and should not be used to perform a regex_search if (?????) Thanks, Michael Goldshteyn

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math statistical distribution: multivariate gaussian
by Thijs van den Berg 20 Nov '08

20 Nov '08

Hi, I'm about to start implementing a library for multivariate Gaussian distribution. The goal is to build a lib that provides a container for the definition of multivariate Gaussian, as well as implement various identities of that distributions. The identities are things like mean, variance but also conditional distributions, density gradients vector, linear combinations of multivariate Gaussian, Gaussian chain rule etc. I've seen request for something like this in the boost:math/statistical_distributions todo's list, and was wondering if it's possible to team up, or -if nobody is working on it- initiate development. Best, Thijs -- SITMO Quantitative Financial Consultancy - Software Development M.A. (Thijs) van den Berg Tel.+31 (0)6 2411 0061 Fax.+31 (0)15 285 1984 thijs(a)sitmo.com <mailto:thijs@sitmo.com> - www.sitmo.com <http://www.sitmo.com>

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[config] typo on doc
by vicente.botet 20 Nov '08

20 Nov '08

Hi, there are some typos in the table " Macros that describe C++0x features not supported " BOOST_NO_DEFAULTED_FUNCTIONS The compiler does not support defaulted (= default) functions. [[BOOST_NO_DELETED_FUNCTIONS The compiler does not support deleted (= delete) functions. BOOST_NO_UNICODE_LITERALS The compiler does not support Unicode (u8, u, U#) literals. ]] [[BOOST_NO_VARIADIC_TEMPLATES` The compiler does not support variadic templates. Can some macros be added to emulate the compiler behavior when BOOST_NO_DEFAULTED_FUNCTIONS BOOST_CONSTRUCTOR_DEFAULT BOOST_COPYCONSTRUCTOR_DEFAULT BOOST_NO_DELETED_FUNCTIONS BOOST_CONSTRUCTOR_DELETE BOOST_COPYCONSTRUCTOR_DELETE Best, Vicente

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[boostbock] failed to load external entity warning
by vicente.botet 20 Nov '08

20 Nov '08

Hi, while building the docs of one of the Boost libraries trunc I get the following error (I think that these errors do not depend on the release but on my configuration) warning: failed to load external entity "/home/Vicente/SVN/tools/boostbook/xsl/docbook.xsl" cannot parse /home/Vicente/SVN/tools/boostbook/xsl/docbook.xsl warning: failed to load external entity "/home/Vicente/SVN/tools/boostbook/xsl/doxygen/collect.xsl" cannot parse /home/Vicente/SVN/tools/boostbook/xsl/doxygen/collect.xsl intro.qbk: error: Could not open input file. Have other find the same problem? What is going wrong on my configuration? trunk + cygwin Thanks for your help, Vicente ========================= Traces ========================= xslt-xsltproc ../bin.v2/libs/asio/doc/gcc-3.4.4/debug/asio_doc.docbook warning: failed to load external entity "/home/Vicente/SVN/tools/boostbook/xsl/docbook.xsl" cannot parse /home/Vicente/SVN/tools/boostbook/xsl/docbook.xsl XML_CATALOG_FILES=../bin.v2/boostbook_catalog.xml export XML_CATALOG_FILES "C:/cygwin/home/Vicente/boost/quickbook/bin/xsltproc.exe" --stringparam boost.libraries "../../libs/libraries.htm" --stringparam chapter.autolabel "0" --stringparam chunk.first.sections "1" --stringparam chunk.section.depth "8" --stringparam generate.section.toc.level "1" --stringparam generate.toc "chapter nop section nop" --stringparam root.filename "boost_asio" --stringparam toc.max.depth "1" --stringparam toc.section.depth "2" --xinclude -o "../bin.v2/libs/asio/doc/gcc-3.4.4/debug/asio_doc.docbook" "/home/Vicente/SVN/tools/boostbook/xsl/docbook.xsl" "../bin.v2/libs/asio/doc/gcc-3.4.4/debug/asio_doc.xml" ...failed xslt-xsltproc ../bin.v2/libs/asio/doc/gcc-3.4.4/debug/asio_doc.docbook... ...skipped <phtml>asio_HTML.manifest for lack of <p../bin.v2/libs/asio/doc/gcc-3.4.4/debug>asio_doc.docbook... xslt-xsltproc ../bin.v2/libs/accumulators/doc/gcc-3.4.4/debug/accdoc-xml.doxygen warning: failed to load external entity "/home/Vicente/SVN/tools/boostbook/xsl/doxygen/collect.xsl" cannot parse /home/Vicente/SVN/tools/boostbook/xsl/doxygen/collect.xsl XML_CATALOG_FILES=../bin.v2/boostbook_catalog.xml export XML_CATALOG_FILES "C:/cygwin/home/Vicente/boost/quickbook/bin/xsltproc.exe" --stringparam doxygen.xml.path "/home/Vicente/SVN/bin.v2/libs/accumulators/doc/gcc-3.4.4/debug/accdoc-xml" --xinclude -o "../bin.v2/libs/accumulators/doc/gcc-3.4.4/debug/accdoc-xml.doxygen" "/home/Vicente/SVN/tools/boostbook/xsl/doxygen/collect.xsl" "/home/Vicente/SVN/bin.v2/libs/accumulators/doc/gcc-3.4.4/debug/accdoc-xml/index.xml" ... quickbook.quickbook-to-boostbook ../bin.v2/libs/functional/hash/doc/gcc-3.4.4/debug/hash.xml Generating Output File: ../bin.v2/libs/functional/hash/doc/gcc-3.4.4/debug/hash.xml intro.qbk: error: Could not open input file. tutorial.qbk: error: Could not open input file. portability.qbk: error: Could not open input file. disable.qbk: error: Could not open input file. changes.qbk: error: Could not open input file. links.qbk: error: Could not open input file. thanks.qbk: error: Could not open input file. xslt-xsltproc ../bin.v2/libs/interprocess/doc/gcc-3.4.4/debug/autodoc-xml.doxygen warning: failed to load external entity "/home/Vicente/SVN/tools/boostbook/xsl/doxygen/collect.xsl" cannot parse /home/Vicente/SVN/tools/boostbook/xsl/doxygen/collect.xsl XML_CATALOG_FILES=../bin.v2/boostbook_catalog.xml export XML_CATALOG_FILES "C:/cygwin/home/Vicente/boost/quickbook/bin/xsltproc.exe" --stringparam doxygen.xml.path "/home/Vicente/SVN/bin.v2/libs/interprocess/doc/gcc-3.4.4/debug/autodoc-xml" --xinclude -o "../bin.v2/libs/interprocess/doc/gcc-3.4.4/debug/autodoc-xml.doxygen" "/home/Vicente/SVN/tools/boostbook/xsl/doxygen/collect.xsl" "/home/Vicente/SVN/bin.v2/libs/interprocess/doc/gcc-3.4.4/debug/autodoc-xml/index.xml" ...failed xslt-xsltproc ../bin.v2/libs/interprocess/doc/gcc-3.4.4/debug/autodoc-xml.doxygen... Vicente@viboes1 ~/SVN/libs/functional/hash/doc $ ls -l total 73 -rwxrwxrwx 1 Vicente Aucun 52 Nov 3 15:00 CMakeLists.txt -rwxrwxrwx 1 Vicente Aucun 932 May 21 2008 Jamfile.v2 -rwxrwxrwx 1 Vicente Aucun 3000 Nov 11 22:34 changes.qbk -rwxrwxrwx 1 Vicente Aucun 1430 Mar 30 2008 disable.qbk -rwxrwxrwx 1 Vicente Aucun 716 Mar 30 2008 hash.qbk -rwxrwxrwx 1 Vicente Aucun 1832 Mar 30 2008 intro.qbk -rwxrwxrwx 1 Vicente Aucun 1085 Mar 30 2008 links.qbk -rwxrwxrwx 1 Vicente Aucun 3361 Mar 30 2008 portability.qbk -rwxrwxrwx 1 Vicente Aucun 30709 May 21 2008 ref.xml -rwxrwxrwx 1 Vicente Aucun 1257 Mar 30 2008 thanks.qbk -rwxrwxrwx 1 Vicente Aucun 6604 Mar 30 2008 tutorial.qbk $ ls -l /home/Vicente/SVN/tools/boostbook/xsl/doxygen/collect.xsl -rwxrwxrwx 1 Vicente Aucun 2007 Aug 25 06:44 /home/Vicente/SVN/tools/boostbook/x sl/doxygen/collect.xsl $ ls -l /home/Vicente/SVN/tools/boostbook/xsl/docbook.xsl -rwxrwxrwx 1 Vicente Aucun 16566 Nov 11 22:34 /home/Vicente/SVN/tools/boostbook/ xsl/docbook.xsl

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Re: [boost] [unicode] Interest Check / Proof of Concept
by Kasra 20 Nov '08

20 Nov '08

Hi guys, I have been reading this thread with enthusiasm. I like the idea of unicode string class. However, since unicode is rather different from the old fashioned ANSI string literals some interfaces might need to be changed. Maybe what I have to say could help you in one form or the other: \+ typedef std::basic_string<uint32_t> unicode_string; this string class will have all of the normal std::string interface as all of the unicode encoding is mapped within a 32-bit integral type. we could then have a class called encoding; such that it allows for static conversion from unicode_string type to utf8, utf16, etc. for example: \+ unicode_string s = U"Hello Wolrd!"; \+ utf8_string utf8 = encoding::utf32::to_utf8(s); // also we could have a implicit conversion such that utf8 could // perform the conversion from utf32 string I personally like this approach a lot. Since when you think about it the interface does not changed we could still have efficient iterators and insertion, at the same time whenever there is a need for memory compact encoding we convert to the desired encoding as required. So in a sense what I am saying is keep the encoding using utf32 for performance on memory however, when we want to export the encoding (to screen, file and etc) convert to the desired encoding. If there is any interest for this approach drop me a line and I will send you the interface which I have for this. With best regards Kasra

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[function] minor doc issues
by Thorsten Ottosen 20 Nov '08

20 Nov '08

Hi, Reading http://www.boost.org/doc/libs/1_36_0/doc/html/function/reference.html it says: A function object f is compatible if for the given set of argument types Arg1, Arg2, ..., ArgN and a return type ResultType, the appropriate following function is well-formed: // if ResultType is not void ResultType foo(Arg1 arg1, Arg2 arg2, ..., ArgN argN) { return f(arg1, arg2, ..., argN); } // if ResultType is void ResultType foo(Arg1 arg1, Arg2 arg2, ..., ArgN argN) { f(arg1, arg2, ..., argN); } I believe the "If ResultType is void" is not needed. We can return void in C++. -Thorsten

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[Serialization] (and [TypeTraits]?) Overloaded new operator are not called from serialization
by Runar Undheim 20 Nov '08

20 Nov '08

Could someone help to update the serialization code in boost to call the overloaded new operator, please? There already exist some code, but the code is not active because of a #if 0 statement. And if I set the code to #if 1 the code is not compiling with Visual C++ 2005. So I have updated the heap_allocator implementation in archive\detail\iserializer.hpp to support overload of new operator, but I'm not sure if it will work on all compilers. I have just tested the code with Visual C++ 2005. First the code that I used to check if the new operator is overloaded. If there are compilers that don't support the code, the implementation could be updated using defines and only return false. This way we take advantage of the information on supported compilers, an the code will work as before on unsupported compilers. Should the code that check if it has a new operator be part of the Type Traits library? typedef char True; // sizeof(True) == 1 typedef struct { char a[2]; } False; // sizeof(False) > 1 template <class U, U x> struct test; template <typename C> const True *hasNewOperator(C*, test<void *(*)(size_t),&C::operator new>* = NULL) { // Function must be implemented on Visual C++ 2005 to prevent linking error return NULL; } template <typename R> const False *hasNewOperator(...) { // Function must be implemented on Visual C++ 2005 to prevent linking error return NULL; } //#define hasNewOperator(f) (sizeof(*hasNewOperator<f>(static_cast<f*>(NULL))) == sizeof(True)) Then the heap_allocator is updated to use the hasNewOperator: template<class T> struct heap_allocator { template<class U> static T* new_operator(U); static T* new_operator(const True*) { return static_cast<T *>((T::operator new)(sizeof(T))); } static T* new_operator(const False*) { return static_cast<T *>(operator new(sizeof(T))); } static T * invoke(){ return new_operator(hasNewOperator<T>(static_cast<T *>(NULL))); } }; regards, Runar

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Boost and Borland C++ Compiler 5.5
by Marcin Kurek 20 Nov '08

20 Nov '08

Hello everybody, I faced a problem when upgrading a piece of software originally written using Borland C++ Builder 5. Because there are some configuration files I need to parse I thought it might be a good idea to use Boost Regex. However, I've encountered many errors when I tried to build it. I've downloaded 1.37.0 release and followed instructions in "Getting started on Windows": E:\boost_1_37_0\bjam.exe --build-dir E:\boost-build --toolset=borland As result I get multiple errors: "bcc32.exe" -j5 -g255 -q -c -P -Ve -Vx -a8 -b- -O2 -tWC -tWR -tWC -WM- -DBOOST_ALL_NO_LIB=1 -DNDEBUG -I"." -I"C:\Program Files\Borland\CBuilder5/include/" build\borland\release\link-static\copysignf.obj" "libs\math\build\..\src\tr1\copysignf.cpp" ...failed borland.compile.c++ e:\boost-build\boost\bin.v2\libs\math\build\borland\release\link-static\copysignf.obj... borland.compile.c++ e:\boost-build\boost\bin.v2\libs\math\build\borland\release\link-static\erfcf.obj libs\math\build\..\src\tr1\erfcf.cpp: Error E2176 .\boost/math/tr1.hpp 179: Too many types in declaration Error E2176 .\boost/math/tr1.hpp 180: Too many types in declaration Error E2176 .\boost/math/tr1.hpp 181: Too many types in declaration I've downloaded BCC 5.5.1 from Borland, but the effect was the same. I also was trying some older releases of Boost, including 1.32.0 and 1.33.1. E:\boost_1_33_1\bjam.exe -sTOOLS=borland install "bcc32" -j5 -g255 -q -c -P -w -Ve -Vx -a8 -b- -DNDEBUG -DNDEBUG -DBOOST_IOSTREAMS_DYN_LINK=1 -O2 -vi -w-inl -tWR -tWD -WM- -w-8001 -I"bin\boost\libs\iostreams\build" -I"E:\boost_1_33_1" -I"E:\bo ost_1_33_1" -o"bin\boost\libs\iostreams\build\boost_iostreams.dll\borland\release\mapped_file.obj" "E:\boost_1_33_1\libs\iostreams\build\..\src\mapped_file.cpp" (...) borland-C++-action bin\boost\libs\iostreams\build\boost_iostreams.dll\borland\release\threading-multi\mapped_file.obj E:\boost_1_33_1\libs\iostreams\build\..\src\mapped_file.cpp: Error E2401 E:\boost_1_33_1\boost/iostreams/detail/is_iterator_range.hpp 20: Invalid template argument list Error E2303 E:\boost_1_33_1\boost/iostreams/detail/is_iterator_range.hpp 20: Type name expected Error E2238 E:\boost_1_33_1\boost/range/iterator.hpp 102: Multiple declaration for 'range_iterator<char *>' Error E2344 E:\boost_1_33_1\boost/range/iterator.hpp 77: Earlier declaration of 'range_iterator<char *>' Error E2238 E:\boost_1_33_1\boost/range/iterator.hpp 108: Multiple declaration for 'range_iterator<wchar_t *>' Error E2228 E:\boost_1_33_1\boost/range/iterator.hpp 108: Too many error or warning messages I don't have an idea what's wrong. I was googling a lot, but after 6 hours I guess I'll give up for today. Maybe there's something obvious I don't see, could anybody point me in the right direction, please? Thanks a lot, Marcin

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limit symbol names of fusion::vector
by Christian Holmquist 19 Nov '08

19 Nov '08

Hi, I'm using fusion::result_of::as_vector<some_mpl_transform_view>::type quite frequently, but having troubles with extremely long type names (our vc8.pdb are close to 0.5 Gb). Is there any way in fusion like in mpl, where one can do mpl::vector<a, b, c>::type ^^ which gives the shorter name mpl::vector3<a, b, c> instead of mpl::vector<a, b, c, na, na, na, ...> In essence, can I have fusion::vector2<int, float> from the following: fusion::result_of::as_vector<mpl::vector<int, float>::type >::type Thanks for a great lib! / Christian

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BOOST_FOREACH slow?
by Hansi 19 Nov '08

19 Nov '08

Hello, I have made a few tests with the performance of BOOST_FOREACH. The results are for me unexpected slow...may be one has an idea if I make something wrong... vector[int]: index:0.00167619 vector[int]: iterator:0.00167619 vector[int]: BOOST_FOREACH:9.40036 list[int]: iterator:239.669 list[int]: BOOST_FOREACH:233.219 vector[TestData]: index:0.00167619 vector[TestData]: iterator:0.00167619 vector[TestData]: BOOST_FOREACH:9.40008 list[TestData]: iterator:233.827 list[TestData]: BOOST_FOREACH:238.513 testArray[int]: index:0.00167619 testArray[int]: BOOST_FOREACH:9.40008 Best regards Hansjörg the test program was: // ForEach.cpp : Defines the entry point for the console application. // #include "stdafx.h" #include "..\include\PerformanceCounter.h" #include <vector> #include <boost\foreach.hpp> #include <iostream> #include <list> using namespace std; using namespace Microtec; class TestData { public: TestData(int val1, int val2, int val3):var1(val1),var2(val2),var3(val3){} int var1; int var2; int var3; }; int testArray[10000000]; int _tmain(int argc, _TCHAR* argv[]) { vector<int> data; list<int> lstData; vector<TestData> vectorTestData; list<TestData> lstTestData; for(int i = 0; i < 10000000;i++) { data.push_back(i); lstData.push_back(i); vectorTestData.push_back(TestData(i,i,i)); lstTestData.push_back(TestData(i,i,i)); } int res = 0; const int actSize = (int)data.size(); for(int i = 0; i < actSize; i++) { res += data[i]; } //takes 0.0017 ms res = 0; for(vector<int>::iterator it = data.begin(); it != data.end(); it++) { res += *it; } //takes 0.0017 ms res = 0; BOOST_FOREACH(int val,data) { res += val; } //takes 9.400 ms //list res = 0; for(list<int>::iterator it = lstData.begin(); it != lstData.end(); it++) { res += *it; } //takes 239.669 ms res = 0; BOOST_FOREACH(int val,lstData) { res += val; } //takes 233.219 ms //vector TestData for(int i = 0; i < actSize; i++) { res += vectorTestData[i].var1; } //takes 0.0017 ms res = 0; for(vector<TestData>::iterator it = vectorTestData.begin(); it != vectorTestData.end(); it++) { res += it->var1; } //takes 0.0017 ms res = 0; BOOST_FOREACH(TestData& val,vectorTestData) { res += val.var1; } //takes 9.400 ms //list res = 0; for(list<TestData>::iterator it = lstTestData.begin(); it != lstTestData.end(); it++) { res += it->var1; } //takes 233.827 ms res = 0; BOOST_FOREACH(TestData& val,lstTestData) { res += val.var1; } //takes 238.827 ms for(int i = 0; i < actSize; i++) { res += testArray[i]; } //takes 0.0017 ms res = 0; BOOST_FOREACH(int val,testArray) { res += val; } //takes 9.400 ms return 0; }

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